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Objectives: To assess the risk of brain damage in premature infants under 34 weeks of gestational age exposed to histological chorioamnionitis (HCA). Materials and methods: A cohort study was conducted at the Hospital Cayetano Heredia, during 2015. Premature infants under 34 weeks of gestational age, who had histopathological examination of the placenta, were included. The types of HCA evaluated were sub-chorionitis, chorionitis, chorioamnionitis, with or without funisitis. Brain damage was evaluated in three age periods, between 0 and 7 days, between 7 and 30 days and at 40 weeks of corrected gestational age. A neurological follow-up and regular controls were performed with brain ultrasound. Results: A total of 85 premature infants were included, 47.1% were women and the mean gestational age was 30.9 weeks. From the total, 42% (36/85) were born exposed to HCA. Premature rupture of membranes was the main cause of sepsis, which was related to neurological damage. HCA was associated with intraventricular hemorrhage (IVH) during the first week and with white matter lesions between 7 and 30 days of age (p = 0.035). The chorioamnionitis type of HCA was associated with neurological damage during the first week (RR = 2.11, 95% CI: 1.09-4.11) and between 7 and 30 days of age (RR = 2.72, 95% CI: 1.07-6.88). Conclusions: Chorioamnionitis was a risk factor for developing brain injuries in premature infants under 34 weeks of gestational age. It was also a risk factor for HIV during the first 7 days and for white matter injuries between 7 and 30 days of age. At 40 weeks of corrected gestational age, extreme premature infants with HCA had more extensive brain damage. Objetivos: Evaluar el riesgo de daño cerebral en prematuros menores de 34 semanas expuestos a corioamnionitis histológica (CAH). Materiales y métodos: Se realizó un estudio de cohortes en el Hospital Cayetano Heredia, durante el 2015. Fueron incluidos prematuros menores de 34 semanas que tuvieran examen histopatológico de la placenta. Los tipos de CAH evaluados fueron subcorionitis, corionitis, corioamnionitis, con o sin funisitis. El daño cerebral se evaluó en tres periodos de edad, entre 0 y 7 días, entre 7 y 30 días y a las 40 semanas gestacionales corregidas. Se realizó un seguimiento neurológico y controles con ecografía cerebral. Resultados: Se estudiaron 85 prematuros, 47,1% eran mujeres y la media de la edad gestacional fue de 30,9 semanas. El 42% (36/85) nacieron expuestos a CAH. La ruptura prematura de membrana fue la principal generatriz de sepsis, y la sepsis se relacionó con daño neurológico. La CAH estuvo asociada con hemorragia intraventricular (HIV) durante la primera semana y con lesiones de la sustancia blanca entre los 7 y 30 días de edad (p = 0,035). El tipo corioamnionitis de CAH se asoció al daño neurológico durante la primera semana (RR = 2,11; IC 95%: 1,09-4,11) y entre los 7 y 30 días de vida (RR = 2,72; IC 95%: 1,07-6,88). Conclusiones: La corioamnionitis fue un factor de riesgo para desarrollar lesiones cerebrales en prematuros menores de 34 semanas, para HIV durante los primeros 7 días y lesiones de sustancia blanca entre los 7 y los 30 días de edad. A las 40 semanas de edad corregida, los prematuros extremos con CAH tuvieron lesiones cerebrales más extensas.