Abstract
1. Thirteen instances of compression of the lower trunk of the brachial plexus at the thoracic inlet are described.
2. In each case the cause of compression was an aponeurotic band passing from the seventh cervical transverse process to the first rib.
3. The symptoms, physical signs, radiological features and findings at operation are described.
4. Satisfactory results followed removal of the band.
5. The anatomical arrangements are compared with those of the "normal" thoracic outlet and with those obtaining in cases of "vascular" thoracic outlet syndrome.
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