MRI is increasingly being used in the diagnosis of fetal anomalies suspected on USG. The USG evaluation of fetal spinal anomalies is limited by acoustic shadowing, fetal position and the amount of liquor. Fetal MRI is able to show spinal anomalies well, as in our case of fetal diastematomyelia with a dorsal dermal sinus, suspected on USG at 28 weeks gestation.

Normally, there is no obvious communication between the intracranial and extra cranial venous drainages in the head. In Sinus Pericranii, there is an abnormal communication, either from the extra cranial system to the intracranial venous sinuses or from the intracranial venous system to the extra cranial draining veins. Venous anomaly is a collection of non muscular venous blood vessels, adhering tightly to the outer surface of the skull and directly communicating with an intracranial venous sinus through diploic veins. The varicosities are intimately associated with the periostium, are distensible, and vary in size with changes in intracranial pressure Sinus pericranii is not a single clinico pathologic entity, rather a symptom complex with diverse clinical manifestations.In this article,the authors present a case of 8 mo old boy having Sinus Pericranii.

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IntroductionHeadache is a common presenting complaint and has a wide differential diagnosis. Clinicians need to be alert to clues that may suggest an underlying secondary aetiology. We describe a novel case of headache secondary to intracranial hypotension which was precipitated by the rupture of a spinal arachnoid cyst.Case reportA 51-year-old Indian female presented with sudden onset severe headache suggestive of a subarachnoid haemorrage. Investigations including a computed tomography brain scan, cerebrospinal fluid examination and a magnetic resonance angiogram were normal. The headache persisted and magnetic resonance imaging revealed bilateral thin subdural collections, a spinal subarachnoid cyst and a right-sided pleural effusion. This was consistent with a diagnosis of headache secondary to intracranial hypotension resulting from spinal arachnoid cyst rupture.ConclusionsSpinal arachnoid cyst rupture is a rare cause of spontaneous intracranial hypotension. Spontaneous intracranial hypotension is a common yet under-diagnosed heterogeneous condition. It should feature significantly in the differential diagnosis of patients with new-onset daily persistent headache.

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