Myopericytoma presenting as a painful dark subungual discoloration
- Author(s): Antunes-Duarte, Sofia;
- Aguado Lobo, Marta;
- Espinosa Lara, Pablo;
- Fraga, Ana;
- Soares-de-Almeida, Luis
- et al.
Published Web Locationhttps://doi.org/10.5070/D328257395
Myopericytoma is an uncommon benign neoplasm that arises from the perivascular myoid cells. It typically presents as a painless well-circumscribed cutaneous or soft-tissue nodule, most commonly on the extremities of adults. Histologically, it is characterized by spindle-shaped myoid-appearing cells with a concentric arrangement in vessel walls, that are immunoreactive to alpha-smooth muscle actin and often for h-caldesmon, but negative for other smooth muscle markers. Herein, we present an unusual case of a painful subungual myopericytoma presenting as a dark subungual discoloration.