Affiliations: Department of Pediatrics, NTT East Sapporo Hospital,
Sapporo, Hokkaido, Japan | Department of Orthopedics, NTT East Sapporo Hospital,
Sapporo, Hokkaido, Japan | Department of Pediatrics, Sapporo Medical University
School of Medicine, Sapporo, Hokkaido, Japan
Note: [] Correspondence: Dr. Toshihiko Mori, MD, PhD, Department of
Pediatrics, NTT East Sapporo Hospital, South 1, West-15, Chuo-ku, Sapporo,
Hokkaido 060-0061, Japan. Tel.: +81 11 623 7240; Fax: +81 11 623 7527; E-mail:
toshihiko_mori@east.ntt.co.jp
Abstract: Pyogenic sacroiliitis is a relatively rare cause of hip pain and
fever. Psoas muscle abscess complicating pyogenic sacroiliitis, has been
reported in some cases; however, piriformis muscle abscess causing sacroiliitis
has never been described. We report a 14-year-old girl who developed a
piriformis muscle abscess associated with pyogenic sacroiliitis due to
methicillin-sensitive Staphylococcus aureus.
Keywords: Pyogenic sacroiliitis, piriformis abscess, magnetic resonance imaging, drainage
