Pulmonary sequestration: ultrasonic appearance.

Pulmonary sequestration is a congenital anomaly in which aberrant, nonfunctioning lung tissue receives its entire blood supply from the systemic circulation. Early diagnosis may be difficult because the radiographic and clinical presentation may be mimicked by other lesions, such as cystic adenomatoid malformation, congenital bronchogenic cyst, pleural effusion, congenital diaphragmatic hernia, or large diaphragmatic eventration. The following case is presented to describe and illustrate the sonographic appearance of pulmonary sequestration. To our knowledge, a case in which sonography provided the correct preoperative diagnosis has not been reported.