抄録
We report here a case of periosteal chondroma and discuss the characteristics of this tumor. The patient was a 62-year-old woman who complained of swelling on the ulnar side of the left index finger without any other symptoms. Roentgenography revealed a tumor shadow with clear margins and calcification on the ulnar side of the middle phalanx of the index finger. This tumor compressed the bone cortex, resulting in an impression. The tumor was enucleated with its capsule connecting to the periosteum, and the underlying cortical bone was abraded. Histological examination revealed no nuclear atypia, and the diagnosis was chondroma. There has been no evidence of recurrence for 10 months after operation.
Periosteal chondroma is a relatively rare tumor in Japan, and only 160 cases of it had been reported to the Japan Bone Tumor Registry by 1991; the origin of 48 of those cases was the phalanx. The histological findings of periosteal chondroma are sometimes similar to those of malignant tumors, and diagnosis must be made after taking all the clinical findings, such as duration of the illness and presence or absence of pain, into consideration. For treatmemt, en block resection including cortical bone has been recommended in many reports, but we believe that enucleation with tumor capsule and abrasion of the underlying cortical bone are sufficient.
