Myxosarcoma in a wapiti.

Myxosarcoma was diagnosed in an adult male wapiti (Cervus canadensis) from western Colorado. The neoplasm was located on the medial aspect of the right thigh and had extensively infiltrated adjacent soft tissue.     

Multicystic nephroma: a case report

BACKGROUND: Cystic nephroma is an uncommon pediatric renal neoplasm. It needs to be differentiated from cystic partially differentiated nephroblastoma and from other renal neoplasms showing extensive cystic change. It is scantily reported in the cytology literature. CASE: A 7-month-old female with a left-sided abdominal lump was diagnosed as having cystic Wilms' tumor on computed tomography. Fine needle aspiration cytology showed cellular smears composed of monomorphic, round to oval cells, suggestive of a small round cell tumor, possibly rhabdomyosarcoma. However, histopathologic examination showed it to be a multicystic nephroma. On review of the cytologic smears, the blastemal component was absent. CONCLUSION: This case highlights 1 extreme and unexpected cytologic appearance of cystic nephroma; it may result in misdiagnosis.     

A summary of the prevalence of Parelaphostrongylus tenuis in a captive wapiti population.

A total of 87 brains from harvested and collected wapiti and red deer (Cervus spp.) were examined grossly and microscopically between 1973 and 1977 in a 2104 ha. preserve. Prevalence of infection significantly increased from 26.6% of the sample in 1973 to 64.3% in 1975 (P less than .05). A decline to 47.7% in 1977 (P greater than .05) was not significant. However, the number of clinical cases was significantly higher in 1976-1977 (P less than .02) than previously reported in 1973-1975.     

Experimental infection of dogs with Sarcocystis from wapiti.

Ten domestic dogs became infected with Sarcocystis when fed simple portions of heart, esophagus and diaphragm from a two-year-old female wapiti (Cervus canadensis). The prepatent period was 14 days in all exposed dogs; the patent period ranged from 8 to 20 days. Neither the 10 control dogs, nor two dogs fed sporocysts collected from the infected dogs passed sporocysts within the study period. Sporocysts averaged 16.5 by 11.1 micron in size.     

R51163 as a sedative for handling and transporting plains bison and wapiti.

Forty captive wapiti (Cervus elaphus) and thirty-two bison (Bison bison bison) were tested in April and October 1988, respectively, for their response to the sedative R51163. Treatment animals were injected with either 0.1, 0.2, or 0.3 mg of R51163/kg and then observed for 72 hr. Behavior was significantly altered by the drug. Hyperactive, aggressive, and milling behavior was characteristic of treated wapiti and they were extremely dangerous and reared when hind quarters were touched. Although treated plains bison displayed some milling behavior, they were generally more calm than wapiti. There was a marked difference between sexes in plains bison for all behavioral categories. Male bison were more ataxic, often observed in sternal or lateral recumbency, less conscious, and were slower to respond than females or controls. Respiratory rate increased in treated wapiti and plains bison, and heart rates of treated wapiti increased. Because of the powerful sedative effect on large, male bison, R51163 may be useful for handling unmanageable or dangerous animals and warrants further studies.     

Morphology of typanosomes from white-tailed deer and wapiti in Michigan.

Trypanosomes were isolated from a wapiti (Cervus canadensis) and 72 white-tailed deer (Odocoileus virginianus) from several locations in Michigan. Although significantly fewer fawns were infected, there were no significant differences in rate of infection between sexes or among geographic areas. From appearance of the trypomastigote, the trypanosome from white-tailed deer belongs in the genus Trypanosoma and the subgenus Megatrypanum. It was morphometrically similar to the common trypanosome of cattle, Trypanosoma theileri.     

Efficacy of triclabendazole against natural infections of Fascioloides magna in wapiti.

Fourteen free-ranging adult wapiti (Cervus elaphus nelsoni) were captured in Banff National Park, Alberta (Canada) and held in captivity near Edmonton. A 24% suspension of triclabendazole at doses of 30 to 100 mg/kg body weight was drenched into the rumen of eight females and four males. Two male wapiti were used as untreated controls. Animals were killed and examined at 4 (n = 3), 6 (n = 4), or 8 (n = 4) wk after treatment. Efficacy was 90% against immature Fascioloides magna collected 4 wk after treatment and 98% against adult flukes collected 4, 6 or 8 wk after treatment. All 32 flukes recovered from control wapiti were active and apparently healthy. Treatment at 50 to 60 mg/kg is recommended against F. magna in wapiti. A protocol for treating infected wapiti is outlined.     

Cytology of cystic nephroma: a case report

BACKGROUND: Cystic nephroma is a rare benign multiloculated cystic renal neoplasm that is often confused with multicystic renal cell carcinoma radiographically and cytologically. CASE: A 58-year-old woman was incidentally found to have a multiloculated cystic right renal lesion. Cytologic examination of the fluid aspirated from the lesion was reported as highly suspicious for renal cell carcinoma, but a right nephrectomy revealed a cystic nephroma. CONCLUSION: Cystic nephroma fluid is characterized by the presence of sparse epithelial cells with moderate nuclear atypia. Conversely, the fluid of multicystic renal cell carcinoma is moderately cellular with no or mild nuclear atypia.     

Diseases of wapiti utilizing cattle range in southwestern Alberta

Specimens from 28 wapiti (Cervus elaphus canadensis) were collected by hunters in southwestern Alberta in 1984. Various tests were performed to detect infections and conditions that could affect cattle sharing the range or cause disease in wapiti. Serum antibodies were present against leptospiral serovars autumnalis (25%), bratislava (4%), and icterohaemorrhagiae (8%), and the viruses of bovine virus diarrhea (52%), infectious bovine rhinotracheitis (45%), and parainfluenza type 3 (13%). No serological evidence of bovine respiratory syncytial virus, Brucella, Anaplasma, bluetongue virus, or epizootic hemorrhagic disease virus was found, nor were any lesions of vesicular diseases, necrotic stomatitis or nutritional myopathy evident. Focal interstitial nephritis and sarcocystosis were diagnosed histologically in 40% and 75%, respectively, of the wapiti tested. The prevalence of giant liver flukes (Fascioloides magna) was 50% and of lungworms (Dictyocaulus viviparus) 32%. Leptospiral serology on cattle in the area did not indicate that wapiti or cattle were a serious source of infection to each other. The giant liver fluke was the parasite most likely to be amplified by wapiti for cattle. Within the limits of this study, the results indicated that wapiti in the Waterton area do not pose a disease threat to the cattle with which they range, but periodic observational studies in these wapiti would be a useful means of early detection of any changes in the interspecies relationship.     

Yersiniae in the soil of an infected wapiti range

Yersinia enterocolitica was isolated from 10 of 121 soil samples from an area inhabitated by infected wapiti (Cervus elaphus roosevelti) in northwest California. Significantly (p less than 0.05) more soil samples from a forest habitat were infected, compared to soil samples from prairie habitats. Soil was found infected with yersiniae only on dates for which rainfall in excess of 17 mm had occurred during the previous 7 days.     

Fine needle aspiration cytology of mesoblastic nephroma. A case report.

A case of congenital mesoblastic nephroma of the left kidney was diagnosed in a 4-month-old child by fine needle aspiration cytology. The smears consisted of clustered and dyshesive spindle cells with minimal nuclear atypia and mitosis. No epithelial, tubular or glomeruloid differentiation was noted. Considering the age and cytomorphology, a diagnosis of mesoblastic nephroma was made. Histopathology of the nephrectomy specimen showed a tumor with features of atypical mesoblastic nephroma. Cytologic diagnosis of mesoblastic nephroma is important because the tumor has an excellent prognosis, and unlike Wilms' tumor, requires only surgery.