Abstract:
Renal cysts are the most common space occupying lesions of kidneys. These may be simple or
complex. Complex renal cysts are suspicious for malignancy. Computed tomography is the gold
standard in diagnosis of complex renal cysts. Negligence resulting in retained surgical foreign
bodies does occur in our setup and world over. We present a unique case of retained gauze piece
presenting as complex renal cyst, diagnosed four years after pyelolithotomy. A 50 year old male
presented with history of on and off right lumbar pain for the last one year, along with low
grade intermittent fever and weight loss. Past history revealed that he was operated for renal
stones four years ago. Radio imaging including ultrasonography and CT scan revealed complex
renal cyst. Patient was explored and found to have thick walled cyst with old gauze in it.
