Introduction:

Adenocarcinoma of the cecal appendix occurs in approximately 0.1 to 0.2% of all appendectomies. One subtype, mucinous adenocarcinoma, represents 0.08% of all neoplasms. Diagnosis is usually incidental and surgery is the best treatment option.

Clinical Case:

We describe the case of a 55-year-old male patient, evaluated for severe pain in the right iliac fossa, who was found to have an appendiceal mass during an open appendectomy. A fragmented appendix measuring 7 x 1.8 x 0.8cm, with mucoid content in its lumen; as well as mucin pools in more than 50% of the sample and signet ring cells in light microscopy revealed the pathological diagnosis of mucinous adenocarcinoma. Therefore, the pathological analysis of surgical pieces is transcendental, since there are infrequent diagnoses that can change the prognosis and course of clinical management of a patient.

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