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Abstract
Cranial magnetic resonance imaging (MRI) detected a 6 cm × 7 cm × 9 cm cerebral falx-based tumor with an irregular shape, iso-signal intensity on T1-weighted image (T1-WI), high-signal intensity on T2-WI, and inhomogeneous enhancement without obvious peritumoral edema. The tumor was surgically accessed under general anesthesia through the frontal-parietal midline approach and found to be located in the middle of the frontal and parietal lobes, looking reddish with a clear boundary and rich blood supply, consisting of both soft and ductile components. Immunohistochemical (IHC) staining showed positive for cluster of differentiation 34, B-cell lymphoma 2, vimentin and smooth muscle actin, myoepithelium, negative for epithelial membrane antigen, and S-100; the Ki-67 index was less than 1%. Department of Neurosurgery, Peking Union Medical College Hospital, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing 100730 Jun-Ji Wei: Department of Neurosurgery, Peking Union Medical College Hospital, Peking Union Medical College, Chinese...