Angiofibroma in the frontal sinus of a dog.
D000818:Animals; D004283:Dog Diseases; D004285:Dogs; D005260:Female; D005626:Frontal Sinus; D018219:Histiocytoma, Benign Fibrous / Q000662:veterinary*; D012888:Skull Neoplasms / Q000662:veterinary*