Primary signet-ring cell carcinoma is a rare and aggressive histological variant of primary bladder adenocarcinoma with a usually delayed diagnosis and poor prognosis. No standard treatment modality exists for this tumor till now because of its rarity. We present an atypical case of pure primary signet-ring cell carcinoma of the bladder, without obvious bladder mass on CT scan. The patient underwent a radical cystectomy with ileal conduit, and adjuvant chemotherapy (Gemcitabine/ Carboplatin).

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