Radiographic Diagnosis of “Laterally Spreading Tumor of the Colon and Rectum” Hiroyuki Kobayashi 1 , Tadahiko Fuchigami 1 1Institute of Gastroenterology, Matsuyama Red Cross Hospital Keyword: 側方発育型腫瘍 , LST , 大腸結節集簇様病変 , X線深達度診断 , 治療方針 pp.1744-1758
Published Date 2005/12/25
DOI https://doi.org/10.11477/mf.1403100178
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 Based upon the clinicopathological findings, we analyzed radiographic clues for the diagnosis of the depth of invasion of laterally spreading tumors (LST) of the colon and rectum.

 The majority of the LST granular type, which were classified on the basis of surface appearance into the following subtypes ; uniform nodular, mixed nodular and gross nodular type, had adenomatous components. However, the incidence of both carcinoma in the adenoma and invasive carcinoma was highest in the gross nodular type and higher in the mixed nodular type than in the uniform nodular type. The macroscopic findings of the surface depression was the most useful clue for diagnosis of the depth of invasion, but radiographic detection on the surface depression was hard compared with that by endoscopy. However, limited to the gross nodular type, radiographic deformities in the lateral view findings were useful for the diagnosis of the depth of invasion.

 On the other hand, according to the radiographic evaluation of LST non-granular type, radiographic diagnosis of the depth of invasion, indicated formerly for superficial type of colorectal tumors, was also useful for the LST non-granular type.

 As to the treatment of LST, we considered that it was important to take whatever measures the occasion demands such as endoscopic techniques, the use of medical instruments and other such things available in each hospital.

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