2025 Volume 61 Issue 7 Pages 1030-1034
We report a pediatric case, which developed renal hypertension following the development of a subcapsular renal cyst, not related to urinary extravasation or hematoma, after blunt renal trauma. A 5-year-old boy was brought to a local hospital after falling from playground equipment, hitting his right flank, and subsequently developing hematuria. Imaging examination revealed a renal capsular injury and perirenal hematoma formation at the upper pole of the right kidney, and the patient was diagnosed with grade II renal injury. The patient was treated conservatively in the hospital. During follow-up as an outpatient, progressive enlargement of a subcapsular renal cyst was noted, and he was referred to our department. Initially suspected to be urinary leakage, we punctured the cyst and placed a double-J ureteral stent. The cyst temporarily decreased in size but subsequently enlarged. The patient developed renal hypertension, likely due to compression of the enlarging cyst (i.e., Page kidney). Antihypertensive medication was initiated, and a drainage catheter was placed. The cyst gradually became smaller within three months of drainage. However, even two years after the drainage catheter was removed, antihypertensive therapy was required. This case demonstrates that post-traumatic subcapsular renal cysts can be a cause of renal hypertension. Careful follow-up is required after renal trauma.
