A Large Extraskeletal Chondroma: An Unusual Location in the Lower Extremity, Huge Extraskeletal Chondroma: An Unusual Localization in the Leg.

ABSTRACT

INTRODUCTION: Extraskeletal chondroma (EC) is a rare benign neoplasm predominantly composed of mature hyaline cartilage; it develops in the soft tissues without any connection to bone cortex, intra-articular synovium, or periosteum. To date, only few cases have been reported in the leg, mainly in the knee, thigh, and popliteal region. CASE REPORT We describe herein the case of a 42-year-old woman with a 4-year history of a slow-growing, painful swelling on the posteromedial region of her left leg. Magnetic resonance imaging showed the presence of a huge mass occupying soleus muscle, compressing, and displacing anteriorly gastrocnemius muscle. After an incisional diagnostic biopsy, a complete surgical excision of the tumor was performed. On the basis of clinicoradiological and morphological findings, a diagnosis of EC was made. CONCLUSION: This report represents a clinicoradiological and morphological analysis about a very rare huge EC arising in the posteromedial region of the leg.