An anal adenocarcinoma characterized by the presence of mucoid stroma formation. The disease is MONDO_0002734 (anal mucinous adenocarcinoma). Also known as: anal colloid adenocarcinoma, anal colloidal adenocarcinoma, anus mucinous adenocarcinoma, colloid adenocarcinoma of anus, colloid adenocarcinoma of the anus, colloidal adenocarcinoma of anus, colloidal adenocarcinoma of the anus, mucinous adenocarcinoma of anus.