Hemothorax associated with telangiectatic osteosarcoma in a dog.
Hemothorax in a dog was attributed to bleeding from an intrathoracic mass attached to the sixth through the tenth ribs. The mass contained numerous cavernous, blood-filled spaces as well as bands of osteoid and occasional foci of osseous tissue. The diagnosis was telangiectatic osteosarcoma. Telangiectatic osteosarcoma is an uncommon variant of osteosarcoma. Cavernous, blood-filled spaces and paucity of bone are important histologic features. Metastasis was described in one of the seven telangiectatic osteosarcomas reported in dogs, and none was found in this case.
D000818:Animals; D003238:Connective Tissue / Q000473:pathology; D004283:Dog Diseases / Q000473:pathology*; D004285:Dogs; D006491:Hemothorax / Q000209:etiology / Q000662:veterinary*; D008297:Male; D012516:Osteosarcoma / Q000150:complications / Q000473:pathology / Q000662:veterinary*; D013899:Thoracic Neoplasms / Q000150:complications / Q000473:pathology / Q000662:veterinary*