The primary mucinous adenocarcinoma of the bladder is an extremely rare urologic entity, which is found in less than 2% of all urinary bladder tumors and is often presented as metastatic. The authors report two cases of bladder adenocarcinoma with epispadias bladder exstrophy complex in two adults. The first case was about a 40-year-old patient referred for management of an EEC evolving since birth. The examination on admission revealed a deterioration in general condition and a bladder plate seat of an ulcero-necrotic tumefaction 3 x 2,5 cm with complete epispadias. The ureteral meatus were visible on each side at the lower part of the plate. Biopsy of the ulcero-necrotic mass revealed a well-differentiated bladder adenocarcinoma. Radical cystectomy and urinary diversion with an ileal conduit, and an expanded local lymphadenectomy was Indicated but the patient died before performing surgery. The second case is about a 28-year-old patient referred for management of an EEC evolving since birth associated with bilateral groin hernia. He had a good general condition, a bladder plate with complete epispadias. Treatment was cystectomy with Bricker urinary. Histo-pathological examination of the specimen reveled mucinous adenocarcinoma of the bladder. After review of the literature, it is a histological type with a poor prognosis and the role of surgery and adjuvant treatment remains to be defined.