A 60-year old woman visited our department complaining of a slow-growing, left auricular mass. On physical examination, a firm, reddish, non-tender large mass was observed in the left auricle, originating from the antitragus. Neck computed tomography revealed a slightly enhanced, soft tissue-density solid mass, 3 ¡¿ 2.5 ¡¿ 2 cm in size, in the left antitragus. Surgical excision of the suspected vascular tumor was planned.
With the patient under local anesthesia, the mass was completely removed. The histopathological findings and immunohistochemical staining pattern were those of a myopericytoma.
A myopericytoma is a rare, benign, soft tissue neoplasm that exhibits perivascular myoid differentiation. It is rare in the head and neck region.
Histopathologically, a myopericytoma is characterized by proliferation of round-to-ovoid spindle-shaped cells with eosinophilic cytoplasm in a perivascular concentric pattern. Immunohistochemically, a myopericytoma is positive for SMA, h-caldesmon, and vimentin; it is negative for desmin and S100.
The treatment of choice is surgical excision. A myopericytoma generally follows a benign clinical course if surgical excision is complete. |