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pyelovenous and pyelolymphatic pyelosinus pyelotubular Benign prostatic hyperplasia(良性前列腺增生癥) ? Introduction a mon cause of bladder outlet obstruction symptoms appear after 50 years The prostate Etiology ?still obscur ?testosterone DHT ?growth factors Pathology ? Normal anatomical zones ? BPH derived from TZ ? degree of obstruction unparallel to its size ? hydronephrosis, detrusor hypertrophy, trabeculae, cellules,diverticulum, stones, hernia, infection, retention Pathology of BPH Pathology of BPH Clinical manifestations ? symptom not parallel to prostate size ? prostatism: frequency, urgency, nocturia ? dysuria ? retention Compli