Splenic sarcoma and carcinoma collision tumour in a dog

Authors: Tena A, Fry DR
Publication: Australian Veterinary Practitioner, Volume 53, Issue 4, pp 123-127, Oct 2023
Publisher: Australian Veterinary Association

Animal type: Dog
Article class: Clinical Article

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Abstract:

Collision tumours are rare in dogs. There is currently minimal information regarding treatment recommendations and prognosis.

An 11.5-year-old neutered male Greyhound was presented for routine screening following a right pelvic limb amputation for a tibial osteosarcoma and adjuvant carboplatin chemotherapy four years previously. An abdominal ultrasound identified a splenic and left adrenal gland mass. The dog underwent an exploratory laparotomy with splenectomy and left adrenalectomy. Histopathology of the adrenal mass was consistent with a phaeochromocytoma. Splenic mass histopathology was consistent with a collision tumour involving a high grade visceral soft tissue sarcoma and metastatic carcinoma. The dog remained clinically stable until four months postoperatively when the dog deteriorated clinically and was euthanased. To the authors’ knowledge, this is the first case report of a splenic collision tumour involving a soft tissue sarcoma and carcinoma. Collision tumours should be considered in the differential diagnosis of a splenic mass in dogs.

Keywords: collision tumour; spleen; canine; visceral soft tissue sarcoma; carcinoma

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