Computed tomography angiographic findings following gradual occlusion of the dorsal sagittal sinus for definitive excision of a caudal calvarial multilobular tumour of bone in a dog

Multilobular tumour of bone is a rare, slow growing, locally aggressive malignancy in dogs. Surgical resection of the primary tumour is currently the recommended treatment for local disease control. Wide or definitive extent excision to obtain a histologically complete excision is ideal when possible; however, wide excision can be challenging for caudally located calvarial tumours in which the excision will include removal of the confluence of the two transverse sinuses and dorsal sagittal sinus. Acute sacrifice to the dorsal sagittal sinus has the potential for fatal cerebral oedema. To manage this risk, gradual occlusion of the dorsal sagittal sinus before wide excision of caudally located multilobular tumour of bones has been successfully reported in two patients. The current case report documents another successfully managed case with this technique, and includes the computed tomography angiographic findings during the gradual occlusion process.