Clinical outcome in 20 cases of lingual hemangiosarcoma in dogs: 1996-2011.

With the exception of solar-induced dermal hemangiosarcoma (HSA), the biologic behaviour of canine HSA is characterised by rapid tumour growth, a high metastatic rate and short survival times. Outcome of dogs with HSA of the tongue has not been previously reported. The purpose of this study was to assess outcome and prognostic factors in dogs with lingual HSA. Clinical data was collected retrospectively and histopathology was reviewed for 20 dogs. Median progression free survival was 524 days and the median overall survival time was 553 days. All dogs had low or intermediate grade tumours; most tumours were small and located on the ventral surface of the tongue. Prognostic factors significantly associated with increased survival included small tumour size and absence of clinical signs of an oral mass at the time of diagnosis. Dogs with HSA confined to the tongue may have a better prognosis compared with HSA in other organs.