title: A massive chondroblastoma in the proximal humerus simulating malignant bone tumors.
abstract: Chondroblastoma is a mostly benign bone neoplasm that typically affects the second decade of life and exhibits a lytic lesion in the epiphysis of long bones. We report an extreme case of massive, destructive chondroblastoma of the proximal humerus in a 9-year-old girl. It was difficult to differentiate using imaging information the lesion from malignant bone tumors such as osteosarcoma. Histopathological examination from biopsy proved chondroblastoma. The tumor was resected after preoperative transcatheter embolization. Reconstructive procedure for the proximal humerus was not performed due to the local destruction. The present case demonstrates clinical and radiological differentiations of the massive chondroblastoma from the other lesions and histopathological understandings for this lesion.
authors.affiliation: Department of Orthopedics, Institute of Health Biosciences, The University of Tokushima, Japan.
authors.forename: Ichiro
authors.initials: I
authors.lastname: Tonogai
authors.forename: Mitsuhiko
authors.initials: M
authors.lastname: Takahashi
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Manabe
authors.forename: Toshihiko
authors.initials: T
authors.lastname: Nishisho
authors.forename: Seiji
authors.initials: S
authors.lastname: Iwamoto
authors.forename: Shoichiro
authors.initials: S
authors.lastname: Takao
authors.forename: Seiko
authors.initials: S
authors.lastname: Kagawa
authors.forename: Eiji
authors.initials: E
authors.lastname: Kudo
authors.forename: Natsuo
authors.initials: N
authors.lastname: Yasui