[Low obturation ileus caused by gallstone incarceration in sigmoid colon].

Authors presents two cases of low obturation ileus caused by gallstone which had obstructed sigmoid colon. They pay attention to diagnostic problems and usefulness of sonography and X-ray techniques also in case of biliary ileus. Authors shows difficulties in surgical procedures, prefering enterotomy and evacuation of concrement, without simultaneous internal biliary fistula liquidation, especially in cases of increased risk and in old age patients.