title: Case of angiosarcoma of the nasal passage of the horse--ultrastructure and differential diagnosis from progressive haematoma.
abstract: An angiosarcoma involving the right frontal and maxillary sinuses in a nine-year-old Thoroughbred mare was studied post mortem by light and electron microscopy. Important diagnostic features included malignant endothelial cells lining ill-defined vascular spaces, supported by other vasoformative elements. Rhabdomyoblasts were also found. The tumour is apparently rarely seen in the nasal passages of the horse.
mesh_terms: D000818:Animals; D003937:Diagnosis, Differential; D005260:Female; D005626:Frontal Sinus; D006394:Hemangiosarcoma / Q000175:diagnosis / Q000473:pathology / Q000648:ultrastructure / Q000662:veterinary*; D006406:Hematoma / Q000175:diagnosis / Q000662:veterinary*; D006734:Horse Diseases / Q000175:diagnosis* / Q000473:pathology; D006736:Horses; D008444:Maxillary Sinus Neoplasms / Q000175:diagnosis / Q000473:pathology / Q000648:ultrastructure / Q000662:veterinary*; D010255:Paranasal Sinus Neoplasms / Q000175:diagnosis / Q000473:pathology / Q000648:ultrastructure / Q000662:veterinary*