Table 1.

Risk factors of the CSDH recurrence.

Clinical factors

• age

• alcoholism

• history of head injury

• interval from onset of initial symptoms to hospitalization

Laboratory findings

• thrombocytepenia

• deficiency of coagulation factors

• liver dysfunction

CT, MRI findings

• brain atrophy

• intracranial hypotension

• hematoma (multilocular, multilayers)

Operative findings

• additional procedure (drainage tube)

• postoperative residual air