Background:
Renal neoplasms are a rare condition in felines, with metastatic
lymphoma presenting the highest incidencerate.
Secondary renal neoplasms are more frequent (88%) than primary renal
tumors, with primary mesenquimal renalneoplasms
accounting for 22% of the cases and the
incidence of benign
tumors not exceeding 5%.
Myxomas are neoplasmsin undifferentiated mesenchymal
cells with abundant
reproduction of the myxoid matrix, with few few
case reports aboutthis type of
neoplasm in the
veterinary literature. This study
reports the first case of renal
myxoma in a young feline afflicted by granulomatous
nephritis and diagnosed with FIP (
Feline Infectious Peritonitis).Case A 9-month-old,
male, mixed breed feline, was admitted into the
Veterinary Hospital maintained by the Schoolof
Veterinary Medicine and
Animal Science, Botucatu,
Brazil, presenting symptoms such progressive
weight loss andoccasional episodes of
emesis for one week, progressing to
anorexia,
hematochezia, vocalization,
lack of coordination,
spasms,
anuria and inability to defecate. A
physical examination revealed moderate
dehydration, low
temperatures (<33ºC),
dyspnea (36 mpm), slight
hyperglycemia (187 mg/dL) and distension of the
abdomen and of the
urinary bladder.The hematological assay and the
serum biochemistry assay revealed neutrophilic
leukocytosis,
thrombocytopenia, anemiaand slight
uremia. In view of the severity of the
neurologic signs and lack of response to the clinical
treatment, the owneropted to euthanize the
animal. The necropsy revealed diffused
jaundice, with
kidney injuries observed through the palecoloration of the
tissue and irregular surface with multiple off-
white small nodules distributed in a marked and diffuseway. The same
injury pattern was observed markedly in the
lungs and discretely in the
spleen and
liver. The material collected was fixed in a 10%
formalin solution, and processed according to the routine
technique (
Hematoxylin &
Eosin)...(AU)