• Tomohiko Ishikawa, Jun Suzuki, Tsuyoshi Shirai, Shotaro Koizumi, Yoshinori Tsuchiya, Kasumi Hishinuma, Yasuhiro Nakamura, and Yukio Katori.
• Department of Otorhinolaryngology, Japan Community Health Care Organization (JCHO) Sendai Hospital.
• Tohoku J. Exp. Med. 2022 Aug 5; 258 (1): 29-34.

AbstractAlthough nasal septal abscesses are uncommon, their cosmetic complications can be severe. Hence, prompt diagnosis and treatment are important. Here, we report a case of aseptic nasal septal abscess in a patient with proteinase 3-antineutrophil cytoplasmic antibody (PR3-ANCA)-positive ulcerative colitis (UC), in which phlebitis was observed and granulomatosis with polyangiitis (GPA) might co-exist. A 27-year-old female suffered from intermittent abdominal pain and diarrhea for several years. She visited our hospital complaining of worsening swelling and pain in the middle forehead and fever lasting 2 weeks. Physical examination and computed tomography revealed severe swelling of the nasal septum. The patient was diagnosed with nasal septal abscess, and incision drainage and biopsy from the bilateral nasal septum were performed, which showed severe ulcerative neutrophilic mucositis with phlebitis. Simultaneously, blood examination yielded slight positivity for PR3-ANCA. Colonoscopy, including biopsy, revealed severe inflammation without vasculitis nor granuloma, which led to the diagnosis with PR3-ANCA-positive UC. Phlebitis in the nasal mucosa and elevated PR3-ANCA suggested co-existing GPA; hence, she was treated with glucocorticoids and rituximab. Following treatment, the nasal septal abscess and digestive symptoms disappeared. She was discharged on day 25 without symptom recurrence or major nasal deformity. For the prevention of nasal deformity due to persistent inflammation, prompt administration of immunosuppressive therapy should be considered with adequate evaluations for systemic diseases, including UC and GPA.

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