Case 31 Male, pigmented nodule, skin of buttockShow diagnosis & comments
Cellular blue naevus, with focal balloon cell change
Focal balloon cell change is not uncommon in cellular blue naevi, but it is usually less pronounced than in this lesion.
Perez MT, Suster S. Balloon cell change in cellular blue nevus. Am J Dermatopathol. 1999; 21: 181-4.