Inflammatory pseudotumor of urachus mimicking invasive carcinoma of bladder.

Inflammatory pseudotumor of the bladder is a rare benign lesion of unknown etiology. We present a new case of pseudotumor of the urachus in a 16-year-old boy with no significant urologic history. This benign condition mimics invasive malignant tumors of the urinary bladder, and aggressive surgery is the basic treatment modality.