title: Perineal choristoma and atresia ani in 2 female Holstein Friesian calves.
abstract: Atresia ani, a congenital anomaly of the anus, can be associated with other types of malformation. Two female Holstein Friesian calves had imperforate anus, rectovaginal fistula, and perineal choristomas. In one case, the choristoma was composed of mature adipose and fibrous tissue with nephrogenic rests. In the other calf, the choristoma consisted of fragments of trabecular bone coated by cartilage and containing marrow, mixed with mature adipose and fibrous tissue, striated muscle fibers, nerves, and vessels. This combination of malformations resembles the association of anorectal malformations and perineal masses in children.
authors.affiliation: Department of Veterinary Pathology, Hygiene, and Public Health, Veterinary University Hospital, Università degli Studi di Milano, Lodi, Italy. diana.binanti@unimi.it
authors.forename: D
authors.initials: D
authors.lastname: Binanti
authors.forename: I
authors.initials: I
authors.lastname: Prati
authors.forename: V
authors.initials: V
authors.lastname: Locatelli
authors.forename: D
authors.initials: D
authors.lastname: Pravettoni
authors.forename: G
authors.initials: G
authors.lastname: Sironi
authors.forename: P
authors.initials: P
authors.lastname: Riccaboni
mesh_terms: D000273:Adipose Tissue; D000818:Animals; D001006:Anus, Imperforate / Q000473:pathology / Q000601:surgery / Q000662:veterinary*; D001842:Bone and Bones; D002417:Cattle; D002418:Cattle Diseases / Q000473:pathology* / Q000601:surgery; D002828:Choristoma / Q000473:pathology / Q000601:surgery / Q000662:veterinary*; D003937:Diagnosis, Differential; D005260:Female; D010502:Perineum / Q000473:pathology*; D012006:Rectovaginal Fistula / Q000473:pathology / Q000601:surgery / Q000662:veterinary*