title: What is your diagnosis? Spherical soft tissue opacity in the area of the distal portion of the trachea.
mesh_terms: D000818:Animals; D003490:Cyanosis / Q000209:etiology / Q000662:veterinary*; D004283:Dog Diseases / Q000000981:diagnostic imaging* / Q000209:etiology / Q000601:surgery; D004285:Dogs; D004417:Dyspnea / Q000209:etiology / Q000662:veterinary*; D005260:Female; D005547:Foreign Bodies / Q000150:complications / Q000000981:diagnostic imaging / Q000601:surgery / Q000662:veterinary*; D005548:Foreign-Body Migration / Q000000981:diagnostic imaging / Q000601:surgery / Q000662:veterinary; D013902:Radiography, Thoracic / Q000662:veterinary; D014132:Trachea / Q000000981:diagnostic imaging / Q000473:pathology