Table 1

The radiological signs present on initial cranial magnetic resonance imaging, showing signs of spontaneous intracranial hypotension

Case	Age (years)	Iter displacement*	Tonsil displacement	Dural enhancement	Sinus	Collection depth	Site of subdural collection
Case 4 did not have radiological demonstration of spontaneous intracranial hypotension before development of subdural haematoma.
*Displacement of iter as defined by Reich.[15]
1	66	−3 mm	−3 mm	Enhancement	Sag sinus dilated	Left 4 mm; right 4 mm	Supra- and infratentorial
2	49	−8 mm	+2 mm	No contrast	Sag sinus dilated	Left 8 mm; right 5 mm	Supra- and infratentorial
3	39	−10 mm	0 mm	No contrast	Sag sinus dilated	Left 8 mm; right 8 mm	Supra- and infratentorial