Causes
A malignant tumour of the blood vessels. Predisposed breeds: German Shepherd, Golden Retriever, Labrador. More common in older dogs.
Diagnosis
Ultrasound and X-rays detect the masses. It is often diagnosed during a bleeding crisis. Biopsy confirms the diagnosis.
Treatment
Surgery (e.g. removing the spleen) plus chemotherapy. The prognosis is guarded due to the tendency to bleed and metastasise. Managing the dog's quality of life is a priority.
Prevention
Not preventable. Ultrasound scans during senior health checks in at-risk breeds may detect masses before a crisis.

