Combined median and medial antebrachial cutaneous neuropathies: an upper-arm neurovascular syndrome.

The neurovascular bundle anatomy in the upper arm displays changing relationships of nerve and vascular structures along short segments. Fibrous tissues segregate these elements into enclosed compartments allowing for specific patterns of injury. We report a patient with a iatrogenic brachial artery injury in this region who featured combined median and MAC neuropathies, which were consistent with complete axonotmesis on neurophysiological assessment. Increased intracompartmental pressure may have led to nerve injury either thorough an ischemic mechanism or to focal compression. Recognition of this unusual pattern of nerve damage is important, since injury can be accurately localized to the midportion of the neurovascular compartment in the upper arm.