Concurrent enchondroma and periosteal chondroma of the humerus mimicking chondrosarcoma.
A case of concurrent enchondroma and periosteal chondroma of the right proximal humerus in a 19-year-old woman is reported. Radiographs and CT scans showed a periosteal lesion with saucerization and spicula-like mineralization of the lateral aspect of the right proximal humerus and an ill-defined irregular lucency with stippled calcifications of the medullary cavity adjacent to it. MRI showed a long intramedullary lesion in addition to the surface lesion. There was no cortical disruption by imaging and gross examination. Histologically, both lesions showed benign cartilaginous tumors; concurrent enchondroma and periosteal chondroma of the humerus was therefore diagnosed. This combination in the same bone in a patient without enchondromatosis is exceedingly rare. Radiographic features may be confused with chondrosarcoma.
Department of Pathology, Faculty of Medicine, University of Tokyo, Japan.
T
T
Ishida
T
T
Iijima
T
T
Goto
H
H
Kawano
R
R
Machinami
D000328:Adult; D001706:Biopsy; D001859:Bone Neoplasms / Q000175:diagnosis* / Q000473:pathology; D002813:Chondrosarcoma / Q000175:diagnosis* / Q000473:pathology; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D006811:Humerus / Q000473:pathology; D008279:Magnetic Resonance Imaging; D009378:Neoplasms, Multiple Primary / Q000175:diagnosis* / Q000473:pathology; D014057:Tomography, X-Ray Computed