Acute presentation of renal pseudoaneurysms in a patient with systemic lupus erythematosus after percutaneous renal biopsy.

The development of renal pseudoaneurysms following percutaneous kidney biopsy is a rare but potentially dangerous complication due to the risk of rupture with subsequent hemorrhage. We describe a female patient in her 20s with long-standing lupus nephritis who presented to the hospital for elective CT-guided left renal biopsy that was complicated by pseudoaneurysms in the bilateral kidneys. Post-biopsy, she developed a perinephric hematoma that extended to the upper pelvis with resultant superior displacement and diminished blood flow to the left kidney. Successful endovascular coil embolization was performed after left renal artery angiography confirmed contrast extravasation in one of the branches that supplied the inferior pole of the left kidney. Despite the embolization, her hemoglobin continued to decline, and a subsequent CT-scan demonstrated a persistent loculated hyperdense fluid collection in the beforementioned area. Repeat angiography revealed multiple left renal pseudoaneurysms and a single pseudoaneurysm in the upper pole of the right kidney, neither of which were previously visualized. The acute development of pseudoaneurysms due to accidental or non-accidental trauma is a well-established entity. Here we present a patient that acutely developed numerous arterial pseudoaneurysms after renal biopsy and has never been reported in the literature. Special caution should be undertaken in the case of high-risk patients predisposed to these pseudoaneurysms.