title: Olecranon Osteomyelitis due to Actinomyces meyeri: Report of a Culture-Proven Case.
abstract: Actinomyces meyeri is a Gram positive, strict anaerobic bacterium, which was first described by Meyer in 1911. Primary actinomycotic osteomyelitis is rare and primarily affects the cervicofacial region, including mandible. We present an unusual case of osteomyelitis of a long bone combined with myoabscess due to A. meyeri. A 70-year-old man was admitted for pain and pus discharge of the right elbow. Twenty-five days before admission, he had hit his elbow against a table. MRI of the elbow showed a partial tear of the distal triceps tendon and myositis. He underwent open debridement and partial bone resection for the osteomyelitis of the olecranon. Biopsy showed no sulfur granules, but acute and chronic osteomyelitis. The excised tissue grew A. meyeri and Peptoniphilus asaccharolyticus. Intravenous ceftriaxone was administered and switched to oral amoxicillin. Infection of the extremities of actinomycosis often poses diagnostic difficulties, but it should not be neglected even when the characteristic pathologic findings are not present.
authors.affiliation: Division of Infectious Diseases, Department of Internal Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
authors.forename: Ji Yeon
authors.identifier: http://orcid.org/0000-0002-8713-1497
authors.initials: JY
authors.lastname: Kim
authors.affiliation: Department of Internal Medicine, Gachon University School of Medicine, Gil Medical Center, Incheon, Korea.
authors.forename: Eun Kyung
authors.initials: EK
authors.lastname: Kang
authors.affiliation: Department of Internal Medicine, Gachon University School of Medicine, Gil Medical Center, Incheon, Korea.
authors.forename: Song Mi
authors.initials: SM
authors.lastname: Moon
authors.affiliation: Department of Laboratory Medicine, Gachon University School of Medicine, Gil Medical Center, Incheon, Korea.
authors.forename: Yiel Hea
authors.initials: YH
authors.lastname: Seo
authors.affiliation: Department of Pathology, Gachon University School of Medicine, Gil Medical Center, Incheon, Korea.
authors.forename: Juhyeon
authors.initials: J
authors.lastname: Jeong
authors.affiliation: Department of Pathology, Gachon University School of Medicine, Gil Medical Center, Incheon, Korea.
authors.forename: Hyuni
authors.initials: H
authors.lastname: Cho
authors.affiliation: Department of Physiology, Gachon University School of Medicine, Gil Medical Center, Incheon, Korea.
authors.forename: Dongki
authors.initials: D
authors.lastname: Yang
authors.affiliation: Division of Infectious Diseases, Department of Internal Medicine, National Health Insurance Service Ilsan Hospital, Goyang, Korea. ysparkok2@gmail.com.
authors.forename: Yoon Soo
authors.identifier: http://orcid.org/0000-0003-4640-9525
authors.initials: YS
authors.lastname: Park
keywords: Actinomyces; Olecranon; Osteomyelitis