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131 Acute Kidney Injury
453
• Postrenal: obstruction. In surgical patients, this is often related to a kinked or clogged Foley catheter but may also be a result of an enlarged prostate, obstructing renal stone, or injury to the ureter.
Management ofAKI
The optimal management strategy for AKI is the identica­tion of at-risk patients and preventively managing their care to minimize the risk of developing AKI.The goal is to main­tain euvolemia and normotension and avoid nephrotoxic drugs throughout their clinical course. Resuscitation with balanced crystalloid solutions, which are more similar to human plasma with respect to electrolytes, pH, and buffer capacity, is preferred. Once AKI has developed, there is no specic treatment to regain kidney function. The goal is to maintain adequate renal perfusion and to avoid further kid­ney injury, allowing the return of renal function. Supportive care, optimizing volume status, and time will dictate the clinical course. Conversion of oliguric to non-oliguric renal failure with use of diuretics will not alter the course but may help manage volume status and avoid the need for renal replacement therapy (RRT).
RRT is indicated for the management of profound acido-
sis, electrolyte derangements such as refractory hyperkale­mia, ingestion of certain intoxicants, volume overload, and severe uremia. Initiation of RRT is a marker of signicant morbidity in the postsurgical patient; however, if indicated, it should certainly be utilized. Early versus late initiation of RRT remains a source of debate as to its effect on ultimate outcomes. The mode of RRT employed should be tailored to the indication for dialysis therapy and the patient’s overall physiology including ability to tolerate volume removal.
Additionally, while urine output is a great marker of resusci­tation, osmotic diuresis such as in hyperglycemia may be misleading, and despite high urine output, a patient may still develop an AKI. Non-oliguria or post-obstructive diuresis may still present with acute kidney injury.

Clean Kills

• Failure to recognize and return to the operating room for a patient whose AKI is caused by a surgical complication (e.g., postoperative bleeding or anastomotic leak)
• Failure to identify the need for renal replacement therapy, such as refractory hyperkalemia, volume overload, or severe uremia
Words ofWisdom
As with any postoperative complication, always think about the index operation and what operative factors could be caus­ing the complication being observed. Develop a thoughtful approach to the problem with a focused differential diagno­sis. Avoid an absolute shotgun approach for every possible cause of AKI, but truly think about the question stem and real patient and operative factors that could be causing the AKI, and then adjust your therapies to match. Lastly, your nephrol­ogy colleagues will be available to run the dialysis machine should it be necessary (you do not need to know how to write dialysis orders), but the initial workup of a patient with oli­guria and/or AKI and determination of whether dialysis is acutely indicated should be fair game.

Bibliography

Bonus Points

Remember that creatinine can uctuate with age, muscle mass, and diet. It is important to know the patient’s baseline as even a normal number may be abnormal for the patient.
SCORE. https://surgicalcore.org. Townsend CM.Sabiston textbook of surgery: the biological basis of
modern surgical practice. 21st ed. Elsevier; 2021.

Intraoperative Complications: Hemorrhage

WissamNasser andAlecBeekley
132
Way Question May BeAsked?
A 67-year-old male with a history of degenerative disc dis­ease was undergoing anterior lumbar decompression/fusion of the L4–S1 vertebrae requiring anterior exposure by gen­eral surgery. The patient did not have a history of abdominal surgery; therefore a Pfannenstiel incision was used. An extraperitoneal approach was utilized by a general surgeon for exposure of the spine. During the dissection, a sudden rush of high volume dark bleeding was encountered.
How toAnswer?

Surgical Management

• Identifying the source of the bleed and applying direct
pressure if possible
• Communication:
– Promptly alert anesthesia of the injury and maintain
consistent two lines of communication throughout.
– Call for assistance from another surgeon (intraopera-
tive vascular surgery consult).
– Circulating nurses maintain a clear and concise record
of blood products used and communicate with the blood bank for any supplies needed.
• Extending the laparotomy incision for better control of
the injury and access for repair
• Resuscitation:
– Labs (including coagulation parameters), type and
screen
– Initiating massive transfusion protocol (MTP)
Transfuse blood products with goals of (hemoglo­bin <7, platelet count <50K, INR <1.5)
W. Nasser · A. Beekley (*) Department of Surgery, Thomas Jefferson University Hospital, Philadelphia, PA, USA e-mail: Wissam.Nasser@jefferson.edu; Alec.Beekley@jefferson.edu
• Admission to higher level of care such as the ICU for close hemodynamic monitoring

Common Curveballs

• Massive hemorrhage can result in coagulopathy and shock (Graling etal. 2014).
• Massive transfusion and uid resuscitation due to periop­erative bleeding can lead to acquired coagulation abnor­malities such as hemodilution, hemostatic factor consumption, coagulopathy, hypothermia (especially if uids are not warmed), and electrolyte imbalances (Ghadimi etal. 2016).
• Recognizing the development of coagulopathy and hypo­thermia and converting to a damage control procedure.

Clean Kills

• Not establishing communication and updating anesthesia and OR staff
• Not calling for help despite unsuccessful control of bleeding
• Not converting to a laparotomy during a laparoscopic pro­cedure if bleeding is not controlled
• Not initiating massive transfusion protocol

Bonus Points

• Denition of massive hemorrhage (Irita 2011):
– Blood loss exceeding circulating blood volume within
a 24-h period
– Blood loss of 50% of circulating blood volume within
a 3-h period – Blood loss exceeding 150 ml/min – Blood loss that necessitates plasma and platelet
transfusion
© The Author(s), under exclusive license to Springer Nature Switzerland AG 2025 M. Neff et al. (eds.), Passing the General Surgery Oral Board Exam, https://doi.org/10.1007/978-3-031-78244-2_132
455
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W. Nasser and A. Beekley
• When blood type is unclear, or type and screen has not resulted, O-type RBCs should be used when able (Irita
2011).
Words ofWisdom
• Unexpected intraoperative hemorrhage, particularly dur­ing elective surgery, can be mentally and emotionally tax­ing for surgeons to deal with. Help should always be requested. Establishing a “safety net” around the patient by clear communication with anesthesia team, operating room staff, establishment of resuscitation lines, notica­tion of the transfusions services, and early calls for intra-
operative assistance can make the difference in obtaining successful rescue of the patient.

Bibliography

Graling P, Dort J, Moynihan J. Crisis management of a hemorrhagic
emergency in the OR. AORN J. 2014;99(4):510–6. https://doi.
org/10.1016/j.aorn.2014.02.008.
Ghadimi K, Levy JH, Welsby IJ. Perioperative management of the
bleeding patient. Br J Anaesth. 2016;117(Suppl. 3):iii18–30. https://
doi.org/10.1093/bja/aew358.
Irita K. Risk and crisis management in intraoperative hemorrhage:
human factors in hemorrhagic critical events. Korean J Anesthesiol. 2011;60(3):151–60. https://doi.org/10.4097/kjae.2011.60.3.151.

Trocar Injury

SageA.Vincent
133
Way Question May BeAsked?
Scenario 1
A 55-year-old male who is healthy, with no past medical his­tory, presents for evaluation of bilateral groin discomfort and bulges. He is found to have bilateral inguinal hernias. He desires robotic bilateral inguinal hernia repair. You coun­sel the patient about the risks of surgery, including damage to internal structures during trocar placement. What are the different options for abdominal entry for laparoscopic surgery?
How toAnswer?
• Open, cutdown with Hasson port entry under direct visualization
– Ideal for patients with prior surgery – Often allows immediate identication and repair if a
visceral injury is made
• Veress needle insertion to establish pneumoperitoneum
– Inserted perpendicular to the skin, can conrm intra-
peritoneal location using a saline drop test
• Direct trocar insertion or blind insertion without pneumoperitoneum
– Minimizes number of blind steps with Veress tech-
nique (i.e., needle placement, insufation, trocar placement) to just one—trocar placement
The above patient presents on the day of surgery. You elect
to enter the abdomen using direct trocar insertion without pneumoperitoneum, just superior to the umbilicus. Once the port is in place, you introduce the camera and notice food products emanating from a small enterotomy. How should you proceed?
How toAnswer?
• Perform an inspection of the abdominal cavity to ensure no additional injuries and then repair the injury. This can be done laparoscopically or open depending on surgeon preference and visualization.
• If there is concern for contamination of the peritoneal cavity, do not place synthetic mesh.
Scenario 2
The same 55-year-old male presents for his elective bilateral inguinal hernia repair. You perform blind trocar placement for abdominal entry. The abdomen shows no evidence of injury on camera introduction. You perform your bilateral inguinal hernia without issue and he is discharged home from the PACU.On postoperative day 2, he returns to the emergency room with abdominal pain and fever to
101.8°F.He has a leukocytosis and computed tomography of
the abdomen and pelvis with IV contrast shows free uid in the pelvis and moderate pneumoperitoneum. On exam, he is peritonitic, demonstrating rebound tenderness and guard­ing. How should you proceed?
How toAnswer?
• Given concern for a missed injury during the initial hernia repair, operative exploration is warranted. This can be done laparoscopically or robotically, but surgeons should not hesitate to perform formal laparotomy if necessary.
– Note: About 30–50% of all visceral injuries related to
trocar injury will not be identied at the time of sur­gery (Krishnakumar and Tambe 2009). Index of suspi­cion should be high in any patient returning to the ED.
How could you have avoided this small bowel injury?
S. A. Vincent (*) Department of Surgery, Thomas Jefferson University Hospital, Philadelphia, PA, USA e-mail: Sage.vincent@jefferson.edu
© The Author(s), under exclusive license to Springer Nature Switzerland AG 2025 M. Neff et al. (eds.), Passing the General Surgery Oral Board Exam, https://doi.org/10.1007/978-3-031-78244-2_133
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S. A. Vincent
How toAnswer?
• There is no consensus regarding the best modality of abdominal entry for laparoscopy; however many feel that direct visualization with a cutdown and Hasson entry is safest. If utilizing Veress needle entry, it is important to monitor the initial abdominal pressures on insufation. Pressures > 10 mmHg indicate malposition.
Scenario 3
A 68-year-old female with a history of COPD and BMI of 18 presents to the ED with right lower quadrant pain and is found to have acute appendicitis. She is taken to the OR for a laparoscopic appendectomy. Hasson port placement is performed at the umbilicus. An additional port is placed suprapubic and a third in the left lower quadrant. The case is completed without incident. At the completion of the case, the left lower quadrant port is removed and there is immediate pulsatile bleeding from the anterior abdominal wall. What vessel has been injured and how will you deal with it?
How toAnswer?
• This is most likely an injury to the inferior epigastric ves­sels. The injury occurred during trocar placement but was under tamponade by the port, with bleeding noticeable after its removal at the completion of the case.
• Abdominal wall port site bleeding can be stopped with direct pressure or electrocauterization (externally or with energy devices introduced internally through another port), for passage of transabdominal suture with a suture passing device. Hemostatic agents can also be applied if necessary. Postoperatively, it is important to monitor these hematomas to ensure they do not continue to expand.
• Key Point: Use transillumination on the anterior abdomi- nal wall to visualize the epigastric vessels to ensure a tro­car is not placed through one. Always remove ports under direct visualization.
Scenario 4
The above patient is in the operating room and is positioned supine with left arm tucked to undergo laparoscopic appen­dectomy. Direct trocar placement without pneumoperito­neum is performed at the umbilicus. The abdomen is insufated and the camera is introduced. The visualization is poor with a large volume of blood in the abdomen. The anes­thesia team tells you that she is becoming tachycardic and hypotensive. How should you proceed?
How toAnswer?
• If the site of bleeding is obvious, hold pressure.
• Communicate clearly and effectively with everyone in the room, letting them know that you are concerned about a major vascular injury. Massive transfusion protocols can be activated by anesthesia. Open surgical equipment should be available to perform a laparotomy. Identify the source of bleeding and obtain proximal and distal control. Call vascular surgery colleagues if available.
– Hint: Follow penetrating trauma protocols with regard
to operative exploration and management including damage control surgery.
Scenario 5
A 62-year-old male with a previous history of a gunshot wound requiring an exploratory laparotomy and splenec­tomy in the distant past presents with a small bowel obstruc­tion. Despite several days of conservative management, he has not had return of bowel function and he is taken to the operating room for a diagnostic laparoscopy. Given his pre­vious splenectomy, the decision is made to place a Veress needle in the right upper quadrant to avoid adhesions. The Veress is placed and insufation is started. Your anesthesia colleagues report there is an immediate drop in the end-tidal CO2 with associated hemodynamic instability. What has hap­pened and how will you proceed?
How toAnswer?
• This patient has a CO2 air embolism, likely due to Veress placement in the liver, which introduced the CO2 insufa­tion into the circulation.
• The insufation should be disconnected. FiO2 should be increased to 100%. Laparoscopic instruments should be removed. The patient should be positioned Trendelenburg in the left lateral decubitus position, which will allow the air bubble to rise to the apex of the right atrium and ven­tricle. If a central line is in place, aspiration of the CO bubble can be attempted. Resuscitation with uids should be initiated with supplemental vasopressors as needed to maintain adequate blood pressure (please see chapter on Air Embolism for more details).
air
2

Bonus Points

• Palmer’s point, located 3 cm below the costal margin in the midclavicular line, is generally felt to be a safe site of abdominal entry, particularly for Veress needle placement.
133 Trocar Injury
459

Clean Kills

• Failure to convert to laparotomy in the setting of hemody­namic instability from bleeding related to trocar injury or inability to identify the site of bowel injury
Words ofWisdom
Minimally invasive surgery continues to become a corner­stone of surgical management of many pathologies. There have been many improvements made in minimally invasive surgery since its primitive introduction in the early 1900s (Schlogel 1996) including high-denition visualization, defogging technology, and wristed instrumentation with robotics. As the culture of surgical practice shifts toward minimally invasive technologies, it is important to be aware of the specic risks these procedures carry, as well as steps to mitigate those risks.
One of the feared risks of minimally invasive surgery is
trocar injury. Trocar injury occurs on entry to the abdomen, typically with the rst trocar placement. These represent a class of injuries with signicant associated morbidity and mortality. Retrospective studies report an estimated inci­dence of trocar injury to be around 0.1–1% of all laparo­scopic cases (Scafer etal. 2001; Orlando etal. 2003; Maskal etal. 2023). Bowel injury, accounting for 70% of all trocar
injuries (Maskal etal. 2023), is associated with high morbid­ity, particularly when its identication is delayed. Vascular trocar injuries, though less frequent, are extremely detrimen­tal, with a mortality rate approaching 15% (Krishnakumar and Tambe 2009). Due to the close proximity of the abdomi­nal wall to the retroperitoneal vasculature, these injuries are more frequently seen in petite patients or patients with lower body mass index. No matter how experienced you are, these happen. There is no perfect method of entry, and the best technique is whatever is best in your hands. Be very careful in thin patients, patients with enlarged organs, prior surgery, and post-bariatric surgery patients.

Bibliography

Krishnakumar S, Tambe P.Entry complications in laparoscopic surgery.
J Gynecol Endosc Surg. 2009;1(1):4–11.
Maskal S, Ellis R, Prabhu A, Miller B, Beffa L, Krpata D, Rosen
M, Petro C. Injuries incurred from minimally invasive access for abdominal surgery. Surg Endosc. 2023;37(7):5368–73.
Orlando R, Palantini P, Lirussi F.Needle and trocar injuries in diag-
nostic laparoscopy under local anesthesia: what is the true inci­dence of these complications? J Laparoendosc Adv Surg Tech A. 2003;13(3):181–4.
Scafer M, Lauper M, Krahenbul L.Trocar and Veress needle injuries
during laparoscopy. Surg Endosc. 2001;15:275–80.
Schlogel G.Raoul Palmer and the coelio-surgical adventure from 1940
to 1995. Hist Sci Med. 1996;30(2):281–7.
Surgery inthePregnant Patient
EmilyIsch
134
Way Question May BeAsked?
You are called to see a 25-year-old pregnant female in the emergency department with right lower quadrant abdominal pain. Walk me through your diagnostic workup and evaluation.
How toAnswer
• Start with a complete history and physical examination, with particular consideration of the following:
• History
– Duration, severity, associated symptoms. – Date of last menses. – Sexual history (sexually active?), any use of birth con-
trol currently. – Vaginal bleeding. – In the third trimester, the initial history should include
an assessment for a history of hypertension, fetal
movement, visual changes, headache, leakage of uid
from the vagina, and whether the pain waxes and
wanes (this may represent contractions).
• Physical exam – “Toxic” appearance, shock, acidosis, leukocytosis – Presence of peritonitis – Tachycardia/hypotension – Hypertension (concern for preeclampsia)
• Diagnostic tests – Complete blood count. – Abdominal ultrasound. – Urine HCG. – Fetal ultrasound to determine viability if any concern.
E. Isch (*) Department of Surgery, Thomas Jefferson University Hospital, Philadelphia, PA, USA e-mail: Emily.isch@jefferson.edu
– If concerned for preeclampsia, perform fetal monitor-
ing, a complete blood count, a comprehensive meta­bolic panel, and a urine protein-creatinine ratio.
• In this situation, if the patient is found to have acute appendicitis, one should be taken to the operating room for denitive surgical management.

Surgical Management

• Important considerations in the pregnant patient:
– Preoperative preparation: Consider obstetric causes of
abdominal pain: placental abruption, preeclampsia, and preterm labor.
– Location of appendix will be affected/displaced by
enlarged uterus depending on trimester of pregnancy.
– One should discuss risks and benets of surgery in
pregnant patient.
Appendicitis is the most common complication in pregnant women (1/1700 pregnancies). Acute cholecystitis affects 1/1000 pregnant women.
– Physiologic changes in pregnant patient: increased
heart rate, increased stroke volume, decreased vascular resistance, and decreased mean arterial pressure.
– Abdominal imaging should be done with ultrasound as
safest initial imaging modality.
– Anesthetic considerations: surgery during the rst tri-
mester is typically avoided given historic knowledge of teratogenic effects of anesthesia. A single exposure is safe without increased risk of major birth defects.
General anesthesia in the third trimester is less stud­ied but is acceptable, though there is a higher risk for preterm labor and abdominal organs are less accessible because of the gravid uterus. Conrm fetal heart tones pre- and postoperatively in patient >24 weeks’ gestation.
– Per SCORE, laparoscopic treatment of acute abdomi-
nal disease has the same indications in pregnant and nonpregnant patients. Surgery should “not” be with-
© The Author(s), under exclusive license to Springer Nature Switzerland AG 2025 M. Neff et al. (eds.), Passing the General Surgery Oral Board Exam, https://doi.org/10.1007/978-3-031-78244-2_134
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E. Isch
held from a pregnant woman if nonsurgical manage­ment could jeopardize the health of the mother.
– Laparoscopic entry should be with Hasson technique
or optical entry in the Left upper quadrant.
• Pregnant trauma patient’s uterus is shielded by the pelvis for rst 12 weeks of gestation; the uterus reaches the level of the umbilicus by 20 weeks and then rises 1 cm per week on average.
– Increased vulnerability of fetus, but bowel becomes
more protected by ribs
Way Question May Be Asked (Alternative Scenario)?
Your 25-year-old female patient has a normal appendix ultrasound but is found to have fetal heart rate that is persis­tently out of the range of normal (110–160 beats per minute). What is the next step in your treatment plan?
How toAnswer?
• Initial management includes placing the patient in the left lateral decubitus position and administration of crystal­loid and supplemental oxygen. In absence of responsive fetal heart rate, emergency cesarean section should be considered.

Common Curveballs

• Thyroid disease:
– One cannot use radioactive iodine 131in thyroid dis-
ease; one should recommend surgery instead.
– Propylthiouracil (PTU) instead of methimazole for
thyroid disease in pregnant patients.
• Insulinoma: early pregnancy can be mistaken for this syn­drome (in presence of hypoglycemia).
• Hemorrhoids: consider managing this diagnosis non-operatively.
• Breast cancer: cannot receive external beam radiation therapy, sentinel lymph node biopsy, or antimetabolite­based chemotherapy until patient delivers. It is generally considered acceptable to usually treat until after delivery.
– Do not perform therapeutic abortion to allow for treat-
ment of breast cancer.
– Bloody nipple discharge during third trimester can be
normal.
• Imaging: acceptable to perform CT scan in patient in emergency situation, particularly after 20 weeks (once organogenesis is complete—after 20 week’s gestation).
• MRI scan without gadolinium is an option in the second trimester of pregnancy. This is typically not recommended
during the rst trimester because of the theoretical risk of local generation of heat due to the high-frequency cur­rents induced by radiofrequency elds.

Clean Kills

• Failure to obtain urine HCG prior to surgery
• Failure to obtain urine HCG on trauma patient
• Administration of methimazole in pregnant patient
• Utilization of radioactive iodine in pregnant patient
• Surgical management of hemorrhoids in pregnant patient
• Performance of external beam radiation therapy for the management of breast cancer in pregnant patient
• Administration of antimetabolite chemotherapy on preg­nant patient
• Failure to operate on peritonitis in setting of pregnancy
• Failure to obtain domestic violence screening in pregnant trauma patient

Bonus Points

• Performance of Kleihauer-Betke test in all patients who are Rh-negative and Rh-positive and who sustain blunt injury.
• Fetal FAST in trauma patient (number of fetuses and their position, placental location, amniotic uid volume, fetal cardiac activity, femur length).
• Domestic violence is the most common cause of trauma in pregnant patients—8307 of 100,000 live births.
• Maternal positioning intraoperatively: elevate right side to avoid compression of the vena cava.
• Perimortem cesarean section must be performed within 5min of maternal demise.
Words ofWisdom
Generally speaking, in pregnant patients with surgical prob­lems, appropriate surgical treatment of inammatory condi­tions of the abdomen is the best course to maintain fetal well-being. Do not let the examiners lead one into nonopera­tive management of straightforward surgical problems in such patients.

Bibliography

Score. Available at: https://www.surgicalcore.org/modulecontent.
aspx?id=1000476.
Part XVIII
Skin and Soft Issue

Melanoma (Thin)

CandaceL.Ward andElenaPaulusLamb
135
Way Question May BeAsked?
“A 57-year-old male presents to your ofce after a referral from his primary care physician for a skin lesion on his right shoulder. He is a nonsmoker and fair-skinned. He has no past medical history and is an avid surfer. He has never had skin lesions before and has no relevant family history.”
How toAnswer
• Complete history and physical: – History:
How long has this skin lesion been present? Has it changed? Bleeding, ulceration, or itching of lesion? History of immunosuppression or excessive sun exposure. Swelling of lymph node basins, including the axilla, inguinal, cervical, etc.
– Physical exam:
Complete skin exam—evaluate lesion for ABCDEs (asymmetry, border, color, diameter, evolving) Complete lymph node exam
– Diagnostic tests:
Usual labs (CBC, BMP, LFTs—likely to be unremarkable). Full-thickness biopsy. Once pathology is positive, will need to know thick­ness of the lesion (Breslow depth of invasion) and presence or absence of ulceration.
• Dermal mitotic rate is useful for prognosis but not necessary for treatment/staging.
If the nodal exam is equivocal, consider a nodal basin ultrasound.
C. L. Ward (*) · E. P. Lamb Department of Surgery, Jefferson Einstein Medical Center, Philadelphia, PA, USA e-mail: Elena.Lamb@jefferson.edu
Further imaging indicated for stage III/IV disease— PET/CT, brain MRI for patients with neurologic symptoms or distant metastases.
• Considerations prior to surgical intervention for thin melanoma:
– Staging:
T stage: “thin” melanoma is ≤1mm in thickness.
• T1a is <0.8 mm without ulceration or high mitotic rate.
• T1b is either <0.8 mm with ulceration or
0.8–1.0mm with or without ulceration.
• No sentinel node biopsy (SLNB): clinical stage IA, T1a melanoma without other adverse features.
• Consider SLNB if clinical stage IB, T1b mela­noma, or T1a lesions >0.5 mm with other adverse features. It is worthwhile to present these at a tumor board for discussion.
N stage:
• Perform preoperative lymphoscintigraphy and intraoperative intradermal isosulfan blue dye injection.
• Nodal status correlates best with survival.
• Perform SLNB at same procedure as wide local excision if able.
M stage: imaging preoperatively based on physical exam and history. Provide an educated determination of stage:
• Patients with in situ melanoma are stage 0.
• Those with invasive melanoma and clinically negative lymph nodes are stage I–II.
– Stage I: <1mm thick with (stage IB) or with-
out (IA) ulceration and mitotic rate 0/mm
– Stage II: >1-mm-thick lesion with any fea-
tures and clinically negative nodes
Exception: T2a without ulceration (1.0–2.0 mm) is stage IB.
• Patients with palpable lymph nodes, in-transit disease, or microsatellites are stage III.
– Positive sentinel lymph nodes upstage mela-
noma to stage III at minimum.
2
© The Author(s), under exclusive license to Springer Nature Switzerland AG 2025 M. Neff et al. (eds.), Passing the General Surgery Oral Board Exam, https://doi.org/10.1007/978-3-031-78244-2_135
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