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9 Midline Cervical Swellings
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Fig. 9.6 (a) Thyroglossal cyst with the tongue in place. (b) The cyst with the tongue protruded. Note the upward move- ment of the cyst
Fig. 9.7 (a) Thyroglossal cyst with the tongue in place. (b) The cyst with the tongue protruded. Note the upward move- ment of the cyst. The cyst is large enough to mimic a goiter
that is dumb-bell-shaped lesion. It uctuates eas­ily; however, few are not, being so tense. Many are opaque due to desquamated epithelial cells or debris of previous infection, few are illuminant and many are too small to illuminate [2, 9597]. A thyroglossal cyst is not attached to the skin and local LNs should not be enlarged, unless the cyst is secondarily infected.
present in the cyst might lead to goiter manifesta­tions. However, the most serious complication is the development of carcinoma.
Thyroglossal carcinoma has no sex predomi­nance, with a peak incidence in the fourth decade in females and in the sixth decade in males. Such tumors are very rare and are most commonly papillary thyroid carcinoma (PTC), followed (equally) by mixed papillary–follicular and squa­mous cell carcinoma. Adenocarcinoma was also
9.9.6 Complications
reported. Pure follicular and anaplastic carcino­mas are extremely rare. Medullary thyroid cancer
Complications include infection, which is inevi­table, as the lymphatic tissues in its wall commu­nicate with the neck LNs. Ectopic thyroid tissue
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has never been reported. Their pathogenesis is debatable, some presume they are metastasis from occult PTC; however, most authors suggest
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there are de-novo neoplasms. Thyroglossal cyst carcinoma should be suspected whenever the cyst grows rapidly, when the US demonstrates a com­plex anechoic pattern, or in the presence of calci­cations. Still, they are treated by Sis trunk operation with low recurrence rates. This may be followed by thyroxin suppression therapy and regular measurements of thyroglobulin, which becomes undetectable if successful removal of the carcinoma was achieved and as long as TSH is adequately suppressed by thyroxin [1, 95].
9.9.7 Dierential Diagnosis
A thyroglossal cyst should be differentiated from swellings in the midline of the neck, namely dermoid cyst, sebaceous cyst, lipoma, enlarged LN, laryngocele, ranula, ectopic thyroid tissue, hypertrophied thyroid pyramidal lobe, and cho­ristoma (mass of normal tissues found in abnor­mal locations). Imaging studies could be equivocal. Close attention to the age at presenta­tion, location of the lesion, relation to surround­ing structures, and internal architecture can direct the clinician to the correct diagnosis.
9.9.8 Evaluation
If serum thyroid function test results are abnormal, thyroid scanning should be performed to determine the amount of thyroid tissue in the neck. Some investigators advocate routine US or nuclear scanning to avoid permanent hypothy­roidism [100].
9.9.8.1 Ultrasonography (US)
Ultrasound of the neck will show a thyroglossal cyst as a well-circumscribed anechoic to hypoechoic structure with posterior through transmission [99]; there may be some internal debris (Fig.9.8).
9.9.8.2 Computed Tomography
(CT)Scan
A thyroglossal cyst appears on CT scan as a smooth, thin-walled hypo-attenuating mass in close relation to the hyoid bone (Fig. 9.9) [101103].
9.9.8.3 Magnetic Resonance Imaging
(MRI)
On MRI, a thyroglossal cyst will be high signal on T2-weighted images, and low to intermediate signal on T1-weighted images, depending on the degree of proteinaceous or hemorrhagic contents [102].
Although benign midline neck swellings such as thyroglossal duct cysts are often diagnosed clini­cally, the clinical presentation of infected cysts, thyroglossal duct carcinoma, or other pathologi­cal lesions may be indistinguishable, necessitat­ing diagnostic imaging. In patients with low clinical suspicion of neoplasm, imaging evalua­tion may begin with ultrasonography (US). In the presence of high clinical suspicion of tumor or atypical US features such as solid component or abnormal vascularity, CT scan or MRI is recom­mended to document an orthotopic thyroid gland and to assess the anatomical extent and complica­tions of the cyst, as well as pretreatment planning [98]. In selected cases, diffusion-weighted or dynamic contrast-enhanced MRI can be per­formed for evaluation of vascular malformations, abscess, or suspicious cervical lymph nodes [99].
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Fig. 9.8 Ultrasound image (longitudinal) demonstrating a well-circumscribed hypoechoic cyst containing tiny hyper-echoic foci (debris)
9 Midline Cervical Swellings
Fig. 9.9 Computed tomography (CT) scan showing a midline cystic mass (arrow) immediately below the hyoid bone
9.9.9 Treatment
9.9.9.1 Sistrunk Operation
Patients with thyroglossal cyst may have various problems such as cosmetic concerns, difculty in breathing, pain, swelling, neck discomfort, and dysphasia. Therefore, surgery has been consid­ered the treatment of choice in this condition [104106] and the procedure of choice is the “Sistrunk operation,” which was introduced in 1920 by Sistrunk [107]. It is performed through a transverse incision over the cyst and involves complete excision of the cyst, its tract, and the central portion of the hyoid bone. If necessary, excision extends to the base of the tongue [93, 94,
96, 97, 100].
Prior to excision, an imaging study is per­formed to identify functioning thyroid gland in the lower neck. This ensures that the cyst does not contain the only functioning thyroid tissue in the patient, if any. The recurrence rate could be decreased signicantly after Sistrunk proce­dure (1–5%) [104, 106, 108] as compared to simple cyst excision (40–65%) [104106,
109112].
Gioacchini etal. (2015) reported that in their meta-analysis study that included 24 articles, comprising a total of 1371 subjects, the mean local wound infection rate was 4% (range, 3–6%), this being the most frequent complication follow­ing treatment [113].
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Incomplete excision of the cyst leads to recur­rence, and a recurrent lesion is more liable to recur again. Factors predictive of recurrence included more than two infections prior to sur­gery, age below 2 years, and inadequate initial operation. Failure to remove the central part of the hyoid bone results in recurrence in three out of four patients [93, 94, 96, 97]. In the meta­analysis by Gioacchini et al., the mean overall recurrence rate was 11% (range 9–14%) [113].
9.9.9.2 Percutaneous Ethanol Ablation
(PEA)
Although surgery is the treatment of choice of treatment of a thyro-glossal cyst, it still has some drawbacks such as the use of general anesthesia, scars, and surgical morbidity [97, 104, 106, 108,
111, 112]. Thus, minimally invasive treatment
modalities have been introduced to avoid surgical risk or morbidity. Ethanol ablation (EA) has been reported to be effective, easy, and safe for the treatment of cystic thyroid lesions [114118]. Fewer studies on thyro-glossal cysts reported that successful treatment was achieved with PEA in 60% of cases [119, 120].
9.10 Aortic Arch Aneurysm (AAA)
9.10.1 Denition
A true aneurysm is dened as a “pathological dilation of a segment of a blood vessel involving all three layers of the vessel wall and having at least a 50% increase in diameter compared with the expected normal diameter of the artery” [121]. Aortic arch aneurysms (AAAs) include any thoracic aneurysm that involves the brachio­cephalic vessels [122, 123].
9.10.2 Epidemiology
Thoracic aortic aneurysms (TAAs) have an esti­mated incidence of approximately 10 cases/100,000 persons/year. AAAs account for about 10% of the total cases of TAAs [123, 124]. Males are 2–4 times more commonly affected
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than females, with the majority of patients in the sixth and seventh decades of life [125].
9.10.3 Etiology
Atherosclerosis is the predominant etiology for an isolated AAA. The causes include Marfan syndrome, Loeys–Dietz syndrome, Ehlers– Danlos syndrome, Turner syndrome, familial TAA syndrome, and Behcet disease [126]. Deceleration injuries have been seen to cause dilation of the segment just after the aortic arch [121, 127].
Both infectious and noninfectious inamma­tory conditions of the aorta (aortitis) can also result in TAA.These include syphilis, giant cell arteritis, and Takayasu arteritis [127]. Along with the risk factors of atherosclerosis such as smok­ing, hypertension, and hyper-cholesterolemia, factors that increase aortic wall stress, including pheochromocytoma, cocaine use, and weight­lifting also increase the likelihood of develop­ment of TAA [125].
dentally on imaging ordered for other indications. Vague chest discomfort, neck, and jaw pain may occur with aneurysms involving the arch. A large-sized aneurysm can impinge upon the adja­cent anatomical structures and exert a local mass effect including hoarseness, from left RLN stretching; stridor, from tracheal or bronchial compression; cough, dyspnea, and recurrent pneumonitis, from lung compression; dysphagia, from esophageal compression; and plethora and edema, from compression of the SVC [122].
Aortic arch aneurysms can lead to life­threatening cardiovascular and neurological com­plications, including aortic rupture presenting as severe chest pain and hypotension or shock, aortic dissection, and athero-embolism causing isch­emic strokes. Some rare complications such as aorto-esophageal or aorto-bronchial stula have also been documented [129]. Embolization dur­ing the placement of the graft leading to stroke or spinal ischemia from obstruction of spinal arter­ies, endo-leaks, and hematoma formation are also some of the concerning perioperative complica­tions associated with the aortic repair [130].
9.10.4 Histopathology
Histopathology of aortic aneurysm described as cystic medial degeneration is characterized by disintegration and loss of elastic bers with an increase in the deposition of proteoglycans. Loss of smooth muscle cells in tunica media is typi­cally seen [121, 123]. Increased penetration of vasa vasorum into the medial layer was reported. As atherosclerosis has been found commonly in relation to the AAA, histological data also depicts the presence of atheroma or bro-fatty plaque in the lesion. However, these changes have been seen super-imposed on the degenerative medical disease [128].
9.10.5 Clinical Presentation
Most patients with an AAA are asymptomatic or directly present with life-threatening complica­tions. Aneurysms are typically discovered inci-
9.10.6 Investigations
Computed tomography angiography (CTA) or magnetic resonance angiography (MRA) is the imaging modality of choice for accurate detection and measurement of TAA.It is preferred to delin­eate aortic anatomy, size, branch artery involve­ment, and to rule out other differentials [122].
Echocardiography can also be used to visual­ize the aorta and its major branches; the supra­sternal view is best for viewing the aortic arch [131]. Coronary angiography and echocardiogra­phy are also performed as part of usual preopera­tive investigations done in order to determine the need for a concomitant cardiac procedure. In addition, as maintaining brain perfusion is criti­cal while performing surgeries involving the aor­tic arch, carotid duplex scanning is also routinely instituted in order to access for carotid stenosis [125]. If TAA is detected, it is recommended to image the abdominal aorta to screen for an abdominal aortic aneurysm.
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9.10.7 Dierential Diagnosis
Other aortic arch conditions causing dilation of the vessel segment, including pseudo-aneurysm, intra-mural hematoma, and aortic dissection, can manifest with similar symptoms to those of aortic arch aneurysm. Pseudo-aneurysms usually develop secondary to deceleration injury or tor­sional trauma from accidents and falls. The chest pain from aortic dissection is usually very severe and described as tearing and sharp in nature [122].
9.10.8 Management
9.10.8.1 Medical Treatment
The primary step in the management of AAA is to control the risk factors of atherosclero­sis, to slow the rate of expansion, and to lower the likelihood of development of the complications, including dissection or rup­ture [132, 133]. Stringent control of hyper­tension, optimization of the lipid profile, smoking cessation, and other atherosclerosis risk-reduction measures should be imple­mented [132, 133].
Other important conservative treatment strategies include (1) patient education regard­ing the signs and symptoms indicating the development of complications, (2) serial imag­ing of aneurysm to evaluate for expansion, (3) screening for aneurysms at other locations, and (4) counseling for those suspected of having an associated genetic disorder. It is reasonable to re-image using CT scan or MRI at 12-month intervals for isolated AAAs <4cm in diameter, and at 6-month intervals for AAAs >4 cm in diameter, in order to detect enlargement of the aneurysm.
9.10.8.3 Candidates forOperative Management
The 2014 European Society of Cardiology (ESC) guidelines recommend that surgery should be considered in patients who have an isolated AAA with a maximal diameter of >5.5cm. Aortic arch repair may also be considered in patients with AAA who are already going to have surgery of an adjacent aneurysm located in the ascending or descending aorta [131]. In general, surgical treat­ment is often recommended for all symptomatic patients, patients with aneurysm size >5.5 cm, and any patient of TAA with a growth rate exceeding 0.5cm/year [134].
9.10.8.4 Operative Procedures
Advancements in open surgical techniques, safer anesthetic practices, and improvised methods of maintaining cerebral perfusion have revamped the most widely used conventional open repair procedure. The newer endo-vascular and hybrid modalities have also emerged. These newer tech­nologies have made surgical treatment possible even for a larger spectrum of patients, including those at high risk and with multiple co­morbidities. Each of these techniques has its own merits and demerits, and the choice is tailored considering peri-operative risks, co-morbidities, and anatomy of the lesion.
9.10.9 Prognosis
The prognosis of AAA largely depends on the size of the aneurysm and rate of expansion, which are the most signicant predictors of the rupture. Prognosis is usually good if timely intervention is instituted before rupture, which can have mortal­ity as high as 80% [130, 135, 136].
9.10.8.2 Surgical Treatment
Surgical intervention for treatment of AAAs raises a particular concern due to high rates of mortality, the need for creating a bloodless eld with circulatory arrest, and challenges in main­taining perfusion to the head, neck, and upper extremities [130].
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