Dural sinus thrombosis in spontaneous intracranial hypotension: Hypotheses on possible mechanisms.
Dural sinus thrombosis (DST) is rarely associated with spontaneous intracranial hypotension (SIH). Engorgement of the venous system, caused by the CSF loss that occurs in SIH, is considered to favour the thrombosis, although signs of both SIH and DST are usually seen simultaneously at the first diagnostic MRI. We observed two patients with SIH and DST. Changes in pattern of headaches and MRI findings demonstrated that DST followed SIH. In SIH, the velocity of the blood flow in the dural sinuses may be reduced because of dilatation of the venous system which compensates the CSF loss. Other possible mechanisms seem unlikely on the grounds of both clinical presentation and MRI studies.
Savoiardo
Mario
M
Department of Neuroradiology, Istituto Nazionale Neurologico C. Besta, Via Celoria 11, 20133, Milano, Italy.
Armenise
Silvia
S
Spagnolo
Pantaleo
P
De Simone
Tiziana
T
Mandelli
Maria Luisa
ML
Marcone
Alessandra
A
Morciano
Giancarlo
G
Andreula
Cosma
C
Mea
Eliana
E
Leone
Massimo
M
Chiapparini
Luisa
L