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| ==Poorly differentiated carcinoma== | | ==Poorly differentiated carcinoma== |
| ===General===
| | {{Main|Poorly differentiated carcinoma of the lung}} |
| *Should be used when the DDx is ''small cell carcinoma'' versus ''non-small cell carcinoma''.
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| *''Poorly differentiated carcinoma'' leaves the surgical options on the table.
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| ===IHC===
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| *Lack of staining with [[neuroendocrine markers]] (chromogranin A -ve, synaptophysin -ve, CD56 -ve).
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| *Keratins +ve.
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| ===Sign out===
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| <pre>
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| Lung, Left Lower Lobe, Core Biopsy:
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| - POORLY DIFFERENTIATED CARCINOMA, see comment.
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| COMMENT:
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| The tumour stains as follows:
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| POSITIVE: EMA, AE1/AE3.
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| NEGATIVE: TTF-1, chromogranin A, synaptophysin, CD56, CD45.
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| The morphology would be compatible with small cell carcinoma or basaloid
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| squamous cell carcinoma.
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| The neuroendocrine markers (chromogranin A, synaptophysin, CD56) and the squamoid
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| markers available (p63, CK5/6) are negative; thus, the tumour is not further classified.
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| </pre>
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| ==Lung metastasis== | | ==Lung metastasis== |