An alternate red and white colour-changing rectal carcinoid tumour

A 56-year-old female presented with a 3-month history of diarrhoea and abdominal pain. Colonoscopy examination found a mass (approximately 0.5×0.6×0.3cm) in the rectum 5cm from the anus. The overlying mucosa regularly alternated colour from white (Fig. 1) to red (Fig. 2) approximately every 10s. Endoscopic ultrasonography revealed its origin in the submucosa, and rectal carcinoid tumour was suspected. However, an ulcerative lesion was found in the transverse colon, and was pathologically diagnosed as adenocarcinoma.

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