title: Spontaneous regression of osteochondromas.
abstract: Spontaneous regression of an osteochondroma is an infrequent event. In this report, two cases with spontaneous regression of osteochondromas are presented. The first case was a solitary osteochondroma of the pedunculated type involving the right proximal humerus in a 7-year-old boy. This lesion resolved over 15 months of observation. The second case was a 3-year-old girl with multiple osteochondromatosis, in whom sessile osteochondromas of the right tibia and left fibula regressed over 33 months. The mechanism of this phenomenon is discussed with a review of previous reports. Regarding treatment, careful observation may be acceptable for typical osteochondromas, especially in young children.
authors.affiliation: Department of Orthopaedic Surgery, Yodogawa Christian Hospital, 2-9-26 Awaji, Higashi-Yodogawa-Ku, Osaka, 533-0032, Japan. hoshi@med.osaka-cu.ac.jp
authors.forename: Manabu
authors.initials: M
authors.lastname: Hoshi
authors.forename: Masatsugu
authors.initials: M
authors.lastname: Takami
authors.forename: Ryouji
authors.initials: R
authors.lastname: Hashimoto
authors.forename: Takashi
authors.initials: T
authors.lastname: Okamoto
authors.forename: Ikuhisa
authors.initials: I
authors.lastname: Yanagida
authors.forename: Akira
authors.initials: A
authors.lastname: Matsumura
authors.forename: Kazuko
authors.initials: K
authors.lastname: Noguchi
mesh_terms: D001859:Bone Neoplasms / Q000000981:diagnostic imaging / Q000473:pathology*; D002648:Child; D002675:Child, Preschool; D005260:Female; D005360:Fibula / Q000473:pathology; D006801:Humans; D006811:Humerus / Q000473:pathology; D008297:Male; D015831:Osteochondroma / Q000000981:diagnostic imaging / Q000473:pathology*; D018216:Osteochondromatosis / Q000000981:diagnostic imaging / Q000473:pathology*; D012075:Remission, Spontaneous; D013977:Tibia / Q000473:pathology; D014057:Tomography, X-Ray Computed