病历摘要：女性64岁近一年余记忆力下降四肢肌力、肌张力如常颅神经（－）。<img src="/Image1/bb/bbc72d1dad3e452ccb4cf696fe622d56.jpg" /><img src="/Image1/46/46300918f15cea3cdd1df716fd956201.jpg" /><img src="/Image1/63/63e2c9cdea0854bacceb6785b0af660c.jpg" /><img src="/Image1/5f/5f9329427ca5ffe64f9b237c12221bbe.jpg" /><img src="/Image1/8f/8f975c232975ad4a0d206c9e84b49851.jpg" /><img src="/Image1/44/4444765e49495912ca2c8f64efe53bac.jpg" /> 2.诊断依据是什么？