Cytogenetic analysis of a low-grade secondary peripheral chondrosarcoma arising in synovial chondromatosis.

Secondary chondrosarcoma is a malignant chondroid tumor arising in a benign precursor. Synovial chondromatosis is a benign chondroid lesion that rarely transforms to chondrosarcoma. We present the case of a 54-year-old male with the diagnosis of low-grade secondary peripheral chondrosarcoma developed in the context of synovial chondromatosis. Cytogenetics revealed a novel aberration t(1;14)(q23.1~24;q24.1~3). Multicolor banding (mBAND) analysis described the chromosomal regions involved in this translocation with a higher detail. Diagnosis of such borderline lesions is very difficult and cytogenetics is helpful in characterizing these tumors.