患者男；５１岁。右侧头痛２个月伴左侧肢体麻木１个月入院。查体：神志清楚，对答切题，头颅无畸形，双侧瞳孔等圆等大，对光反射正常，仰舌居中，颈软，四肢肌张力正常。双侧病理征（－）。左下肢感觉减退。 ＣＴ扫描所见：右颞、顶叶见一类似肾形的稍高密度环影， ＣＴ值 ３ Patient male; 51 years old. Right headache 2 months with left limb numbness 1 month admission. Examination: Consciousness, answering the question, the head without deformity, bilateral pupil circle and other large, normal light reflex, Yangxuan middle, neck soft, limb muscle tone normal. Bilateral pathological sign (-). Left lower extremity feeling diminished. CT scan seen: right temporal, parietal lobes see a slightly higher density of renal shadow, CT value 3