title: Infiltrative angiolipoma of the parotid salivary gland in a dog.
abstract: Solitary benign angiolipoma and infiltrative angiolipoma are rare tumours in dogs. Angiolipomata can be distinguished histologically from lipomata by the large number of tightly packed blood vessels seen between the adipocytes with multiple fibrin thrombi occupying some of the vessels' lumens. The dog presented with a solitary slow-growing mass in the cervical region. Histopathology revealed multifocal to coalescing single or clusters of blood-filled vessels lined by flattened endothelial cells with narrow, elongated, basophilic nuclei. These regions were embedded in adipose tissue with multifocal areas of intervascular remnants of differentiated serous salivary glandular tissue with multifocal small ducts. Fibrin thrombi occupied a few of the vessel lumens. A histological diagnosis of infiltrative angiolipoma was made. On computed tomography, the mass was bilobed with a suspected primary component involving the right parotid gland which was grossly enlarged. The mass had a slightly hypoattenuating mottled to lobulated appearance with a few hyperattenuating mineralised specks throughout. Hounsfield units of the mass ranged between 40 and 45, which was less than the 60-65 of the contralateral salivary glands and cranial musculature. Post contrast images showed no contrast enhancement of 90% of the mass with only a band of peripheral contrast uptake of the affected lateral lobe.
authors.affiliation: Section of Small Animal Surgery, Department of Companion Animal Clinical Studies, Faculty of Veterinary Science, University of Pretoria, Private Bag X04, Onderstepoort 0110, South Africa. adriaan.kitshoff@up.ac.za
authors.forename: A M
authors.initials: AM
authors.lastname: Kitshoff
authors.forename: I R
authors.initials: IR
authors.lastname: Millward
authors.forename: J H
authors.initials: JH
authors.lastname: Williams
authors.forename: S J
authors.initials: SJ
authors.lastname: Clift
authors.forename: R M
authors.initials: RM
authors.lastname: Kirberger
mesh_terms: D018206:Angiolipoma / Q000473:pathology / Q000601:surgery / Q000662:veterinary*; D000818:Animals; D004283:Dog Diseases / Q000473:pathology* / Q000601:surgery; D004285:Dogs; D005260:Female; D012468:Salivary Gland Neoplasms / Q000473:pathology / Q000601:surgery / Q000662:veterinary*