（103-106题共用题干）患者65岁，男性，近8年来夜尿由2-3次渐增至4-5次,排尿涅滞不畅，昨晚发生小便欲解不能，小腹急满胀痛，舌黯、脉细涩，直肠指诊前列腺増大约5cm x4_lcm x3bm，中央沟消失，质韧有弹性，光滑无结节。首先考虑的疾病是

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