Visual snow syndrome and its relationship with migraine.

Introduction: Visual snow syndrome (VSS) is a central nervous system disorder that consists of the constant perception of small black and white dots throughout the entire visual field.

Development: VSS can present from infancy to old age, with greater prevalence in the young population, and shows no difference between sexes. The diagnostic criteria include the presence of visual snow and such other visual phenomena as palinopsia, photophobia, nyctalopia, and other persistent visual phenomena.

Visual snow syndrome and its relationship with migraine.

Introduction: Visual snow syndrome (VSS) is a central nervous system disorder that consists of the constant perception of small black and white dots throughout the entire visual field.

Development: VSS can present from infancy to old age, with greater prevalence in the young population, and shows no difference between sexes. The diagnostic criteria include the presence of visual snow and such other visual phenomena as palinopsia, photophobia, nyctalopia, and other persistent visual phenomena.

Suspicion of intraoperative left main coronary artery extrinsic compression with Perceval® sutureless bioprosthesis.

We present an uncommon case of intraoperative transient myocardial ischemia related to suspicion of left main stem artery extrinsic compression caused by the radial force of the stent of Perceval® bioprosthesis. No other cases have been described, but some similarities can be found with extrinsic coronary compression in percutaneous pulmonary valves. Surgeons should be aware of this complication in patients with coronary anomalies or with bicuspid anatomy.