An intraabdominal extrathoracic pulmonary sequestration (IEPS) was detected by prenatal ultrasound in a fetus of 19 weeks' gestation. The well-defined echogenic mass, including multiple cystic areas, was located in the left suprarenal region. Knowledge of the characteristic ultrasound appearance helped to differentiate between neuroblastoma and IEPS before surgical treatment. Histologic examination showed an association between IEPS and features of cystic adenomatoid malformation type 2.
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