A study of dissected lymph nodes of the rectal cancer on the size of node and the metastatic area of positive node.

概要

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In rectal cancers a macroscopic diagnosis of the lymphatic spread is difficult because metastatic lymph nodes are small and the metastatic areas are also small in the nodes. To realize the situations, we measured the diameters of nodes and evaluated the metastatic areas of positive ones in parmanent specimens of the dissected nodes of 63 cases. (707 nararectal nodes. 1242 lateral and 433 naraaortal) Followings are the results; 1: Positive nodes are larger than negative ones in the mean diameter. 2: Positive nodes smaller than 5 mm in diameter comprise 57.0 % (53/93) of the positive pararectal nodes and 29.8% (14/47) of the lateral positive ones. 3: Positive nodes of which metastatic areas are smaller than 1/3 of the whole area comprize 17.2 % (16/93) of the pararectal positive nodes and 8.5% (4/47) of the lateral nodes. 4: Metastatic cases in which all the metastatic nodes are smaller than 5 mm in diameter or the metastatic areas are smaller than 1/3 of the whole area amount to 36.8% (7/19) of the pararectal positive cases and 37.5% (3/8) of the lateral positive cases.
日本大腸肛門病学会の論文