A in situ carcinoma that involves the oropharynx. The disease is carcinoma in situ of oropharynx (Monarch Disease Ontology entry MONDO_0021298). Also known as: carcinoma in situ of the oropharynx, oropharyngeal cancer stage 0, oropharyngeal carcinoma in situ, oropharynx carcinoma in situ, oropharynx in situ carcinoma, stage 0 carcinoma of oropharynx, stage 0 carcinoma of the oropharynx, stage 0 oropharyngeal cancer.