Among complementary tests requested for the unknown-origin iron deficiency patient, gastroscopy and colonoscopy are frequent. However, it is important to assess the need to perform other studies if an etiological diagnosis is not reached, among which the endoscopic capsule stands out. In this case report the endoscopic capsule was essential to establish the jejunal adenocarcinoma diagnosis in an early stage of the disease, allowing the patient to undergo a curative surgical treatment without necessity of other therapies.
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