Perichondroma

A tumor arising from the perichondrium, the dense membrane composed of fibrous connective tissue that closely wraps (invests) all cartilage (except the articular surfaces of the cartilage in joints which are covered by synovial membranes). Perichondromas are benign.

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peri·chon·dro·ma (per″e-kon-droґmə) [perichondrium + -oma] a tumor arising from the perichondrium.