title: Pyomyositis caused by Streptococcus pneumoniae after allogeneic hematopoietic stem cell transplantation.
abstract: Pyomyositis is classified into two main types: tropical and non-tropical. Non-tropical pyomyositis occurs among various immunocompromised patients, and Staphylococcus aureus has been reported as the most common pathogen. Pyomyositis caused by Streptococcus pneumoniae is uncommon, and has not been previously reported after allogeneic hematopoietic stem cell transplantation (allo-HSCT). Here, we report a unique case with pyomyositis caused by S. pneumoniae in the bilateral erector spinae muscles 34 months after allo-HSCT. The patient had an initial clinical response following the administration of intravenous benzylpenicillin potassium for 4 weeks. Although S. pneumoniae bacteremia is a rare bacterial infection after HSCT, the possibility of pyomyositis must be considered when a recipient develops S. pneumoniae bacteremia. Accurate diagnosis and the selection of appropriate antibiotics are necessary for the treatment of pyomyositis.
authors.affiliation: Hematology Division, Tokyo Metropolitan Cancer and Infectious Diseases Center, Komagome Hospital, Japan.
authors.forename: Shuhei
authors.initials: S
authors.lastname: Kurosawa
authors.affiliation: Hematology Division, Tokyo Metropolitan Cancer and Infectious Diseases Center, Komagome Hospital, Japan. Electronic address: n-doki@cick.jp.
authors.forename: Noriko
authors.initials: N
authors.lastname: Doki
authors.affiliation: Department of Clinical Laboratory, Tokyo Metropolitan Cancer and Infectious Diseases Center, Komagome Hospital, Japan.
authors.forename: Noritaka
authors.initials: N
authors.lastname: Sekiya
authors.affiliation: Hematology Division, Tokyo Metropolitan Cancer and Infectious Diseases Center, Komagome Hospital, Japan.
authors.forename: Yasushi
authors.initials: Y
authors.lastname: Senoo
authors.affiliation: Department of Radiology, Tokyo Metropolitan Cancer and Infectious Diseases Center, Komagome Hospital, Japan.
authors.forename: Syuzo
authors.initials: S
authors.lastname: Ikuta
authors.affiliation: Department of Radiology, Tokyo Metropolitan Cancer and Infectious Diseases Center, Komagome Hospital, Japan.
authors.forename: Yasunobu
authors.initials: Y
authors.lastname: Takaki
authors.affiliation: Hematology Division, Tokyo Metropolitan Cancer and Infectious Diseases Center, Komagome Hospital, Japan.
authors.forename: Kazuteru
authors.initials: K
authors.lastname: Ohashi
mesh_terms: D000328:Adult; D000900:Anti-Bacterial Agents / Q000627:therapeutic use; D016470:Bacteremia / Q000188:drug therapy / Q000209:etiology / Q000382:microbiology; D018380:Hematopoietic Stem Cell Transplantation / Q000009:adverse effects*; D006801:Humans; D008297:Male; D052880:Pyomyositis / Q000188:drug therapy / Q000209:etiology* / Q000382:microbiology*; D013203:Staphylococcal Infections / Q000150:complications* / Q000188:drug therapy; D013296:Streptococcus pneumoniae / Q000187:drug effects / Q000472:pathogenicity*
chemical_list: D000900:Anti-Bacterial Agents
keywords: Allogeneic hematopoietic stem cell transplantation; Pyomyositis; Streptococcus pneumoniae