Occipital sinus with normal calibre transverse sinuses
History of one episode of fits, normal milestones
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Occipital sinuses are present on both sides draining into internal jugular veins. The transverse and sigmoid sinuses are of normal caliber bilaterally.
Occipital sinuses are the smallest of all cerebral dural venous sinuses and recognised in approximately 10% of normal population. When seen usually they are associated with absence or hypoplasia of transverse and sigmoid sinuses.
During the gestational period, occipital sinus originates as small venous channels originating from the primitive torcula and medial portions of transverse sinuses and course towards the marginal sinus around the foramen magnum. The occipital sinuses are most prominent during the fifth gestational month. Subsequently there is reduction in number and caliber of these occipital sinuses so that by birth these sinuses are only seen in minority of the population. These sinuses are not always in midline and show variable course.
When detected during any radiological study they have to be mentioned to assist in better planning for craniotomy surgeries involving the posterior fossa.