RESUMEN
The urachus is a midline tubular structure that extend between bladder dome and umbilicus which result from incomplete regression during normal development. Defective obliteration of the urachus is rare and can result in urachal abnormalities, most commonly malignant masses. Xanthogranulomatous urachal masses are rare forms of chronic inflammatory processes with only few reported cases. Differentiating malignant from benign urachal lesion is challenging due to lack of typical clinical and radiologic manifestations, coupled with limited diagnostic experience or awareness. We present an initial misdiagnosis of urachal carcinoma, which was revealed to be benign xanthogranulomatous inflammation of urachus on postoperative histopathological examination.