Case 47 Male, 75 years. Bluish nodule, skin of gluteal areaShow diagnosis & comments
Cellular blue naevus with very focal necrosis and hemorrhage (therefore called ‘atypical cellular blue naevus by some). Regarded as benign
Very focal necrosis, and some haemorrhage is seen (therefore called 'atypical cellular blue naevus by some). Mitoses are scarce, and there is no nuclear atypia beyond what is usually seen in cellular blue naevi. The lesion is regarded as benign.
Tran TA, Carlson JA, Basaca PC, Mihm MC. Cellular blue nevus with atypia (atypical cellular blue nevus): a clinicopathologic study of nine cases. J Cutan Pathol. 1998 May;25(5):252-8.