title: Malignant mesenchymoma in the nasal cavity of a bull.
abstract: A 4-year-old bull was presented with facial distortion and abnormal respiratory noise. Endoscopically, a proliferative mass was found obliterating the left nasal cavity and a tumour was suspected. The head was examined after slaughter and there was a well-circumscribed solid structure (15×12×6 cm) extending into the paranasal sinus, the choanal region and the bones of the orbit, with focal penetration of the nasal septum. Microscopically, the mass consisted of well-differentiated trabeculae of woven and lamellar bone, areas of chondromyxomatous, immature and mature cartilaginous tissue, and regions with irregular whorled spindle cells. Tissue differentiation of the mass was variable. Centrally, there was osseous differentiation with an outermost fibromatous area resembling a zone of endochondral ossification. There was suppurative and ulcerative inflammation where the tumour extended through the hard palate and into the pharynx. A nasal malignant mesenchymoma was diagnosed on the basis of these features.
authors.affiliation: Department of Pathology, University of Veterinary Medicine, Bünteweg 17, Hannover, Germany. christina.puff@tiho-hannover.de
authors.forename: C
authors.initials: C
authors.lastname: Puff
authors.forename: W
authors.initials: W
authors.lastname: Kehler
authors.forename: W
authors.initials: W
authors.lastname: Baumgärtner
authors.forename: C
authors.initials: C
authors.lastname: Herden
mesh_terms: D000818:Animals; D002417:Cattle; D008297:Male; D008637:Mesenchymoma / Q000473:pathology* / Q000662:veterinary*; D009296:Nasal Cavity / Q000473:pathology*; D009669:Nose Neoplasms / Q000473:pathology* / Q000662:veterinary*