Case report. Pelvic rib/digit.

In summary, a case of a pelvic rib/digit is presented. Although there is no surgical proof that the finding does indeed represent a sacral rib, its radiographic findings are characteristic enough to warrant this diagnosis. In some respects, the lesion is similar to other cases that have appeared in the literature, but it differs in that it has features of both a pelvic rib and pelvic digit, suggesting a spectrum of development of these anomalous bony structures.