Urethral transitional cell carcinoma in a cat

Ultrasound characteristics of feline urinary bladder transitional cell carcinoma are similar to canine urinary bladder transitional cell carcinoma

Feline transitional cell carcinoma (TCC) is a rare neoplasia of cats with an estimated prevalence of 0.18%. Cats with TCC share clinical signs with common pathologies like feline idiopathic cystitis or urinary tract infections. Nonspecific clinical signs include hematuria, pollakiuria, or stranguria. The literature lacks a feline-specific ultrasound description of TCC. The aim of this multicenter retrospective descriptive study was to report ultrasound findings of a collection of feline TCC and then assess if feline TCC and canine TCC have similar ultrasound appearances. It was hypothesized that the ultrasound characteristics would be similar between feline and canine TCC. Ultrasound studies were assessed for tumor shape, number of isolated mural masses, location within the bladder, presence of Doppler signal, echogenicity of urine, mineralization within the mass, extension of the mass into the proximal urethra or ureters, urethral/ureteral obstruction, pyelectasia, and sublumbar lymphadenopathy. Feline studies were compared to 20 cases of confirmed canine TCC. A total of 20 cats with histologically or cytologically confirmed diagnosis of TCC were included. Feline and canine TCC had similarities when viewed using ultrasound. Statistically significant differences were identified for location of the bladder mass (cats were more likely to be mid-body vs trigonal in dogs, P = .011) and urethral extension of the tumor was less likely in cats than dogs (P = .0436). Based on this sample of 20 cats, feline TCC was most commonly a singular, broad-based mass within the mid-body or apex of the urinary bladder.

Adenocarcinoma of the disseminated prostate in a cat

An adenocarcinoma of the disseminated prostate gland with pulmonary, myocardial and renal metastases is described in a 12-year-old, neutered male European cat. Histologically, the tumour was localised in the spongy layer of the prostatic urethra and showed an epithelial alveolar pattern. Considering the anatomic, microscopic and immunohistochemical findings, the tumour was diagnosed as an adenocarcinoma of the disseminated prostate gland. To our knowledge this is the first report of adenocarcinoma of the disseminated prostate gland in a cat.

Clinical signs, treatments, and outcome in cats with transitional cell carcinoma of the urinary bladder: 20 cases (1990–2004)

OBJECTIVE

To characterize demographics and clinical signs and evaluate outcomes of treatments in cats with transitional cell carcinoma (TCC) of the urinary bladder.

DESIGN

Retrospective case series.

ANIMALS

20 cats with TCC.

PROCEDURES

Medical records of 20 cats with a bladder mass identified as a TCC that were examined at 2 veterinary institutions between 1990 and 2004 were evaluated. Signalment, treatments, and outcome were assessed.

RESULTS

Breeds included domestic short hair (n=14), long hair (2), and medium hair (2) cats, Siamese (1), and Abyssinian (1). All cats had been neutered at an early age (< 1 year old; 13 neutered males and 7 spayed females). The median age at diagnosis of TCC was 15.2 years. The trigone region was affected in 9 cats. Treatments included piroxicam administration, chemotherapy, or surgery as single interventions or in combination; 6 cats were not treated. At the time of diagnosis, 3 cats had pulmonary metastasis and 1 cat had metastasis to local lymph nodes. Median survival time for all 20 cats was 261 days. Nearly all deaths were attributable to progressive disease in the urinary tract. Five cats were lost to follow-up.

CONCLUSIONS AND CLINICAL RELEVANCE

In cats, TCC of the urinary bladder appears to be a rare and aggressive disease that is more prevalent in male cats and frequently develops at sites distant from the trigone (unlike TCC in dogs). Nevertheless, initial clinical signs of TCC in cats in this study were similar to those reported for affected dogs.