The venous drainage disorder with the risk of cerebral and sinus thrombosis is actually more frequent cause of clinical symptoms than it is generally assumed. Even slowed- down venous return of blood from the brain has become a high-risk factor especially in thrombophilia or in hypercoagulation conditions. The authors describe the case of paroxysmal headache in a 22-years old man with posttraumatic hygroma in occipital region, which caused intermittent disorder in venous drainage. It was only the magnetic resonance angiography and its venous phase, which confirmed disorder of venous drainage as a cause of paroxysmal headache. The magnetic resonance angiography with the examination of the venous phase is considered as a suitable sensitive and non-invasive examination for the detection of cerebral venous drainage disorder.

        Key words: thrombosis – cerebral venous and sinus thrombosis – cerebral venous drainage – thrombophilia – magnetic resonance angiography