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Cerebrospinal fluid—venous fistula. Lumbar spine MRI, axial T2 sequence with fat suppression, shows (A) left perineural diverticulum (arrowhead) with (B and C) fistulization to paraspinal veins and paravertebral plexuses (arrows). Clinical Differential Diagnoses Primary headache, including tension headache and migraine. Postural orthostatic tachycardia

Cerebrospinal fluid—venous fistula. Lumbar spine MRI, axial T2 sequence with fat suppression, shows (A) left perineural diverticulum (arrowhead) with (B and C) fistulization to paraspinal veins and paravertebral plexuses (arrows). Clinical Differential Diagnoses Primary headache, including tension headache and migraine. Postural orthostatic tachycardia

Cerebrospinal fluid—venous fistula. Lumbar spine MRI, axial T2 sequence with fat suppression, shows (A) left perineural diverticulum (arrowhead) with (B and C) fistulization to paraspinal veins and paravertebral plexuses (arrows). Clinical Differential Diagnoses Primary headache, including tension headache and migraine. Postural orthostatic tachycardia

Cerebrospinal fluid; STIR, short tau inversion recovery. Panel A shows an axial C T scan of the head with narrowed lateral ventricles positioned near the midline. The cerebral cortex surrounds the ventricles, and the skull contour is intact. Panel B presents a sagittal

Cerebrospinal fluid; STIR, short tau inversion recovery. Panel A shows an axial C T scan of the head with narrowed lateral ventricles positioned near the midline. The cerebral cortex surrounds the ventricles, and the skull contour is intact. Panel B presents a sagittal

Cerebrospinal fluid; STIR, short tau inversion recovery. Panel A shows an axial C T scan of the head with narrowed lateral ventricles positioned near the midline. The cerebral cortex surrounds the ventricles, and the skull contour is intact. Panel B presents a sagittal