患者男,68岁。1个月前无明显诱因出现肢体乏力,无食欲不振、盗汗,无恶心、呕吐,无肢体抽搐及大小便失禁。体检:神志清楚,GCS评分15分(自行睁眼,定向准确,遵嘱活动),双瞳正圆等大,对光反射敏感,鼻唇沟无变浅或加深,伸舌居中,四肢肌力及肌张力正常,生理反射存在,病理征未引出。CT检查:左额叶见不规则环形混杂密度影,最大截面约37 mm×25 mm,环壁呈稍高密度,周围见 Male patient, 68 years old. 1 month ago no obvious incentive to appear limb weakness, no loss of appetite, night sweats, no nausea, vomiting, no limb twitching and incontinence. Physical examination: Consciousness, GCS score of 15 points (self-eyes open, accurate orientation, compliance activities), double pupil is round and so large, sensitive to light reflex, nasolabial fold no or deepen, tongue middle, limb muscle strength And normal muscle tone, the existence of physiological reflexes, pathological levy did not lead. CT examination: the left frontal lobe see irregular ring mixed density, the maximum cross-section of about 37 mm × 25 mm, the ring wall was slightly higher density, the surrounding see