Simple Bone Cyst

A simple bone cyst (unicameral bone cyst) is a benign bone lesion characterized by the formation of a fluid-filled cavity within the bone. It is especially common in childhood and adolescence. It most frequently develops in the upper arm bone (humerus) and thigh bone (femur).

Simple bone cysts usually do not cause any symptoms and are detected incidentally during radiological examinations performed for other reasons. However, the growth of the cyst can lead to thinning of the bone tissue and a decrease in its strength. In some patients, pathological fractures may occur as a result of minor trauma.

Diagnosis and Evaluation

In the evaluation of simple bone cysts, the patient's age, complaints, physical examination findings, and radiological examinations are considered together.

X-ray is the primary imaging method used to assess the location, size, and effect of the cyst on the bone structure.

Magnetic resonance imaging (MRI) or computed tomography (CT) scans may be used when necessary. Biopsy is generally not required in simple bone cysts that show typical imaging characteristics.

Treatment Approaches

Treatment for simple bone cysts is planned according to the size and location of the cyst, the patient's age, and the risk of fracture.

For small, asymptomatic cysts that do not threaten bone integrity, regular clinical and radiological follow-up may be sufficient.

In cysts with a high risk of fracture, those showing growth, or those causing symptoms, interventional or surgical treatment options may be considered.

In suitable patients, treatment can be applied with injections into the cyst, curettage, bone grafting, or bone filler materials. In cases where bone strength is significantly reduced, fixation methods may also be necessary.

Since simple bone cysts can recur after treatment, regular follow-up is important, especially in patients in their growth period.