Zygomatic gland adenoma in a dog: histochemical and immunohistochemical evaluation.
Orbital epithelial tumors in dogs are rare and most frequently malignant. Distinguishing their origin from the lacrimal or zygomatic gland is often challenging and is based mostly on tumor location. A case of adenoma involving the orbit in a 13-year-old, female, standard Schnauzer is reported. Histologically, the neoplasm was characterized by nests and cords of epithelial cells mostly forming small glandular structures. The origin of the tumor from the zygomatic gland was determined by histochemical characteristics (alcian blue pH 1 positive staining) of a small remnant of normal gland included within the tumor capsule. The benign nature of our finding was confirmed by follow-up information: 2 years after complete surgical removal of the mass no tumor recurrence or metastases was recorded.
Giudice
Chiara
C
Department of Veterinary Pathology, Hygiene and Public Health-Section of Veterinary Pathology, Università degli Studi di Milano, Milano, Italy. chiara.giudice@unimi.it
Marco
Rondena
R
Mirko
Radice
R
Luca
Mertel
M
Giorgio
Cammarata
C
D000236:Adenoma / Q000175:diagnosis / Q000662:veterinary*; D000818:Animals; D003937:Diagnosis, Differential; D004283:Dog Diseases / Q000175:diagnosis* / Q000473:pathology; D004285:Dogs; D005260:Female; D007150:Immunohistochemistry / Q000662:veterinary; D007765:Lacrimal Apparatus; D009918:Orbital Neoplasms / Q000175:diagnosis / Q000662:veterinary*