Epidemiologic surveys of congenital anomalies such as EA, which is a rare disease, provide valuable data for public health authorities and fulfill one important mission of reference centers. When compared with previous epidemiological data, this national population-based registry suggests that the incidence of EA remains stable.

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Prenatal ultrasonographic (US) detection of congenital adenomatoid malformation (CAM) was made in 18 fetuses at 17 - 36 weeks' gestation and managed in our institution during a 10-year period (1985-1994). The lesion was left-sided in 13 cases, right-sided in 4, and bilateral in 1. According to Stocker's classification, 12 cases were type I, 4 type II, and 2 type III. The prenatal course was followed with serial US examinations in 13 cases; the size of the lesion was stable in 8 and decreased in 5. Mediastinal shift was usually observed, and amniotic fluid volume was increased in 4 cases. One fetus was aborted. Six infants presented with respiratory distress syndrome and required neonatal surgery; delayed surgery was performed in 9 cases. Spontaneous regression of the lesion was observed on follow-up in 2 cases. Surgery consisted in lobectomy in 8 cases and segmentectomy in 6. The presence of fetal hydrops, type III lesions, and bilateral lung involvement are prenatal factors known to be associated with a poor prognosis. However, this series and a review of the literature suggest that caution should be observed with regard to the initial impression when counseling the parents regarding prognosis.

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