perirenal lipoma

例句：

1. 1. The patient had a perirenal lipoma removed during the surgery.
   患者在手术中切除了一个腹膜脂肪瘤。
2. 2.The diagnosis of this condition is often made by ultrasound and biopsy.
   这种病症的诊断通常通过超声波和活检来确定。
3. 3. Perirenal lipomas are rare but can be dangerous if they grow large enough to press on vital organs.
   腹膜脂肪瘤罕见，但如果它们长得足够大以压迫重要器官，可能会造成危险。