Alveolar rhabdomyosarcoma (ARMS) is a rare mesenchymal tumor with differentiation towardthe skeletal muscle. Although several cases of canine ARMS have been reported inveterinary medicine, only one case of abdominal ARMS has been reported in a cow. A13-month-old, Japanese black heifer was referred for pus-like nasal discharge. On autopsy,an 11 × 7 × 4.5-cm pedunculated mass closed to the left palatine tonsillar sinus thatoccupied the laryngopharynx. Histopathological and immunohistochemical analyses indicatedthat the tumor was a typical ARMS. To the best of our knowledge, this has been the firstcase of primary pharyngeal ARMS in a Japanese black heifer, which is rare among cows.Nonetheless, its characteristics, including site, age and subtype, are identical to thoseamong humans and dogs.
展开▼
