Harlequin syndrome is a rare disorder of the sympathetic nervous system characterized by unilateral facial flushing and sweating. Although its etiology is unknown, this syndrome appears to be a dysfunction of the autonomic nervous system. To the best of our knowledge, thus far, very few reports on perioperative Harlequin syndrome after thoracic surgery have been published in the thoracic surgic...

it is an autosomal recessive, and occasionally autosomal dominant mutant extremely rare disorder with only 100 reported case in literature. this fatal disorder occur in both sexes and all races. in most circumstances the newborn die soon after birth also it is known as harlequin fetus, alligator baby or keratosis diffusa fatalis. because of its rarity, we report 2 cases of this disorder, here.