Intra-abdominal extralobar pulmonary sequestration

A left-upper-quadrant abdominal mass was identified in a routine ultrasound (US) examination in the 16th week of gestation. The sonographic features were those of a homogeneous, hyperechogenic lesion situated between the diaphragm and the left kidney. Other radiologic examinations (CT, MRI) confirmed the mass, but a presumptive diagnosis could not be made. The lesion was excised and histologic examination demonstrated an extralobar pulmonary sequestration. Although it is an uncommon type of congenital malformation, pulmonary sequestration should be included in the differential diagnosis when an echogenic intraabdominal mass is detected on antenatal US.