Anal sac adenocarcinoma
Location: Small skin pockets near the anus
Behaviour: Slow growth, locally invasive, fast metastasis
Diagnostics: Rectal examination, cytology, histology
Treatment: Surgery, radiotherapy or chemotherapy
Prognosis: Moderate to good if discovered early
Here you can find pictures of dogs with this tumour type. These images may be unsuited for sensitive viewers.
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A bulging of the anus wall is visible at the bottom right of the screen. Metastases to the pelvic lymph nodes were found in this dog.
  1. Turek MM, Withrow SJ. Perianal Tumors. Withrow and MacEwen's Small Animal Clinical Oncology, 5th edition, Chapter 22 Withrow (p 423).
  2. ​McQuown B, Keyerleber MA, Rosen K, McEntee MC, Burgess KE. Treatment of advanced canine anal sac adenocarcinoma with hypofractionated radiation therapy: 77 cases (1999-2013).Vet Comp Oncol. 2016 Mar 16. doi: 10.1111/vco.12226.
Clinical trials
Study of the behaviour of metronomic chemotherapy agents

Service of Cancerology, VetAgro Sup, Campus veterinary medicine
Lyon, France