Systemic Mycobacterium smegmatis infection in a dog.
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.
Grooters
A M
AM
Department of Veterinary Clinical Sciences, College of Veterinary Medicine, The Ohio State University, Columbus 43210-1089.
Couto
C G
CG
Andrews
J M
JM
Johnson
S E
SE
Kowalski
J J
JJ
Esplin
R B
RB
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*