Abstract
1. Thirteen cases are reported of nerve compression by a ganglion. At operation a connection between the ganglion and the neighbouring joint was established in many instances.
2. It is suggested that so-called ganglia of the nerve sheath and simple ganglia are anatomical varieties of the same entity.
3. The treatment of choice is excision of the ganglion. If this procedure is technically difficult, puncture is advisable.
4. Recovery of sensibility after operation was good. Motor recovery was poor when damage to motor fibres occurred during excision of the ganglion or when paralysis had been present for more than eighteen months.
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