M85: Other disorders of bone density and structure

M85.4: Solitary bone cyst

Solitary bone cyst is a non-cancerous bone abnormality found mostly in children and adolescents, particularly in the long bones of the body such as those found in the arms and legs. While the exact cause is unknown, it is thought to be related to issues with the growth of the bone. This condition often shows no symptoms and may be discovered incidentally during a routine or unrelated X-ray exam. In some cases, symptoms may appear if the bone weakens and fractures, resulting in sudden pain or limping. The solitary bone cyst is typically hollow and filled with fluid, causing the bone to become less robust and more susceptible to fractures. The cyst itself does not spread or cause damage to other parts of the body. Despite its benign nature, it may impair normal bone growth and development if not properly managed.