title: Systemic Mycobacterium smegmatis infection in a dog.
abstract: A 3-year-old female Basset Hound was examined because of fever and lameness of 2 months' duration. Physical examination revealed a small cranial abdominal mass, which had an ultrasonographic appearance of a large abdominal lymph node. Cytologic examination of an ultrasound-guided fine-needle aspirate of the mass revealed a few macrophages that contained numerous linear unstained structures consistent with mycobacteria. Intracellular acid-fast bacilli were identified in an aspirate that was stained with modified Ziehl-Neelsen. Exploratory laparotomy revealed wide-spread abdominal lymphadenopathy. Histologic examination of hepatic and lymph node biopsy specimens revealed chronic granulomatous hepatitis and lymphadenitis. Acid-fast organisms isolated after bacteriologic culturing of a mesenteric lymph node specimen were identified as Mycobacterium smegmatis. Because the prognosis was poor, the dog was euthanatized.
authors.affiliation: Department of Veterinary Clinical Sciences, College of Veterinary Medicine, The Ohio State University, Columbus 43210-1089.
authors.forename: A M
authors.initials: AM
authors.lastname: Grooters
authors.forename: C G
authors.initials: CG
authors.lastname: Couto
authors.forename: J M
authors.initials: JM
authors.lastname: Andrews
authors.forename: S E
authors.initials: SE
authors.lastname: Johnson
authors.forename: J J
authors.initials: JJ
authors.lastname: Kowalski
authors.forename: R B
authors.initials: RB
authors.lastname: Esplin
mesh_terms: D000818:Animals; D001707:Biopsy, Needle / Q000662:veterinary; D003937:Diagnosis, Differential; D004283:Dog Diseases / Q000175:diagnosis / Q000382:microbiology*; D004285:Dogs; D005260:Female; D008198:Lymph Nodes / Q000382:microbiology / Q000473:pathology; D009165:Mycobacterium Infections, Nontuberculous / Q000175:diagnosis / Q000382:microbiology / Q000662:veterinary*; D009170:Nontuberculous Mycobacteria / Q000302:isolation & purification*