A 62 year-old woman with no previous medical history presented to the Dermatology department with sweating disorders for several years. She described segmental hyperhidrosis and hyperemia while running. This excessive sweating occurred in the left hemiface, the left half of the trunk, the left upper limb and the right lower limb (Fig. 1A). This was associated with heat intolerance and previous faintness during sport. She did not describe any chest pain before faintness and the cardiac auscultation was normal.
