title: What is your diagnosis? Large mass in the left caudal portion of the thorax, with cranial displacement of the left cranial lung lobe and pleural effusion.
authors.affiliation: Department of Clinical Studies, School of Veterinary Medicine, University of Pennsylvania, Philadelphia 19104, USA.
authors.forename: Van W
authors.initials: VW
authors.lastname: Knox
authors.forename: Garrett J
authors.initials: GJ
authors.lastname: Davis
authors.forename: H Mark
authors.initials: HM
authors.lastname: Saunders
mesh_terms: D000818:Animals; D003937:Diagnosis, Differential; D004283:Dog Diseases / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000601:surgery; D004285:Dogs; D017809:Fatal Outcome; D005260:Female; D005354:Fibrosarcoma / Q000175:diagnosis / Q000601:surgery / Q000662:veterinary*; D009364:Neoplasm Recurrence, Local; D013902:Radiography, Thoracic / Q000662:veterinary; D013899:Thoracic Neoplasms / Q000175:diagnosis / Q000601:surgery / Q000662:veterinary*; D014463:Ultrasonography