Giant Renal Cyst Causing Malnutrition and Weight Loss: A Case Report.

Simple renal cysts are the most common cystic abnormalities of the kidney, typically observed in older individuals and often asymptomatic, requiring no treatment. These cysts are usually detected incidentally during imaging for unrelated conditions. Giant renal cysts, defined as those exceeding 15 cm in diameter and containing over 1500 mL of serous fluid, are exceptionally rare. We report a case of a 34-year-old male presenting with a rapidly growing giant renal cyst (40 × 28 cm) in the left kidney, resulting in malnutrition and significant weight loss. The patient underwent successful laparoscopic transperitoneal cyst excision. At the 1-year follow-up, the patient was asymptomatic, with no evidence of residual cyst recurrence.