Systematic Review of Meningiomas Revealed by Spontaneous Intracranial Hemorrhage: Clinicopathological Features, Outcomes, and Rebleeding Rate.

Meningiomas are rarely revealed by an intracranial hemorrhage (ICH). Rebleeding occurrence rate and time of onset are unknown. Here, we performed a systematic review of the literature of meningiomas revealed by ICH. We retrospectively collected all meningiomas revealed by spontaneous ICH published between January 1980 and December 2021. We reported clinicopathological features of meningiomas revealed by ICH. We also estimated rebleeding rate and time to onset. Ninety-two studies met all inclusion criteria, led to a total of 120 cases. The mean age was 56.3 years, with 66 (55%) female. Seventy-nine (66%) cases were conscious before surgery, 20 (17%) were in coma, and 17 (14%) were unconscious after deterioration. The most frequent bleeding type was subdural hemorrhage (N = 49, 41%) followed by intraparenchymal hemorrhage (IPH) (N = 44, 37%), subarachnoid hemorrhage (SAH) (N = 22, 18%), and intraventricular hemorrhage (IVH) (N = 5, 4%). IPH and hindbrain/ventricular locations are associated with poor outcomes (P = 0.031 and < 0.001, respectively). Among the 19 patients who did not undergo surgical resection of the meningioma, 14 (74%) experienced rebleeding with a median occurrence of 120 days (interquartile, [90; -]). Rebleeding occurs earlier if the type of bleeding is SAH or IVH and for hindbrain location (both P < 0.01). ICH is a rare presentation of meningiomas. Hindbrain and ventricular tumor location and IPH are associated with poor outcomes. Rebleeding rate is high and premature. It occurs earlier if the first bleeding was SAH or IVH and for hindbrain location. [ABSTRACT FROM AUTHOR]