Recurrence factors for chronic subdural hematomas after burr-hole craniostomy and closed system drainage.

Recurrence of chronic subdural hematoma after burr-hole craniostomy and closed system drainage is not uncommon. We sought to identify risk factors for recurrence. In 121 patients, various factors including age, initial neurologic status, hematoma thickness, computed tomographic density of the hematoma, midline shift, multiplicity, systemic disease, and drainage volume were compared retrospectively between nonrecurring cases and recurring cases. Recurrence was noted in 10 cases (8.3%). In recurring cases, the drainage volume was significantly larger than in nonrecurring cases, and the recurrence rate increased in proportion to drainage volume. Other factors significantly influencing recurrence were hematoma thickness and associated diabetes mellitus. Drainage contents mainly derived from either exudate within the subdural membrane or cerebrospinal fluid leakage. Entry of cerebrospinal fluid into the hematoma cavity or continuing leakage of serum components through opened endothelial gap junctions are considered to be major causes of increased drainage volume, leading in turn to recurrence of the hematoma.

Hypothalamic pilocytic astrocytoma presenting with intratumoral and subarachnoid hemorrhage.

A 45-year-old male presented with sudden onset of severe headache. Computed tomography and magnetic resonance imaging demonstrated an irregularly enhanced suprasellar mass with intratumoral and subarachnoid hemorrhage. The mass was removed in two operations. Histological examination of the tumor revealed pilocytic astrocytoma. The relatively rich vascularity and perivascular tumor cell proliferation observed in this benign lesion were probably the causes of this extremely rare association.