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Summary A 7-year-old neutered male domestic shorthair cat was presented with chronic lameness in the right forelimb. A cystic bony lesion was identified in the distal right humerus and amputation was performed. The epiphyseal trabecular bones of the capitulum and trochlea was replaced by a tan to pink, expansile mass that was surrounded by a thin rim of cortical bone. Microscopically, the tumour was composed of a bland, osteoid producing spindle cell population within a well-vascularized fibrous stroma. Radiographical and histological features were consistent with osteoblastoma. Osteoblastoma and the related osteoid osteoma are uncommon, benign osteoblastic tumours that are reported rarely in animals. These tumours should be considered as differential diagnoses for slow growing, cystic bony lesions in cats.

A 9-week-old male puppy was submitted for necropsy examination after a reported history of developing acute melaena and vomiting blood before death. Grossly, the animal had multiple skull fractures, mostly affecting the occipital region and cranial floor, associated with extensive regions of subcutaneous, periosteal and subdural haemorrhages, as well as petechial haemorrhages within the right middle and caudal lung lobes. Histopathology of the brain revealed multifocal acute meningeal and parenchymal haemorrhage with laceration of the cerebellar folia. In the lung, multiple small- and medium-calibre branches of pulmonary arteries were occluded by aggregates of brain tissue, which exhibited weak immunoreactivity for glial fibrillary acidic protein and strong labelling for neuron specific enolase on immunohistochemistry. These findings were consistent with brain tissue pulmonary embolism, an infrequent phenomenon following severe head trauma. To the best of the authors' knowledge, this is the first reported case of canine brain tissue pulmonary embolism.