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Nevus lipomatosus cutaneous superficialis with focal lipocytic pagetoid epidermal spread and secondary calcinosis cutis: a case report.

A case of nevus lipomatosus cutaneous superficialis is presented, wherein the lesion occurred as a gluteal swelling in a 6-year-old boy. On histopathology examination, it consisted of typical superficial expanses of mature adipose tissue in the papillary dermis of the polypoidal lesion. It was accompanied by 2 unusual findings, which consisted of the focal presence of lipocytes at the epidermal–dermal junction in the pagetoid manner and the prominent deposition of calcium resulting in calcinosis cutis–like lesions. Calcinosis cutis in the present case occurred as dystrophic calcification in focal fat necrosis changes of the lesion, whereas the focal pagetoid spread of fat cells is likely related to the same hamartomatous adipose tissue growth that ultimately results in the nevus lipomatosus.