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Ossifying Plexiform Tumor: A Case Report.
American Journal of Dermatopathology 2021 Februrary 17
ABSTRACT: Ossifying plexiform tumor is an exceedingly rare cutaneous neoplasm with distinctive histologic features. The typical microscopic appearance is that of a well-circumscribed dermal lesion composed of spindled and epithelioid cells in a myxoid appearing matrix with a plexiform architecture associated with areas of ossification. The present report details the clinicopathologic features of an ossifying plexiform tumor involving the lower extremity of a 69-year-old man. The cutaneous lesion exhibited characteristic morphologic features of this entity. By immunohistochemistry, the tumor was negative for most markers assessed, but notably exhibited diffuse positivity for SATB2. No lesional recurrence was observed. The present case serves to expand on the limited existing knowledge regarding the clinicopathologic features of this uncommon tumor. The histogenesis of ossifying plexiform tumor remains unclear; however, the demonstration of SATB2 expression in this case suggests osteoblastic differentiation.
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