Bone Cysts

**Definition:** Benign unilocular lytic areas in the proximal end of a long bone with well defined and narrow endosteal margins. The cysts contain fluid and the cyst walls may contain some giant cells. Bone cysts usually occur in males between the ages 3-15 years.

**Tree numbers:** - C04.182.089 - C05.116.070

**Synonyms:** - Solitary Cysts