title: Evaluation of an anal sac adenocarcinoma tumor in a Spitz dog.
abstract: A 9-year-old emasculated male Spitz with tenesmus and constipation had a subcutaneous mass at the left ventral aspect of the anus with history of polyuria and polydipsia. A complete blood cell count, serum biochemistry panel, and urinalysis (cystocentesis sample) were evaluated. Abnormalities in the serum biochemistry panel included a mildly elevated serum cholesterol concentration (7.28 mmol/L; reference interval, 2.70-5.94 mmol/L), increased serum alkaline phosphatase activity (184 U/L; reference interval, 9-90 U/L), alanine transaminase (122 U/L; reference interval, 5-60 U/L) activity and aspartate aminotransferase (80 U/L; reference interval, 5-55 U/L) activity, severe increased total calcium concentration (16.3 mg/dL; reference interval, 8.2-12.4 mg/dL or 9.3-11.4 mg/dL), and decreased total calcium concentration (3.4 mg/dL, reference interval, 2.5-5.6mg/dL). Furthermore, testing revealed an increased intact parathyroid hormone concentration (38.6 pmol/L; reference interval, 3-17 pmol/L). On cytologic and histopathologic examinations, various types of cells were observed. Most of the cells were oval to polygonal and had elliptical or elongate nuclei and a moderate amount of pale to basophilic cytoplasm. The remaining cells had round to oval nuclei and pale to basophilic cytoplasm. Cells of both types were loosely adhered to each other and were arranged in rosette-like structures. Both neoplastic cell types had fine homogenous chromatin and either a small indistinct nucleolus or no visible nucleolus. Mild anisokaryosis and anisocytosis were observed. Histologically, the mass consists of glandular structures formed by cuboidal cells admixed with bundles of spindle cells. Based on location and histologic features, the final diagnosis was adenocarcinoma of the apocrine gland of the anal sac, which should be included as a cytologic differential diagnosis when spindle cells and typical epithelial cells are observed in masses in the region of the anal sac of dogs.
authors.affiliation: Departemnt of Pathology, Faculty of Veterinary medicine, University of Tehran, Tehran, Iran.
authors.forename: Javad
authors.initials: J
authors.lastname: Javanbakht
authors.forename: Abbas
authors.initials: A
authors.lastname: Tavassoli
authors.forename: Atefeh
authors.initials: A
authors.lastname: Sabbagh
authors.forename: Mehdy Aghamohammmad
authors.initials: MA
authors.lastname: Hassan
authors.forename: Shohreh Alian
authors.initials: SA
authors.lastname: Samakkhah
authors.forename: Radmehr
authors.initials: R
authors.lastname: Shafiee
authors.forename: Ali
authors.initials: A
authors.lastname: Lakzian
authors.forename: Vahideh Rahmani
authors.initials: VR
authors.lastname: Ghalee
authors.forename: Sonia Shoja
authors.initials: SS
authors.lastname: Gharebagh
mesh_terms: D000230:Adenocarcinoma / Q000175:diagnosis / Q000473:pathology / Q000601:surgery / Q000662:veterinary*; D000694:Anal Gland Neoplasms / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000473:pathology* / Q000601:surgery; D000695:Anal Sacs / Q000473:pathology* / Q000601:surgery; D000818:Animals; D003937:Diagnosis, Differential; D004283:Dog Diseases / Q000175:diagnosis* / Q000473:pathology / Q000601:surgery; D004285:Dogs; D008297:Male; D013045:Species Specificity; D016896:Treatment Outcome; D014463:Ultrasonography
keywords: Anal tumors; Cytology; Dog; Histopathology; Surgery