Description: Histology Atypical melanocytes in nests

History:

 This lesion was noted on the abdominal wall during a routine skin examination. Again the patient had not been aware of it. 

Dermatoscopy showed a thickened network in areas with some loss centrally. There were a few radial segmental lines and a suggestion of grey. 

Histology showed an in situ melanoma with nests of atypical melanocytes in the rete ridges. No real pagetoid spread was seen.

Excision with 5 mm clinical margins after the initial shave biopsy.