Difference between revisions of "Squamous intraepithelial lesion of the uterine cervix"

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===High-grade squamous intraepithelial lesion===
===High-grade squamous intraepithelial lesion===
Features - CIN II:<ref name=Ref_PBoD1075-6>{{Ref PBoD|1075-6}}</ref>
{{Main|High-grade squamous intraepithelial lesion}}
*Increased nuclear-cytoplasmic ratio, loss of polarity, incr. mitoses, hyperchromasia.
**If there are large nuclei... you should seen 'em on low power, i.e. 25x.
 
Notes:
#Hyperchromasia is a very useful feature for identifying CIN (particularly at low power, i.e. 25x).
#Koilocytes are the key feature of CIN I.
#Koilocytes are ''not'' considered to be part of a CIN II lesion or CIN III lesion.
#Large irregular nuclei are not required for CIN II... but you should think about it.
#Some mild changes at the squamo-columnar junction are expected.
#Look for the location of mitoses...
#* If there is a mitosis in the inner third (of the epithelial layer) = think CIN I. 
#* If there is a mitosis in the middle third (of the epithelial layer) = think CIN II.
#* If there is a mitosis in the outer third = think CIN III.
#Prominent [[nucleoli]] are ''not'' present in CIN.<ref name=Ref_GP146>{{Ref GP|146}}</ref>
#*Nucleoli are common in reactive changes.<ref>STC. January 2009.</ref>
#The most probably place for CIN is the posterior cervix (6 o'clock position) - risk is marginally increased.<ref name=pmid16378031>{{Cite journal  | last1 = Pretorius | first1 = RG. | last2 = Zhang | first2 = X. | last3 = Belinson | first3 = JL. | last4 = Zhang | first4 = WH. | last5 = Ren | first5 = SD. | last6 = Bao | first6 = YP. | last7 = Qiao | first7 = YL. | title = Distribution of cervical intraepithelial neoplasia 2, 3 and cancer on the uterine cervix. | journal = J Low Genit Tract Dis | volume = 10 | issue = 1 | pages = 45-50 | month = Jan | year = 2006 | doi =  | PMID = 16378031 }}
</ref>
*The difference between CIN II (moderate dysplasia) and CIN III (severe dysplasia) is: changes as in CIN II + outer third (or full thickness).<ref name=Ref_PBoD1075-6>{{Ref PBoD|1075-6}}</ref>
 
DDx:
*[[CIN II]].
*[[Squamous cell carcinoma of the uterine cervix]].
 
====Images====
Image:
<gallery>
Image:Cervical intraepithelial neoplasia (3) CIN2.jpg| CIN II. (WC/KGH)
Image:Cervical_intraepithelial_neoplasia_(4)_CIN3.jpg| CIN III. (WC/KGH)
</gallery>
<gallery>
Image: High-grade squamous intraepithelial lesion -- intermed mag.jpg | HSIL - intermed. mag.
Image: High-grade sqaumous intraepithelial lesion -- high mag.jpg | HSIL - high mag.
Image: High-grade squamous intraepithelial lesion - p16 -- high mag.jpg | HSIL - p16 - high mag.
</gallery>
www:
*[http://www.flickr.com/photos/euthman/6076642630/in/pool-labmed CIN III (flickr.com/euthman)].
*[http://www.flickr.com/photos/euthman/3995927827/in/pool-labmed CIN III (flickr.com/euthman)].
*[http://www.flickriver.com/photos/euthman/tags/hsil/ CIN III - several images (flickriver.com)].


==IHC==
==IHC==
Line 105: Line 67:


==Sign-out==
==Sign-out==
{{Main|Low-grade squamous intraepithelial lesion}}
{{Main|High-grade squamous intraepithelial lesion}}
===ECC - cannot grade===
===ECC - cannot grade===
<pre>
<pre>
Line 132: Line 96:
A cervical biopsy is suggested.
A cervical biopsy is suggested.
</pre>
</pre>
===LEEP===
<pre>
UTERINE CERVIX, LOOP ELECTROSURGICAL EXCISION PROCEDURE (LEEP):
- CERVICAL INTRAEPITHELIAL NEOPLASIA 2 (MODERATE DYSPLASIA).
- DEEP, ENDOCERVICAL AND EXOCERVICAL MARGINS NEGATIVE FOR INTRAEPITHELIAL NEOPLASIA.
</pre>
<pre>
UTERINE CERVIX, LOOP ELECTROSURGICAL EXCISION PROCEDURE (LEEP):
- CERVICAL INTRAEPITHELIAL NEOPLASIA 3 (SEVERE DYSPLASIA).
- DEEP, ENDOCERVICAL AND EXOCERVICAL MARGINS NEGATIVE FOR INTRAEPITHELIAL NEOPLASIA.
</pre>
<pre>
UTERINE CERVIX, LOOP ELECTROSURGICAL EXCISION PROCEDURE (LEEP):
- CERVICAL INTRAEPITHELIAL NEOPLASIA 3 (SEVERE DYSPLASIA).
- DEEP, ENDOCERVICAL AND EXOCERVICAL MARGINS NEGATIVE FOR INTRAEPITHELIAL NEOPLASIA.
- NEGATIVE FOR MALIGNANCY.
COMMENT:
CIN 3 is seen in 2 of 5 blocks and has a total linear extent of 17 millimeters.
</pre>
<pre>
UTERINE CERVIX, LOOP ELECTROSURGICAL EXCISION PROCEDURE (LEEP):
- HIGH-GRADE SQUAMOUS INTRAEPITHELIAL LESION (HSIL).
- DEEP, ENDOCERVICAL AND EXOCERVICAL MARGINS NEGATIVE FOR DYSPLASIA.
- NEGATIVE FOR MALIGNANCY.
COMMENT:
HSIL is seen in 3 of 4 blocks and has a total linear extent of approximately
12 millimeters.
The HSIL is in keeping with cervical intraepithelial neoplasia 3 (severe dysplasia).
</pre>
===Cervical biopsy===
====At least CIN 2====
<pre>
UTERINE CERVIX, BIOPSY:
- AT LEAST CERVICAL INTRAEPITHELIAL NEOPLASIA 2 (MODERATE DYSPLASIA).
- TRANSFORMATION ZONE PRESENT.
</pre>
<pre>
UTERINE ENDOCERVIX, CURETTAGE:
- HIGH-GRADE SQUAMOUS INTRAEPITHELIAL LESION (HSIL).
- ENDOCERVICAL MUCOSA AND STRIPPED ENDOCERVICAL EPITHELIUM WITHIN NORMAL LIMITS.
COMMENT:
The HSIL is in keeping with CIN 2.
</pre>
<pre>
UTERINE CERVIX, BIOPSY:
- HIGH-GRADE SQUAMOUS INTRAEPITHELIAL LESION (HSIL).
- TRANSFORMATION ZONE PRESENT.
COMMENT:
A p16 immunostain is strong and within the limits of the tissue orientation appears to mark
the full thickness of squamous epithelium in the suspicious area. A Ki-67 immunostain marks
increased numbers of superficial epithelial cells.
The HSIL is in keeping with at least CIN 2.
</pre>
====CIN 2 surrounded by endocervical epithelium====
<pre>
UTERINE CERVIX, BIOPSY:
- HIGH-GRADE SQUAMOUS INTRAEPITHELIAL LESION (HSIL).
- ENDOCERVICAL EPITHELIUM WITHIN NORMAL LIMITS.
COMMENT:
A p16 stain marks the full thickness of the squamous epithelium and is strong.
A Ki-67 stain marks increased numbers of superficial epithelial cells.
The epithelium surrounding the lesion is endocervical. No normal exocervical epithelium is
apparent in the sampled tissue.
The HSIL is in keeping with CIN 2.
</pre>
====CIN 3====
<pre>
UTERINE CERVIX, BIOPSY:
- CERVICAL INTRAEPITHELIAL NEOPLASIA 3 (SEVERE DYSPLASIA).
</pre>
<pre>
COMMENT:
A p16 stain marks the full thickness of the squamous epithelium and is strong. 
A Ki-67 stain marks increased numbers of superficial epithelial cells.
</pre>
===Micro===
====CIN 2====
The sections show the transformation zone.
The squamous epithelium has a moderately increased nuclear-to-cytoplasmic ratio, and
nuclear hyperchromasia extending to the mid level of the epithelium. Binucleation
is present. A mid level mitoses is seen in one section.
A p16 immunostain, within the limits of the tissue orientation, focally marks (in the
suspicious area) weakly the full thickness of the squamous epithelium and strongly
marks up to the lower half of the epithelium. A Ki-67 immunostain marks increased numbers of
superficial epithelial cells.
====CIN 3====
The sections show the transformation zone.
The squamous epithelium has an increased nuclear-cytoplasmic ratio, loss of polarity, mitoses and nuclear hyperchromasia extending to the superficial third of the epithelium.  Mitoses are seen in the upper third of the epithelium.  No nucleoli are present. No invasion is identified.
The columnar epithelium has focal involvement by the squamous lesion.  There is no columnar dysplasia.  The margins are negative for dysplasia.
=====Biopsy=====
The sections show the transformation zone.
The squamous epithelium has an increased nuclear-cytoplasmic ratio, loss of polarity,
mitoses and nuclear hyperchromasia extending to the superficial third of the epithelium.
Mitoses are seen in the upper third of the epithelium. Nucleoli are not apparent.
No invasion is identified.
No columnar dysplasia is identified.
=====Alternate=====
The sections show fragments of transformation zone.
There is dysplastic squamous epithelium with coarse chromatin, nuclear hyperchromasia,
nuclear enlargement, irregular nuclear membranes, and an increase nuclear-to-cytoplasmic
ratio.  Mitotic activity is abundant focally (5 mitoses/0.2376 mm*mm).  The dysplastic
squamous epithelium does not show appreciable maturation toward the surface (CIN 3).
The dysplastic squamous epithelium is not associated with stroma; thus, the
presence/absence of invasion cannot be assessed.  Small nucleoli are seen rarely.
There is benign squamous epithelium. Scant benign stripped endocervical epithelium is
present.


==See also==
==See also==

Latest revision as of 06:52, 23 September 2014

Squamous intraepithelial lesion of the uterine cervix is a precancerous lesion of the uterine cervix.

It is generally referred to as squamous intraepithelial lesion, abbreviated SIL, though this is somewhat ambiguous as the terminology is being applied to other anatomical sites, e.g. vagina.

In the past, it was known as cervical intraepithelial neoplasia, abbreviated CIN. Prior to that, it was known as cervical dysplasia.

This topic is dealt with from a cytology perspective in the gynecologic cytopathology article.

General

Divided into grades:

  • Low-grade.
  • High-grade.

The new and old terminology

SIL (current terminology) LSIL HSIL
Recent terminology CIN I CIN II, CIN III
Very old terminology mild dysplasia moderate dysplasia, severe dysplasia

Treatment

Overview:

  • LSIL: follow-up, as it usually regress.
  • HSIL: excision (e.g. cone, LEEP, laser) + follow-up.

Procedures

Loop electrosurgical excision procedure (LEEP):

  • Used for squamous lesions -- pathologist typically gets several pieces.

Cone:

  • Used for endocervical lesions, i.e. adenocarcinoma in situ (AIS).
  • Pathologist gets a ring or donut-shaped piece of tissue.

Gross

  • Acetowhite lesion at colposcopy.

Microscopic

Low-grade squamous intraepithelial lesion

Main article: Low-grade squamous intraepithelial lesion

High-grade squamous intraepithelial lesion

Main article: High-grade squamous intraepithelial lesion

IHC

Features:[1]

  • p16.
    • Diffuse strong staining involving at least all of the basal aspect of the epithelium = CIN II or CIN III.
    • Patchy, weak positive staining = CIN I or squamous metaplasia.
  • Ki-67.
    • Several positive cells above basal layer suggests CIN II or CIN III.

Notes:

  • Both p16 and Ki-67 are usually negative in CIN I -- 75% of cases.[2]
    • CIN I with p16 staining appears to have a higher risk of progression the p16 negative CIN I.[3]

Sign-out

Main article: Low-grade squamous intraepithelial lesion
Main article: High-grade squamous intraepithelial lesion

ECC - cannot grade

UTERINE CERVIX, BIOPSY:
- FRAGMENTS OF SQUAMOUS EPITHELIUM SHOWING DYSPLASIA, SEE COMMENT.

COMMENT:
The fragments of squamous epithelium do not show full epithelial 
thickness. Thus, while dysplasia is apparent, it is not possible 
to distinguish low-grade from high-grade in this specimen. That said,
there is at least low grade-dysplasia. Follow-up is recommended with 
re-biopsy if clinically indicated.

UTERINE ENDOCERVIX, CURETTAGE:
- FRAGMENTS OF SQUAMOUS EPITHELIUM SHOWING DYSPLASIA, CANNOT GRADE, SEE COMMENT.
- BENIGN STRIPPED ENDOCERVICAL EPITHELIUM AND BENIGN SCANT ENDOCERVICAL MUCOSA.

COMMENT:
The fragments of squamous epithelium do not show the full epithelial thickness; this limits
the interpretation.

A p16 immunostain strongly marks very scant squamous epithelium, and a Ki-67 immunostain
marks increased numbers of squamous cells. 

A cervical biopsy is suggested.

See also

References

  1. ↑ Singh, M.; Mockler, D.; Akalin, A.; Burke, S.; Shroyer, A.; Shroyer, KR. (Feb 2012). "Immunocytochemical colocalization of P16(INK4a) and Ki-67 predicts CIN2/3 and AIS/adenocarcinoma.". Cancer Cytopathol 120 (1): 26-34. doi:10.1002/cncy.20188. PMID 22162342.
  2. ↑ Jackson, JA.; Kapur, U.; Erşahin, Ç. (Apr 2012). "Utility of p16, Ki-67, and HPV test in diagnosis of cervical intraepithelial neoplasia and atrophy in women older than 50 years with 3- to 7-year follow-up.". Int J Surg Pathol 20 (2): 146-53. doi:10.1177/1066896911427703. PMID 22104735.
  3. ↑ del Pino, M.; Garcia, S.; Fusté, V.; Alonso, I.; Fusté, P.; Torné, A.; Ordi, J. (Nov 2009). "Value of p16(INK4a) as a marker of progression/regression in cervical intraepithelial neoplasia grade 1.". Am J Obstet Gynecol 201 (5): 488.e1-7. doi:10.1016/j.ajog.2009.05.046. PMID 19683687.
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