Extra-lobar intra-abdominal pulmonary sequestration.

An ultrasonography scan detected a left upper quadrant abdominal mass in a fetus of 20 weeks gestation. The mass was confirmed by a postnatal ultrasonography scan, computerized tomography and magnetic resonance imaging prior to surgery. The sonographic characteristic of this lesion was that of a homogenous echogenic mass embedded in the left diaphragmatic crus, which moved with respiration. Histopathological evaluation of the mass demonstrated alveolar and bronchial tissue, with its own visceral pleural covering corroborating the diagnosis of extra-lobar intra-abdominal pulmonary sequestration. Surgical excision is a valid recommendation because of the uncertainty of preoperative diagnosis of this uncommon malformation.