Recently, the stromal invasion grading system was proposed for small adenocarcinomas of ≤2.0 cm. The system is based on the presence or absence of a fibrotic focus, and the extent of invasion into the ...
According to the predominant histologic pattern, the 2015 WHO classification system categorized invasive pulmonary adenocarcinoma (IPA) into three groups: low grade (lepidic predominant), intermediate ...
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