It is also called extraskeletal chondroma or chondroma of soft-tissue parts.
Mentone et al., "Extraskeletal chondroma of the masseter muscle: a case report with review of the literature," International Journal of Oral and Maxillofacial Surgery, vol.
Extraskeletal chondromas occur in three variants: articular, paraarticular, and soft-tissue chondromas .
Marcial-Rojas, "Extraskeletal chondromas," Boletin de la Asociacion Medica de Puerto Rico, vol.
Zichichi, "Extraskeletal chondroma
of the foot," Journal of the American Podiatric Medical Association, vol.
Chan et al reported "an extraskeletal chondroma
with lipoblast like cells" in 1986.
Our patient presented an extraskeletal chondroma over the posterior aspect of the Achilles tendon that developed into the subcutaneous tissue of the Achilles bursa producing posterior heel pain.
One hundred and four cases of extraskeletal chondroma, 25 of which occurred in the lower limb, were reported by Chung and Enzinger.
After excision, benign extraskeletal chondroma can recur in 15% to 20% of the cases.
Extraskeletal chondromas occur as multiple nodules of synovial chondromatosis within a joint, as a solitary lesion within or adjacent to joint, or as an isolated cartilagenous lesion in the soft tissues, mostly of the hands and feet.
Caution must be exercised in the interpretation of lipoblast- or chondroblast-like cells in chondromyxoid matrix because similar findings may be seen in myxoid liposarcoma, extraskeletal myxoid chondrosarcoma, extraskeletal chondroma
, and hibernoma.
with chondroblastic and granuloma like elements.