An ecchondroma is a type of

chondroma A chondroma is a benign cartilaginous tumor, which is encapsulated with a lobular growing pattern. Tumor cells (chondrocytes, cartilaginous cells) resemble normal cells and produce the cartilaginous matrix (amorphous, basophilic material). Prese ...

that is

subperiosteal The periosteum is a membrane that covers the outer surface of all bones, except at the articular surfaces (i.e. the parts within a joint space) of long bones. Endosteum lines the inner surface of the medullary cavity of all long bones. Structur ...

. A proliferation is known as "ecchondrosis".

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Benign neoplasms Osseous and chondromatous neoplasia {{neoplasm-stub