How wide should margins be for melanoma?
Margin width should be 1 cm for melanomas 1 mm thick, 1 or 2 cm for melanomas 1 to 2 mm thick, and 2 cm for melanomas 2 mm thick. The margin width for wide local excision of a melanoma in situ should be 5 mm. Standard wide local excision margin recommendations also apply to melanomas of the skin of the digits.
Is an atypical nevus malignant?
Article Sections. Atypical moles are benign pigmented lesions. Although they are benign, they exhibit some of the clinical and histologic features of malignant melanoma. They are more common in fair-skinned individuals and in those with high sun exposure.
Should I be worried about an atypical mole?
Yes. An atypical mole that is itching, painful, swelling, crusting or oozing should be checked immediately by a dermatologist or other physician experienced with skin disorders.
What is a high mitotic rate in melanoma?
Melanomas with very high mitotic activity (≥10 mitoses/mm2) were predominantly thick and ulcerated nodular tumor subtypes. Conversely, the superficial spreading melanoma subtype, features of regression, and the presence of preexisting nevi were found to be characteristic of lesions with sparse mitotic activity.
What is a good mitotic count?
Mitotic activity should be reported as an average over 10 hpf (i.e., using the 40× objective on most conventionally configured microscopes). Enough fields should be counted to determine a statistically valid average. Generally, 30 hpf are sufficient, but occasionally 50 or more hpf may be needed.
Should all atypical moles be biopsied?
Your doctor may perform a biopsy on a suspect spot. Under the microscope, atypical moles can have unusual features that are graded as mild, moderate, or severe. If the biopsy shows a mildly or moderately atypical mole, and it has been removed fully, no further treatment is needed.
What is a moderately atypical dysplastic nevus?
Moderately atypical nevi do not show the central maturation of the fried egg nevus. They tend to be larger than normal junctional nevi with some variation of colour and edge. Colour is often regularly irregular. A severely dysplastic nevus is indistinguishable from early melanoma.
Do benign tumors have a high mitotic index?
Occasionally, the mitotic rate in benign tumors may be brisk, and those with mitotic activity up to 15 mitoses/10 hpf are termed leiomyomata with increased mitotic activity (Fig.