Mucocele apendicular confundido con quiste de uraco infectado: un diagnóstico diferencial a tener en cuenta

objective: to report one case of appendiceal mucocele misdiagnosed with an infected urachal cyst and to review their differential diagnosis, treatment and prognosis. patient: we report the case of a 74 year-old-male with abdominal pain, fever and dysuria. hypogastric abscess image in ultrasonography and ct. percutaneous drainage and antibiotic therapy. opaque enema, colonoscopy and cystoscopy were normal. results: exploratory laparotomy and resection of a large cecum-fixed mass, independent to the bladder. appendectomy and cecectomy. pathology showed an appendiceal mucinous cystoadenoma (mucocele). conclusions: appendiceal mucoceles and urachal cysts are uncommon, mostly asymptomatic. cystoadenoma or cystoadenocarcinoma mucoceles are large and can reach the midline, confounding with urachal cysts. diagnosis by ultrasonography and/or ct. surgical treatment in both, keeping the mucocele intact during operation to avoid the risk of pseudomyxoma peritonei.