摘要原发性小肠淋巴瘤（primary small intestinal lymphoma,PSIL）是指起源于肠壁黏膜下淋巴组织的恶性肿瘤,与全身性淋巴瘤侵及肠道所继发的病变不同,又称结外淋巴瘤[1]。Dawson提出5项诊断标准：①未发现体表浅淋巴结肿大;②白细胞计数及分类正常;③胸部CT无纵隔淋巴结肿大;④手术时未发现受累小肠及肠系膜区域淋巴结以外病灶;⑤肝、脾无损害[2]。
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