A 36-year-old male was admitted to our hospital with sudden dyspnea. He had a history of laryngeal papillomata and had undergone 20 laryngeal microsurgeries. The patient’s medical history was otherwise unremarkable. High-resolution computed tomography showed multiple polypoid lesions bulging into the lumen of the trachea and left main bronchus (
Fig. 1G, H). Bronchoscopy revealed severely progressive papillomata throughout the central airway (
Fig. 1A). Pathologic examination revealed squamous papilloma with moderate dysplasia (
Fig. 1I) and a polymerase chain reaction assay revealed human-papilloma-virus type 11, which triggers recurrent respiratory papillomatosis (RRP) [
1]. Consequently, a diagnosis of RRP was confirmed. The bulky papillomata necessitated tracheostomies and a series of cryotherapies under conscious sedation. A 2.4-mm cryoprobe was used (Erbokryo CA; Erbe Elektromedizin GmbH, Tübingen, Germany). After four cryotherapy sessions at one-week intervals, papillomata were removed from the trachea and main carina (
Fig. 1B, C). Therefore, the follow-up intervals were lengthened. However, papillomata relapsed at multiple sites in the trachea (
Fig. 1D) and four months after the last cryotherapy session, RRP was severely exacerbated (
Fig. 1E). The severity of laryngeal stenosis and dyspnea also increased. Thus, additional cryotherapy sessions were performed for three months at three-day to two-week intervals. After treatment, the patient reported substantial abatement of dyspnea (
Fig. 1F). To date, the patient has undergone 21 cryotherapy treatments and receives regular follow-up outpatient care. This clinical experience highlights the effectiveness of cryotherapy among several possible treatments for RRP, although no clear treatment guidelines have been established for this disease [
2]. Herein, we report a case of successful management of severely progressive RRP with repetitive cryotherapy.
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