Case 33 Female, 39 years. Nodule, skin of gluteal regionShow diagnosis & comments
Cellular blue naevus
This example is almost entirely amelanotic. To those unfamiliar with cellular blue naevi, this appearance may lead to all sorts of misdiagnoses. The melanocytic lineage is easily demonstrated with a few immune stains.
Zembowicz A, Granter SR, McKee PH, Mihm MC. Amelanotic cellular blue nevus: a hypopigmented variant of the cellular blue nevus: clinicopathologic analysis of 20 cases. Am J Surg Pathol. 2002; 26: 1493-500.