Radiopaque shadow in the lumbar region on plain X-ray abdomen: diagnostic dilemma.

A 28-year-old man presented with right flank pain. Radiological investigations suggested the diagnosis of a calcified mass in the retroperitoneum below the right kidney. Laparoscopic exploration using the retroperitoneoscopic approach was performed. However, it was not possible to locate the lesion and an open exploration was done. During exploration a large fecolith was found trapped in a diverticulum of the cecum.