Primary and metastatic renal hemangiopericytoma

Haemangiopericytoma is an uncommon perivascular tumor that occurs more frequently in soft tissues and is extremely rare in the kidney.

We report two cases: The first one is the case of a 57-year-old man with bilateral metastatic renal haemangiopericytoma which appeared 18 years after removal of a meningeal haemangiopericytoma. The second is a 29-year-old woman with a primary kidney haemangiopericytoma that was casually found in a nephrectomy piece.

In the first case, radical left nephrectomy and right renal mass radiofrequency ablation were performed. The patient had an uneventful postoperatory recovery. He remained disease-free 22 months after surgery but two new lesions appeared that were treated with radiofrequency ablation. The second case was a casual finding, a small tumor that had been totally resected.

Haemangiopericytoma is a rare tumor with an uncertain clinical behaviour. Long-term follow up is important as local recurrences and metastases can develop years after initial treatment.