J Korean Soc Radiol.  2014 Mar;70(3):217-220. 10.3348/jksr.2014.70.3.217.

Extraskeletal Chondroma Causing Carpal Tunnel Syndrome: A Case Report

• Kim OH
• Kim YM

• KMID: 1839436
• DOI: http://doi.org/10.3348/jksr.2014.70.3.217

Abstract

Carpal tunnel syndrome caused by extraskeletal chondroma has been scarcely reported in the literature. Authors report a case of carpal tunnel syndrome as a result of an extraskeletal chondroma arising within the carpal tunnel, and describe the radiological and pathological findings of the mass. We also discuss the differential diagnosis of the calcified space, occupying lesions that may occur in carpal tunnel.

MeSH Terms

Carpal Tunnel Syndrome*
Chondroma*
Diagnosis, Differential
Radiography
Ultrasonography

Figure

• 

  Fig. 1 A 64-year-old woman with carpal tunnel syndrome caused by an extraskeletal chondroma. A-C. AP (A) and oblique (B) radiographs of the wrist demonstrate a small, well-defined, oval, densely calcified mass (arrow) in the volar wrist. On carpal tunnel radiograph (C), the mass is located within the carpal tunnel (arrow). D-F. Transverse (D) and longitudinal (E) ultrasound (US) of the ventral wrist demonstrate a well-defined, echogenic lesion with posterior acoustic shadowing, consisting with a calcified lesion (cursors), in the deep portion of the carpal tunnel. Transverse (D) and paramedian longitudinal (F) US demonstrate that the median nerve flattens at the carpal tunnel (arrowhead in D, F) and appears to be hypoechoic swollen at the proximal portion (arrows in F). G, H. At low power photomicrograph (G), the tumor is encapsulated by a thick fibrous capsule and shows the nodular configuration (arrows). The hypocellular zone with myxoid background in the center (asterisks) and the hypercellular zone in the periphery (arrowheads) are seen (H&E stain, × 40). At high power photomicrograph (H), the peripheral zone of the tumor consists of mature benign looking chondrocytes with diffuse calcium depositions in the intercellular stroma (asterisks) (H&E stain, × 400).

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