%0 Journal Article %T A Case of Cisternal Pilocytic Astrocytoma Diagnosed with the Balanced Steady-State Free Precession Sequence for Magnetic Resonance Imaging: A Rare Cause of Subarachnoid Hemorrhage %A Hiroshi Kashimura %A Kenta Aso %A Mitsumasa Osakabe %A Sotaro Oshida %A Taro Suzuki %A Yosuke Akamatsu %J Archive of "World Neurosurgery: X". %D 2019 %R 10.1016/j.wnsx.2018.100003 %X In approximately 15% of cases of spontaneous subarachnoid hemorrhage (SAH), an obvious source of bleeding cannot be identified by angiography; these are considered cases of SAH of unknown etiology. A rare case of cisternal pilocytic astrocytoma (PA) presenting with SAH is reported. The usefulness of the balanced steady-state free precession (bSSFP) sequence for magnetic resonance imaging (MRI) to detect small cisternal lesions is discussed %K Balanced steady-state free precession sequence %K Cistern %K Pilocytic astrocytoma %K Subarachnoid hemorrhage %K Unknown etiology bSSFP %K Balanced steady-state free precession %K CT %K Computed tomography %K MRI %K Magnetic resonance imaging %K PA %K Pilocytic astrocytoma %K SAH %K Subarachnoid hemorrhage %U https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6580896/