Fallopian Tube Tumor Mimicking Primary Gastrointestinal Malignancy.

A 67-year-old female patient positive for a mismatch repair gene mutation and history of serous carcinoma of the fallopian tube presented with a lower gastrointestinal bleed. Clinical workup was suggestive of a primary gastrointestinal malignancy. Pathological review after right hemicolectomy revealed the primary tumor was a fallopian tube carcinoma. Over the next few years, she presented with upper and lower gastrointestinal bleeds from a recurrent metastatic disease, which was from the primary fallopian tube cancer. Although serous carcinoma of the fallopian tube is not an uncommon diagnosis, it is unusual for it to present with symptoms of recurrent gastrointestinal bleed mimicking a primary gastrointestinal malignancy.