Description: Histology showing invasive melanoma

History:

 This 57 years old male presented with a lesion on his thigh that he said had only been present for 6 weeks. It looked and felt keratotic and had a bluish discolouration associated with it. It was thought to be an irritated Seborrhoeic keratosis perhaps with some bleeding into it to account for the blue colour.

 

The shave biopsy was reported as a level 4 Invasive melanoma 1.7 mm thick with 3 mitoses per high powered field. There were no groin glands enlarged clinically.