A rare osseous growth on sacrum

An unusual osseous growth on the ventral aspect of a male sacrum was observed during routine osteology demonstrations for undergraduate medical students. The osseous growth was predominantly arising from left half of the first sacral vertebral body and the promontory. Such a large growth on its ventral aspect can cause compression of rectum leading to pressure symptoms like constipation and of the sympathetic chain causing bladder and bowel dysfunction. If in female, its presence can also reduce the anteroposterior diameter of pelvic inlet thereby leading to obstructed labor.