Monarch Disease Ontology entry MONDO_0007142 (Townes-Brocks syndrome) (TBS) is a rare genetic disorder characterized by the triad of imperforate anus, dysplastic ears often associated with sensorineural and/or conductive hearing impairment, and thumb malformations. These features are often associated with other signs mainly affecting the kidneys and heart. Also known as: TBS, Townes syndrome, imperforate anus with hand, foot and ear anomalies, rear syndrome, renal-ear-anal-radial syndrome, sensorineural deafness with imperforate anus and hypoplastic thumbs.