Case 3 Female, 65 years. Ulcerating lesion, great toeShow diagnosis & comments
- Most commonly affect the big toe, or thumb, of middle-aged or elderly patients
- Less uncommon in non-caucasians
- Often presents as melanonychia striata, or more gross abnormalities; considerable patient's and doctor's delay (misinterpretation as posttraumatic)
- Proliferation of atypical melanocytes whithin the nail bed, often in lentiginous arrangement and with ascent; invasion into underlying tissues
- Definitive surgical treatment generally requires amputation of phalanx or entire digit.