title: Synovial cell sarcoma in a sulphur-crested cockatoo (Cacatua galerita).
abstract: A 13-year-old sulphur-crested cockatoo (Cacatua galerita) was presented with a mass surrounding the right elbow joint. Radiographs showed a soft tissue mass. The right wing was amputated. Histological examination of the mass revealed an incompletely lobulated tumour composed of strands of spindle-shaped cells and of epithelial cells resembling acini. On morphological grounds the tumour was classified to be a synovial cell sarcoma. After 6 months the bird was returned for examination because of lameness in the right leg. Radiographs showed osteolysis in the right tibiotarsal bone. Cytological investigation of a bone marrow biopsy revealed neoplasia. The bird was euthanized. Necropsy revealed metastases in many organs. This is believed to be the first reported case of synovial cell sarcoma in a bird.
authors.affiliation: Division of Avian and Exotic Animal Medicine, Department of Clinical Sciences of Companion Animals, Faculty of Veterinary Medicine and Science, Utrecht University, Utrecht, The Netherlands.
authors.forename: H
authors.initials: H
authors.lastname: Van Der Horst
authors.forename: M
authors.initials: M
authors.lastname: Van Der Hage
authors.forename: P
authors.initials: P
authors.lastname: Wolvekamp
authors.forename: J T
authors.initials: JT
authors.lastname: Lumej