Miopericitoma renal: presentación de un caso y revisión de la literatura

Myopericytoma is an infrequent neoplasm of perivascular myoid cells that usually originates in the skin and superficial soft tissues of distal extremities but is rarely found in the visceral organs. Only four cases of renal myopericytoma have been previously reported. We present a further case of myopericytoma of the kidney in a 21 year old woman with no clinical history of interest who presented with abdominal pain and a palpable mass in the left upper quadrant. Unenhanced computed tomography revealed a 7 cm diameter mass in the middle portion and anterior aspect of the left kidney. The patient underwent left radical nephrectomy. Histological examination revealed a tumour composed of ovoid cells in a concentric arrangement and a «glomangiopericytoma» pattern. Immunohistochemistry showed positivity for smooth muscle actin, and smooth muscle myosin stains and negativity for desmin, confirming the diagnosis of renal myopericytoma.