Description: These features could suggest solar lentigo or lentiginous melanoma if the melanocytes are considered sufficiently atypical.

History:

This 93 years old man has severe solar damage with three atypical pigmented lesions on the back. This is the presentation of the labelled lesion C. I thought clinically this would be a melanoma but the histology was best described by the pathologist as dysplastic junctional lentiginous nevus. Other pathologists would describe this as lentiginous melanoma which I would tend to agree with.

View a YouTube video of this case and the two previous lesions from this patient.