Abstract
An 8-month-old crossbred Labrador retriever was presented with a history and clinical signs suggestive of lower urinary tract obstruction. Laboratory results revealed azotaemia and hyperphosphataemia. Ultrasonographic evaluation of the urinary tract showed a mass at the bladder trigone, hydronephrosis, hyrodureter, and suspected metastases to lymph nodes and the liver. Pulmonary metastasis was identified on thoracic radiographs. A post mortem confirmed metastases to the liver, lungs and regional lymph nodes, as well as to the mesenteric lymph nodes, mediastinum, heart, subcutaneous tissue and several muscle groups. A histopathological diagnosis of metastatic botryoid rhabdomyosarcoma (sarcoma botryoides) was made. A review of the literature shows that, although the bladder trigone is a well documented location for this tumour, this case was unique with its widespread metastases to previously undocumented organs. The incidence, embryology, ultrasonographic appearance and treatment of this tumour are discussed.
Highlights
Tumours of the urinary bladder represent less than 0.5 % of all primary neoplasms in canine patients
Rhabdomyosarcoma is a rare tumour most commonly occurring in large-breed dogs under 2 years of age, Saint Bernards[2,6,7,10,12], several cases have been reported in Retrievertype dogs[1,2,17]
It is similar to embryonal rhabdomyosarcoma in humans[19], the most common soft tissue tumour in children under 15 years of age.[10]
Summary
Tumours of the urinary bladder represent less than 0.5 % of all primary neoplasms in canine patients.
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