Ganglion cysts originating from the sternoclavicular joint in children have not been previously reported. In this study, 5 children who presented with a small mass over the anterior aspect of the sternoclavicular joint were evaluated and treated. Only 1 patient was symptomatic. A ganglion cyst was suspected in each case and confirmed by magnetic resonance imaging in 3 patients and ultrasound in one patient. Excisional biopsy was performed in 3 patients and the diagnosis of a ganglion cyst confirmed histopathologically. No patient has had a recurrence. Observation of asymptomatic cystic lesions that arise in the sternoclavicular location is recommended.