摘要:THYMUS HYPERTROPHY IS AN ANATOMICAL-PHYSIOLOGICAL ENTITY THAT IS SPECIFIC TO THE NEWBORN AGE. TWINNING PREDISPOSES TO "RISKS", PREMATURE BIRTH, LOW WEIGHT, INCREASED (SECONDARY) SUSCEPTIBILITY TO INFECTIONS. WE HAVE CONDUCTED A STUDY OF TWO PAIRS OF UNIVITELINE TWINS THAT SHOW A POSSIBLE LINK BETWEEN THYMIC HYPERTROPHY AND THE SEVERE POTENTIAL EVOLUTION OF A NEWBORN PNEUMONIA, THE EXPLANATION BEING GIVEN BY ANATOMICAL FEATURES, MECHANICAL, INFECTIOUS FACTORS, AND POOR IMMUNE CAPITAL.