Síncope como forma de presentación de masa mediastínica

pediatric syncope accounts for 3% of the consultations in emergency department. it is frequent in pediatrics, particularly in teenager girls between 15 and 19 years old, and up to a 25% of them have suffered from a syncopal episode. most causes are benign, but the aim in its initial evaluation is ruling out those which mean any danger. heart disease can lead to syncope in a 10-28% of cases. a detailed medical history and an exhaustive exploration are enough to rule out organic pathology in most situations. we present the case of a diffuse large b cell lymphoma located in the mediastinum diagnosed after repetitive syncopal episodes.