A rare case: Hypothenar Hammer syndrome

Hypothenar Hammer syndrome (HHS) was firstly described by Von Rosen. It is a rare occupational disease and is caused by major or repeated trauma and often affect ulnar artery on hypothenar region. This region is only covered by skin and subcutaneous tissue, and has a comparatively less protected anatomical structure. A 55-year-old male patient presented with complaints of cold and knob on his left hand. After conforming the diagnosis with arteriography, aneurysmal segment was resected and saphenous vein was interposed on the resected segment. The patient was followed for one year without any complication. In conclusion, with accurate diagnosis and appropriate treatment, symptoms can be eliminated and life quality can be improved.