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Its development from fibrous tissue is more likely to result in a fibroma; from fat tissue, a lipoma, or a myxoma; from cartilage or bone, a chondroma or osteoma.

There is no cartilage in the kidney or parotid gland, yet a chondroma, or cartilage tumor, may develop in either.

Chondroma.—A chondroma is mainly composed of cartilage.

Virchow has divided chondromata into two forms—those which he calls ecchondromata, which grow from cartilage, and those that grow independently from cartilage, or the enchondromata, which latter are in the great majority.

All intermediate forms between the innocent chondroma and the malignant chondro-sarcoma are met with.