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The distinction between benign and malignant cartilaginous tumors located peripherally in the bone may be a challenging task in surgical pathology. The aim of this study was to investigate interobserver reliability in histological diagnosis of cartilaginous tumors in the setting of multiple osteochondromas and to evaluate possible histological parameters that could differentiate among osteochondroma, low- and high-grade secondary peripheral chondrosarcoma. Interobserver reliability was assessed by 12 specialized bone-tumor pathologists in a set of 38 cases. Substantial agreement on diagnosis among all the reviewers was observed (intraclass correlation coefficient=0.78). Our study confirmed that mitotic figures and nuclear pleomorphism are hallmarks of high-grade secondary peripheral chondrosarcoma. However, despite the substantial agreement, we demonstrated that histology alone cannot distinguish osteochondroma from low-grade secondary peripheral chondrosarcoma in the setting of multiple osteochondromas, as nodularity, the presence of binucleated cells, irregular calcification, cystic/mucoid changes and necrosis were not helpful to indicate malignant transformation of an osteochondroma. On the other hand, among the concordant cases, the cartilage cap in osteochondroma was significantly less thicker than in low- and high-grade secondary peripheral chondrosarcoma. Therefore, our study showed that a multidisciplinary approach integrating clinical and radiographical features and the size of the cartilaginous cap in combination with a histological assessment are crucial to the diagnosis of cartilaginous tumors.

Original publication

DOI

10.1038/modpathol.2012.78

Type

Journal article

Journal

Modern pathology : an official journal of the United States and Canadian Academy of Pathology, Inc

Publication Date

09/2012

Volume

25

Pages

1275 - 1283

Addresses

Department of Pathology, Leiden University Medical Center, Leiden, The Netherlands.

Keywords

Cartilage, Cell Nucleus, Chondrocytes, Humans, Chondrosarcoma, Exostoses, Multiple Hereditary, Bone Neoplasms, Observer Variation, Reproducibility of Results, Adolescent, Adult, Middle Aged, Child, Female, Male, Young Adult