A limited lepidic sample
A fictional patient has a lung lesion sampled with a small core. The core shows an epithelial proliferation growing along alveolar structures, and the tissue examined does not demonstrate stromal invasion. A trainee reports that the entire lesion is definitely an adenocarcinoma in situ without reviewing the whole lesion size, imaging or a sufficiently representative specimen. The responsible pathologist notes that the core can describe what was seen but cannot exclude invasive growth elsewhere. The case supplies no complete resection and no established whole-tumor invasion assessment. The learning task is to distinguish a sampled growth pattern from a complete diagnostic category with size and sampling requirements.
1. What conclusion is unsupported?
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The absence of invasion in this limited sample does not independently prove absence throughout the entire lesion or establish every criterion for an in situ category.
2. How should the limitation be communicated?
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Describe the actual morphology and specimen limitation, integrating appropriate imaging and further assessment rather than overstate certainty.