What is "enchondroma"

Enchondroma \En`chon*dro"ma\, n. [NL., fr. Gr. ? in + ? cartilage + -oma.] (Med.) A cartilaginous tumor growing from the interior of a bone.
--Quain.

1. n. benign slow-growing tumor of cartilaginous cells at the ends of tubular bones (especially in the hands and feet)

2. [also: enchondromata (pl)]

An enchondroma is a cartilage cyst found in the bone marrow. Typically, enchondroma is discovered on an X-ray scan. Enchondromas have a characteristic appearance on Magnetic Resonance Imaging (MRI) as well. They have also been reported to cause increased uptake on PET examination.