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- Presentation
Complex Mohs Surgery: Pearls for Large Tumors and Challenging Anatomic Sites
Description
The speaker reviewed practical pearls for complex Mohs surgery involving large tumors and difficult anatomic sites. For large tumors, the key themes were careful preoperative planning, thorough physical exam, imaging when tumors are fixed, greater than 2 cm, or suspected of having bony or perineural involvement, and explicit informed consent about possible sensory or motor deficits. He emphasized taking photographs, debulking bulky tumors to reveal high-risk features and improve processing, and grossing tissue in as few pieces as possible to reduce floaters, false negatives, and manipulation. A major pathology pitfall discussed was the tethered floater, which can mimic residual tumor at the margin in thick specimens; he recommended horizontal relaxing incisions to avoid this fold-over artifact. For auricular tumors, he advised lidocaine hydrodissection, aggressive beveling to preserve margin visibility, use of specialized blades such as tympanoplasty or myringotomy blades, and additional incisions like tragusotomy, canalotomy, or helicotomy to improve access and visualization. For grossing ear specimens, he recommended dividing tissue along natural inflection points. For nail tumors, he suggested preoperative x-ray to assess bone involvement, good bloodless anesthesia, a helpful instrument set including skin hook, freer elevator, and nail nippers, and techniques such as staining the nail bed with marker, softening the nail with chlorhexidine soaks, and dissecting laterally before moving distal to proximal to better stay on the distal phalanx. Overall, the talk stressed anticipation, meticulous technique, and smart specimen handling to improve outcomes in challenging Mohs cases.
View moreConclusions
- Successful management of complex Mohs cases depends on careful preoperative planning, a thorough physical exam, and imaging when tumors are large, fixed, or otherwise high risk.
- Patients should be explicitly counseled about expected sensory or motor deficits so predictable side effects are not later perceived as complications.
- For large tumors, debulking and grossing should be done strategically in as few pieces as possible to reduce manipulation, freezing problems, and pathology artifacts.
- Thick specimens are best handled with horizontal relaxing incisions to prevent tethered floaters and false-positive deep margins caused by fold-over effects.
- Auricular tumors are easier to treat when surgeons use specialized blades and, when needed, add incisions such as tragusotomy, canalotomy, or helicotomy to improve visualization and access.
- Ear cases benefit from meticulous technique, including lidocaine hydrodissection, appropriate beveling, and warm irrigation to avoid vertigo.
- Nail unit tumors require strong anesthesia, a bloodless field, and often preoperative imaging to assess for bony involvement.
- For nail surgery, marking the nail bed and approaching dissection laterally before proceeding distal-to-proximal helps ensure complete removal while minimizing injury.
- Overall, the presentation concludes that complex Mohs outcomes improve when surgeons combine anatomy-based planning, careful tissue handling, and site-specific technical modifications.
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- Mohs Micrographic Surgery of the Nail Unit and Squamous Cell Carcinoma. Martin N. Zaiac, MD, and Eduardo Weiss, MD#10.1097/00042728-200103000-00007