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Difference between revisions of "Surgical margins"
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→Types of margins: fix sp
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**Sample a subset of the surface. | **Sample a subset of the surface. | ||
**The distance between the margin and lesion can be measured at microscopy, i.e. on the glass slide. | **The distance between the margin and lesion can be measured at microscopy, i.e. on the glass slide. | ||
Note: | |||
*It should ''always'' be clear from the ''[[Principles of grossing|gross description]]'' which type of margin was taken; this is especially important for cases that were not [[submitted in total]]. | |||
==Adequate margin== | ==Adequate margin== | ||
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represent stray ink, as the quantity of ink is minimal; however, margin | represent stray ink, as the quantity of ink is minimal; however, margin | ||
positivity cannot be completely excluded. | positivity cannot be completely excluded. | ||
</pre> | |||
===A re-excised (previously) positive margin is negative for tumour=== | |||
It occasionally happens that a re-excised margin specimen is negative for tumour. | |||
<pre> | |||
The lack of tumour in Part B may be explained by either of the following: | |||
(1) There was minimal clearance (<1 mm) in Part A that was not sampled. | |||
(2) The sampling of Part B missed minimal tumour involvement. | |||
</pre> | |||
Note: | |||
*One should review the positive margin call to ensure it isn't an overall. | |||
===Tumour in tip - flipped block=== | |||
<pre> | |||
Lesion, Right Lower Eyelid, Excision: | |||
- BASAL CELL CARCINOMA (BCC), favour positive margin, see comment. | |||
Comment: | |||
BCC was found in block 1 (one of the tips) on the initial cut. | |||
In block 1, BCC is present but distant from the inked margin in the plane | |||
of section. The margin is not completely in the plane of section; thus, | |||
trimming of a negative margin cannot be entirely excluded. As BCC is seen | |||
on both sides of the block, a positive margin is favoured. | |||
</pre> | </pre> | ||