Abstract
Pseudomonas aeruginosa (P. aeruginosa) infection, often diagnosed in immunocompromised patients, is a chronic disease. However, peritonsillar and deep cervical abscesses caused by P. aeruginosa are rare. We herein present the rare case of a 70-year-old male patient with a 5-day history of sore throat and difficult oral intake. The oral cavity was filled with pus and the left palatine tonsil was destroyed. A peritonsillar abscess caused by P. aeruginosa was diagnosed using a pus culture. Emergency incisions were made for tonsil drainage, tracheostomy, and antibacterial drug treatment. Despite infection resolution in 20 days, recovery from swallowing dysfunction required one year of rehabilitation.