Bilateral bony bar bridging of the sigmoid sulcus : a case report

The crest, plate and bars like bony projections may be present on sigmoid sulcus. The bony connection between petrous temporal and occipital bone may divide the jugnlar foramen. A skull with bilateral curved bony plate connecting the inner margin of groove for sigmoid sinus and petrous temporal was observed during routine osteology classes. The shape, size and location of both the bars were almost identical. These bony bars were connecting the posterior margin of petrous temporal and postero-lateral part of sigmoid sulcus. Structurally, they resembled as a part of ring. The location of the bar was more lateral on left side as compared to right side. Some bony erosion was also seen in the floor of sigmrid sulcus. Bilateral ossification and formation of bar at sigmoid sulcus is associated with venous sinus anomalies, dural ossification and intracranial calcifications.