Hemorrhagic pericardial effusion causing pericardial tamponade in hereditary hemorrhagic telangiectasia.

Osler-Weber-Rendu disease, or Hereditary Hemorrhagic Telangiectasia (HHT), is a rare, inherited autosomal dominant disorder characterized by telangiectasia and arteriovenous malformations in various organs. We report a unique case of HHT-associated hemorrhagic pericardial effusion presenting with pericardial tamponade.