Cytologic identification of immature endospores in a dog with rhinosporidiosis.
An 8-year-old, intact, male Labrador Retriever was presented to the Boren Veterinary Medical Teaching Hospital at Oklahoma State University with a 2-month history of severe sneezing episodes that resulted in epistaxis and bilateral sanguineous discharge. Rhinoscopy revealed a small polypoid mass, and specimens were obtained for histopathology. Microscopic examination of formalin-fixed tissue specimens revealed organisms consistent with Rhinosporidium seeberi. The mass was surgically excised and impression smears were made for cytology examination. Smears revealed high numbers of endospores, typical of those previously described for R seeberi. In addition, numerous smaller structures, presumed to be immature endospores, were noted. The immature endospores were morphologically distinct from mature endospores and have not been described previously. Recognition of immature forms of Rhinosporidium may help prevent misidentification of the organism or misdiagnosis of a dual infection.
Meier
William A
WA
Department of Veterinary Pathobiology, College of Veterinary Medicine, Oklahoma State University, Stillwater, OK, USA. william.meier@covance.com
Meinkoth
James H
JH
Brunker
Jill
J
Cunningham
Debbie
D
Bahr
Robert J
RJ
D000818:Animals; D000935:Antifungal Agents / Q000627:therapeutic use; D003937:Diagnosis, Differential; D004283:Dog Diseases / Q000175:diagnosis / Q000382:microbiology / Q000473:pathology* / Q000601:surgery; D004285:Dogs; D008297:Male; D009296:Nasal Cavity / Q000382:microbiology / Q000473:pathology; D009298:Nasal Polyps / Q000175:diagnosis / Q000382:microbiology / Q000473:pathology / Q000662:veterinary; D009668:Nose Diseases / Q000175:diagnosis / Q000382:microbiology / Q000473:pathology / Q000662:veterinary*; D012227:Rhinosporidiosis / Q000175:diagnosis / Q000382:microbiology / Q000473:pathology / Q000662:veterinary*; D012228:Rhinosporidium / Q000302:isolation & purification; D013172:Spores, Fungal / Q000302:isolation & purification; D016896:Treatment Outcome
D000935:Antifungal Agents