Primary Lymph Node Hemangiosarcoma with Rapid Progression in a Dog

A rare form of hemangiosarcoma originating from the lymph nodes (LN-HSA), characterized by slow progression, has recently been reported in dogs. We herein report a case of LN-HSA in a dog that progressed rapidly. Despite complete surgical removal of the LN-HSA from the right retropharyngeal lymph node, the dog developed additional nodal and splenic lesions within 2 months and died 148 days after surgery.