Objective: To determine the incidence of neonatal microcephaly in the Hospital Cayetano Heredia, throughout a well-defined period. Material and Methods: Microcephaly was determined by a cephalic perimeter lower than the third percentile for age and sex. Reported records of the Hospital’s Perinatal Computer System between January 1st, 2016 and December 31st, 2017, were used. Fenton growth chart’s parameters were used to determine the limits of normality. Results: A total of 416 cases of neonatal microcephaly were registered, a general rate of 53.4 per 1,000 live births, up to 185 per 1000 live births in preterm infants (<37 weeks), with higher figures among males. Conclusions: A high incidence rate of microcephaly was found, probably higher in preterm infants and due to multiple causes. Observational biases cannot be discarded.

El Síndrome de Miller Fisher (SMF) es una variante del Síndrome de Guillain Barré (SGB), caracterizado por la tríada clínica de oftalmoplejía, ataxia y areflexia. Se presenta el caso de un niño de 12  años de edad, examinado con un tiempo de enfermedad de 4 días y con una variedad de síntomas que incluían ptosis palpebral, somnolencia, marcha tambaleante y debilidad muscular, asociados a  antecedente de infección respiratoria de vías altas. El examen clínico demostró paresia del III, IV, y VI nervios craneales de ambos ojos, arreflexia y debilidad distal en extremidades. Se instaló tratamiento con Inmunoglobulina intravenosa que condujo a una evolución clínica satisfactoria.