Posterior hepatodiaphragmatic interposition of the colon complicated by appendicitis.

Posterior hepatodiaphragmatic interposition is a rare malposition of the cecum that persists over time but is usually of little or no clinical importance. However, when inflammation occurs in the appendix, the symptoms and signs are those of subphrenic disease rather than abdominal disease and may be misleading to the attending physicians. Radiologists should report the presence of anterior and posterior hepatodiaphragmatic interposition and should differentiate between the two.