RADIOLOGY: KIDNEY: Case# 33031: SPONTANEOUS PERINEPHRIC HEMATOMA & F/U EXAM. The patient is a 40-year-old black female with neurofibromatosis who presents with four days of back and abdominal pain.IVP showed what appeared to be a left renal pelvic filling defect. The patient denies any history of trauma. 1) Spontaneous left perinephric hematoma in this patient without history of trauma. Such a hematoma could occur secondary to a ruptured cyst or tumor. No tumor is definitely shown on this CT scan. Follow up CT scan is recommended after resolution of the hematoma in order to evaluate for a primary lesion in this area (three to six months). 2) Small left pleural effusion 3) Subcutaneous neurofibromas.