Histologic Variants : Pigmented PanNET

Comments:
Pigmented "black" neuroendocrine tumor of pancreas has dark brown/black cytoplasmic granules of lipofuscin pigment. The tumor may mimic metastatic melanoma at first glance; however, melanocytic markers are negative.

Image courtesy of: Dr. Runjan Chetty (@RunjanChetty); used with permission.