Spontaneous Retroperitoneal Bleeding as a Complication of Unusual Renal Paraganglioma.

Spontaneous retroperitoneal bleeding is a rare occurrence that might have catastrophic implications. We present a 58-year-old male with a 4-day history of progressively worsening left-sided flank pain due to retroperitoneal hemorrhage from a nonfunctional renal paraganglioma. Abdominal contrast CT scan was helpful in locating the tumor, estimating tumor size and extent of bleeding, visualizing the interaction between the tumor and the surroundings, and ruling out any potential metastasis; however, it lacked specificity in identifying the origin of the mass, needing histologic investigation for a conclusive diagnosis.

Internal Iliac Aneurysm Causing Hydroureteronephrosis.

A 63-year-old presented with right lumbar pain and increased frequency of urination. Imaging revealed right internal iliac artery aneurysm causing hydroureteronephrosis and compressing the urinary bladder.