Rectal endometriosis mimicking rectal carcinoma

摘要

A 35-year-old office lady was admitted to our hospital complaining of intermittent constipation for 3 years. The specific symptoms such as hematochezia, abdominal pain, abdominal distention, dejecta turning small and anus distentin were not occurred. There was no previous history of trauma or surgery. She had regular menses lasted for 5-6 days every 28 day since 13-year old without dysmenorrhea. She gave birth to a healthy daughter several years ago, and neither abortion nor omotocia was done. Physical examination showed no positive signs. Laboratory data show normal except hemoglobin 112 g/L and carbohydrate antigen 19-9 (Cal9-9) 40.78 IU/L. Colonos-copy revealed a mass about 4.0*5.0 cm in size located at about 10 cm-15 cm distance away from the anus. The imagines under chromoendoscope stained by Indigo carmine and magnifying endoscope displayed the crypt pit pattern was pit V_N which usually indicated the mass was progressive rectal carcinoma (Fig. 1A-B). The pathological result confirmed the mass was not rectal carcinoma but rectal endometriosis (Fig. 1C).