title: Temporary regression of locally invasive polypoid rhinosinusitis in a dog after photodynamic therapy.
abstract: A 5-year-old male cross-breed dog with chronic rhinosinusitis was presented. Computed tomography (CT) revealed opacities consistent with soft tissue or fluid in the left nasal cavity and frontal sinus. A diagnosis of chronic rhinosinusitis with myxomatous polyps was based on the histology of biopsy samples, so prednisolone treatment was administered for 1 month. Although the clinical signs slightly improved, no changes were observed on the CT images. At 8 months after the initial presentation, the dog was treated with antivascular photodynamic therapy (PDT) using benzoporphyrin derivative monoacid ring A and, 11 days later, CT revealed remarkably decreased soft tissue opacity; the facial swelling and sneezing also resolved. Three additional sessions of PDT were performed at 114, 210, and 303 days after the first PDT because of recurrence of clinical signs. The disease was well controlled for approximately 10 months by antivascular PDT.
authors.affiliation: Veterinary Teaching Hospital, Graduate School of Veterinary Medicine, Hokkaido University, Sapporo, 060-0818, Japan. tosaki@muses.tottori-u.ac.jp
authors.forename: T
authors.initials: T
authors.lastname: Osaki
authors.forename: S
authors.initials: S
authors.lastname: Takagi
authors.forename: Y
authors.initials: Y
authors.lastname: Hoshino
authors.forename: Y
authors.initials: Y
authors.lastname: Aoki
authors.forename: Y
authors.initials: Y
authors.lastname: Sunden
authors.forename: K
authors.initials: K
authors.lastname: Ochiai
authors.forename: M
authors.initials: M
authors.lastname: Okumura
mesh_terms: D000818:Animals; D004283:Dog Diseases / Q000188:drug therapy*; D004285:Dogs; D008297:Male; D009298:Nasal Polyps / Q000188:drug therapy / Q000662:veterinary*; D010778:Photochemotherapy / Q000662:veterinary*; D017319:Photosensitizing Agents / Q000627:therapeutic use*; D011166:Porphyrins / Q000627:therapeutic use*; D012852:Sinusitis / Q000188:drug therapy / Q000662:veterinary*; D014057:Tomography, X-Ray Computed; D016896:Treatment Outcome
chemical_list: D017319:Photosensitizing Agents; D011166:Porphyrins