[Intraosseous ganglia of the carpal bones]

Symptom-producing cystic lesions in the carpal bones may be caused by intraosseous ganglia. Two different types occur: a completely intraosseous type and a rarer penetrating type. Two cases of the latter type are presented. In both of the types, the symptoms consist of pain following prolonged stress. In the penetrating type, a soft tissue tumour can be palpated. A cystic region of decalcification is visible radiographically. As a rule, no degenerative joint changes are encountered. Treatment consists of emptying of the cyst and bone transplantation in rare cases. Recurrence is rare.