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28 Mohs Surgery for Periungual and Subungual Skin Cancer

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functional and cosmetic results. Rarely, if the whole matrix has been excised, a split-thickness skin graft may be considered.

After completion of the Mohs surgery without a repair, a pressure dressing is applied. The pressure dressing is used to facilitate hemostasis by applying constant pressure along the surgical site. Vaseline or an antibiotic ointment is initially applied to the surgical site to promote wound healing. A non-stick dressing is placed over the site, and then gauze is cut and then applied. Paper tape may be used to secure the bandage. For exudative wounds, Kerlix may be applied to wrap the entire digit. This dressing is removed by the patient after 24 hours. Oral antibiotics and painalleviating medications may also be given depending on the situation. Prescribing a sling for the patient to elevate the arm helps reduce postoperative edema and pain. For work on a patient’s toes, sandals, or a special boot that exposes the toes and laces along the dorsum of the foot, are useful.

Summary: Complications

Extensor tendon rupture can occur when excising tissue proximal to the nail matrix.

Summary: Conclusions

Mohs surgery is particularly useful in removing tumors of the nail unit because this technique preserves as much normal tissue as possible, especially nail matrix.

28.6Conclusions

While tumors of the nail unit are relatively rare, traditional surgical techniques of wide local excision or amputation can be debilitating for the patient. Mohs surgery offers many advantages compared to traditional surgical methods. Because Mohs surgery requires the mapping of the tumor, complete clearance of the disease may be obtained. As unaffected tissue (especially the matrix, either in part or totally) is spared, Mohs surgery assures maximal preservation of the surrounding noncancerous tissue. The ultimate benefit to the patient is that Mohs surgery provides an alternative surgical method that leads to a more cosmetically and functionally acceptable result for the patient.

References

28.5Complications

Primary complications with nail unit surgery include pain, infection, and swelling of the digit. Painalleviating medications such as hydrocodone and acetaminophen (VicodinRx) or codeine and acetaminophen (Tylenol #3Rx) are useful for alleviating patient discomfort. Oral antibiotics effective against Staphylococcus aureus and/or methicillin-resistant Staphylococcus aureus should be considered. Edema of the digit and hand is a complication that may cause temporary tenderness and stiffness along the digit. This problem will resolve gradually with time, and elevation of the extremity will expedite the recovery process.

Transection of the extensor tendon has occurred in one of our cases. If not repaired immediately, the patient will not be able to dorsiflex the finger.

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