Propionibacterium acnes-associated chronic hypertrophic pachymeningitis followed by refractory otitis media: a case report. - Amano, Eiichiro; Uchida, Keisuke; Ishihara, Tasuku; Otsu, Shinichi; Machida, Akira; Eishi, Yoshinobu (BMC Neurology, 2020)