Sonographic appearances of inverted Meckel diverticulum with intussusception.

This study illustrates the sonographic findings of inverted Meckel diverticulum acting as a lead point of an intussusception in five patients. In four patients, the inverted diverticulum was seen as a segment of blind-ending, thick-walled bowel projecting for a variable distance from the apex of the intussusceptum. The larger diverticula had a characteristic bulbous shape. The central serosal surface of the inverted diverticulum was filled with fluid in one patient, with fluid and fat in another, and with echogenic fat only in the other two. The presence of fat was confirmed by CT in one patient. The features illustrated in these four patients appear to be specific. In the fifth patient, the sonogram revealed a nonspecific echogenic mass at the apex of the intussusceptum. Recognition of these features on sonography may obviate the need for further investigation.