Chondroma is a growth composed of either hyaline or fibrous cartilage.

Arises from pre-existing cartilages, periosteum, or the medullary substance of the long bones. If it is found in localities where periosteum does not exist, as in the testicles and lungs, is called an enchondroma.

Is hard, encapsulated, and lobulated. Is slow in growth, may persist for years, and become very large.

Frequently undergoes mucoid degeneration and calcareous infiltration.

Fig. 49. - Lipoma from the Region of the Shoulder with Relatively Small Fat Cells. (M. Fl. Häm.) X 300 (Ziegler).

Is benign, but in combination with sarcoma may be quite malignant. Is also found in combination with lipoma, fibroma, and myxoma. An ecchondroma is a small overgrowth of cartilage. Are found on the edges of the articular, laryngeal, and nasal cartilages.