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容易误诊的，心中有个概念。
Benign Epithelial Inclusions in Axillary Lymph Nodes:Report of 18 Cases and Review of the Literature (Am J Surg Pathol 2011;35:1123–1133)Abstract: The occurrence of various types of heterotopic
epithelial structures in lymph nodes is a well-documented
phenomenon. Here, we report on the presence of such inclusions
in axillary lymph nodes. A total of 18 cases were identified. All
patients were women, their ages ranging from 32 to 79 years
(median, 57 y). Thirteen patients had concomitant or antecedent
breast abnormalities, and 12 of them had undergone nodal
sampling for staging purposes. The other 5 patients had noted
enlarging axillary masses, with no clinical evidence of previous
or concomitant breast or genital tract pathology. We classified
the nodal inclusions on morphologic grounds into 3 main
categories: those composed exclusively of glandular structures
(glandular-type inclusions; 10 cases, 56%); those made up only
of squamous cysts (squamous-type inclusions; 2 cases, 11%);
and those containing both glandular and squamous epithelia
(mixed glandular-squamous-type inclusions; 6 cases, 33%). We
speculate about the possible mechanism for the migration of the
epithelial cells into the lymph nodes, discuss the modifications
that they may later undergo as a result of local and systemic
factors, and consider the differential diagnosis with other