结肠腺瘤性息肉伴黏膜下淋巴腺复合体
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  淋巴腺复合体(lymphoglandular complex,LGC)是指紧邻黏膜肌层或黏膜下层的淋巴结内含有肠黏膜。少见情况下,结直肠腺瘤会包含有黏膜下LGC,似浸润性腺癌伴有黏膜下淋巴聚集,成为诊断陷阱。本研究旨在明确黏膜下LGC和真性浸润特定的组织学特征。我们选用7例腺瘤(6例为管状/管状绒毛状腺瘤,其中4例伴有高级别上皮内瘤变,1例伴有灶性黏膜内腺癌,以及1例无蒂锯齿状腺瘤),其中右侧5例,左侧2例。7例腺癌,其中右侧3例,左侧2例,直肠/直肠乙状结肠2例。腺瘤的黏膜下LGC通常位于固有层,其LGC与表面腺瘤具有连续性,腺体呈圆形且包含在淋巴组织内,缺乏“假浸润”的主要特征;其中1例表现为伴有黏膜肌层疝样突出。腺癌至少具有以下特征之一:出现单个细胞/小团簇细胞浸润(n=5),腺体发育不良、融合和不规则(n=2),实性肿瘤细胞巢形成(n=1),促结缔组织增生性反应(n=5)、管腔内坏死(n=3)或淋巴血管浸润(n=1)。相比之下,腺瘤不具有这些特征。腺癌无疝样突出,但其浸润部分与黏膜面的腺癌有一定的延续性(n=5)。5例浸润性腺癌浸润到黏膜下层,超出淋巴浸润范围。综上所述,腺瘤伴LGC 比较罕见、临床病理学上是一种特殊的假浸润,与浸润性腺癌相似,其组织学特征是淋巴组织内腺体轮廓呈完整的钝圆形,无单细胞/小团簇细胞浸润,无腺体不良、融合和不规则腺体,无实性肿瘤细胞巢,无促结缔组织增生性反应和淋巴血管浸润。
Am J Surg Pathol 2018;42:1083-1089
美国外科病理学杂志中文版2019年第一期摘要NO.8
昝丽坤 翻译 郗彦凤 审校
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