Computed tomography demonstration of inferior lumbar (Petit's) hernia.

Inferior lumbar (Petit's) hernia is an uncommon condition resulting from a defect in the posterior abdominal wall. Such hernias may be difficult to diagnose on the basis of physical signs and symptoms. A case of unsuspected inferior lumbar hernia clearly demonstrated by computed tomography (CT) is presented. Computed tomography is useful in determining the size and contents of the hernia, permitting accurate diagnosis, and planning treatment.