Interhemispheric subdural haematoma is considered to be rare finding even in the era of computer tomography. The aim of the paper is to present a group of 14 patients (5 males, 9 females), average age 57.9 years, operated on for interhemispheric subdural haematoma, in all but one patient of traumatic origin. Symptoms related to the compression of medial cortex of cerebral hemisphere described as typical were not fully exacerbated in all patients. Falx syndrome as the sole manifestation was described in two patients, in other patients the clinical symptoms were determined by associated injuries. CT was the investigation of choice in all patients. Surgical evacuation of haematoma by means of parasagital osteoplastic craniotomy or burr hole trephination was used in all patients. Clinical outcome was determined by clinical condition on admission and the presence of haemorrhagic contusions. Another adversive prognostic factors were anticoagulation treatment or the presence of coagulopathy. It is mandatory to stress the possibility of sudden clinical worsening of initially conservatively treated patients.

        Key words: posttraumatic intracranial bleeding – interhemispheric subdural haematoma – falx syndrome