title: Hemophilia B diagnosed by hematoma at the columella base.
authors.forename: Masamitsu
authors.initials: M
authors.lastname: Kuwahara
authors.forename: Satoshi
authors.initials: S
authors.lastname: Yurugi
authors.forename: Maiko
authors.initials: M
authors.lastname: Takeda
authors.forename: Kazuyoshi
authors.initials: K
authors.lastname: Fukuda
authors.forename: Akira
authors.initials: A
authors.lastname: Yoshioka
mesh_terms: D002675:Child, Preschool; D015897:Comorbidity; D005164:Factor IX / Q000627:therapeutic use*; D006406:Hematoma / Q000453:epidemiology / Q000209:etiology*; D002836:Hemophilia B / Q000175:diagnosis* / Q000453:epidemiology; D006801:Humans; D022125:Lacerations / Q000150:complications* / Q000453:epidemiology; D008297:Male; D009666:Nose / Q000293:injuries*
chemical_list: D005164:Factor IX