Colposcopy

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Colposcopy
Intervention
Illu cervix.jpg
In this diagram, the canal of the cervix (or endocervix) is circled at the base of the womb. The vaginal portion of the cervix projects free into the vagina. The transformation zone, at the opening of the cervix into the vagina, is the area where most abnormal cell changes occur
ICD-9-CM67
MeSHD003127
OPS-301 code:1-671
 
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Not to be confused with colonoscopy.
Colposcopy
Intervention
Illu cervix.jpg
In this diagram, the canal of the cervix (or endocervix) is circled at the base of the womb. The vaginal portion of the cervix projects free into the vagina. The transformation zone, at the opening of the cervix into the vagina, is the area where most abnormal cell changes occur
ICD-9-CM67
MeSHD003127
OPS-301 code:1-671

Colposcopy (Ancient Greek: κόλπος kolpos “hollow, womb, vagina” + skopos "look at") is a medical diagnostic procedure to examine an illuminated, magnified view of the cervix and the tissues of the vagina and vulva.[1] Many premalignant lesions and malignant lesions in these areas have discernible characteristics which can be detected through the examination. It is done using a colposcope, which provides an enlarged view of the areas, allowing the colposcopist to visually distinguish normal from abnormal appearing tissue and take directed biopsies for further pathological examination. The main goal of colposcopy is to prevent cervical cancer by detecting precancerous lesions early and treating them. The procedure was developed by the German physician Hans Hinselmann, with help from Eduard Wirths.[2][3]

A specialized colposcope equipped with a camera is used in examining and collecting evidence for victims of rape and sexual assault.

Indications[edit]

Most women undergo a colposcopic examination to further investigate a cytological abnormality on their Pap smears. Other indications for a patient to have a colposcopy include:

Many physicians base their current evaluation and treatment decisions on the report "Guide to the Management of Cytological Abnormalities and Cervical Cancer Precursors", created by the American Society for Colposcopy and Cervical Pathology, during a September 2001 conference.[5]

Colposcopy should not be performed for persons treated for cervical cancer if their pap tests show low-grade squamous intraepithelial lesion or less.[6] Unless the person has a visible lesion, colposcopy for this population does not detect a recurrence of cancer.[6]

Procedure[edit]

Colposcope

During the initial evaluation, a medical history is obtained, including gravidity (number of prior pregnancies), parity (number of prior deliveries), last menstrual period, contraception use, prior abnormal pap smear results, allergies, significant past medical history, other medications, prior cervical procedures, and smoking history. In some cases, a pregnancy test may be performed before the procedure. The procedure is fully described to the patient, questions are asked and answered, and the patient then signs a consent form.

A colposcope is used to identify visible clues suggestive of abnormal tissue. It functions as a lighted binocular microscope to magnify the view of the cervix, vagina, and vulvar surface. Low power (2× to 6×) may be used to obtain a general impression of the surface architecture. Medium (8× to 15×) and high (15× to 25×) powers are utilized to evaluate the vagina and cervix. The higher powers are often necessary to identify certain vascular patterns that may indicate the presence of more advanced pre-cancerous or cancerous lesions. Various light filters are available to highlight different aspects of the surface of the cervix. Acetic acid solution and iodine solution (Lugol's or Schiller's) are applied to the surface to improve visualization of abnormal areas.

Colposcopy is performed with the woman lying back, legs in stirrups, and buttocks at the lower edge of the table (a position known as the dorsal lithotomy position). A speculum is placed in the vagina after the vulva is examined for any suspicious lesions.

Three percent acetic acid is applied to the cervix using cotton swabs. Areas of acetowhiteness correlate with higher nuclear density. The squamocolumar junction, or "transformation zone", is a critical area on the cervix where many precancerous and cancerous lesions most often arise. The ability to see the transformation zone and the entire extent of any lesion visualized determines whether an adequate colposcopic examination is attainable.

Areas of the cervix which turn white after the application of acetic acid or have an abnormal vascular pattern are often considered for biopsy. If no lesions are visible, an iodine solution may be applied to the cervix to help highlight areas of abnormality.

After a complete examination, the colposcopist determines the areas with the highest degree of visible abnormality and may obtain biopsies from these areas using a long biopsy instrument, such as a punch forceps, SpiraBrush CX or SoftBiopsy. Most doctors and patients consider anesthesia unnecessary; however, some colposcopists now recommend and use a topical anesthetic such as lidocaine or a cervical block to decrease patient discomfort, particularly if many biopsy samples are taken.

Following any biopsies, an endocervical curettage (ECC) is often done. The ECC utilizes a long straight curette, a Soft-ECC curette employing fabric to simultaneously collect tissue or a cytobrush (like a small pipe-cleaner) to scrape the inside of the cervical canal. The ECC should never be done on a patient who is pregnant. Monsel's solution is applied with large cotton swabs to the surface of the cervix to control bleeding. This solution looks like mustard and turns black when exposed to blood. After the procedure this material will be expelled naturally: patients can expect to have a thin coffee-ground like discharge for up to several days after the procedure. Alternatively, some physicians achieve hemostasis with silver nitrate.

Interpretation[edit]

One model for scoring colposcopy findings is the Swede Score, which assigns a score between 0 and 2 for 5 different parameters, as given in table below:

Swede Score for interpreting colposcopy findings[7]
Score
012
Uptake of
acetic acid
0 or transparentShady, milkyDistinct, stearin-like
Margins and surface0 or diffuseSharp, but irregular, jagged, "geographical" satellitesSharp and even, difference in surface level such as "cutting"
VesselsFine, regularAbsentCoarse or atypical
Lesion size< 5mm5-15 or spanning 2 quadrants>15mm or spanning 3-4 quadrants or endocervically undefined
Iodine stainingBrownFaintly or patchy yellowDistinct yellow

The total Swede Score ranges between 0 and 10. A score of ≥5 is reported to identify all high grade lesions (HGL), and ≥8 to have a specificity of 90% for HGL.[7] A score <5 is suggested to not require biopsy because of low risk of cancer, a score 5-7 to require biopsy, and a score ≥8 again not to require biopsy because it is likely more efficient to intervene by e.g. excision directly.[7]

Complications[edit]

Significant complications from a colposcopy are not common, but may include bleeding, infection at the biopsy site or endometrium, and failure to identify the lesion. Monsel's solution and silver nitrate interfere with interpretation of biopsy specimen, so these substances should not be applied until all biopsies have been taken. Some women experience a degree of discomfort during the curettage, and many experience discomfort during the biopsy.

Colposcopy with biopsy does not cause infertility or subfertility.[8]

Follow up[edit]

Adequate follow-up is critical to the success of this procedure. Human Papillomavirus (HPV) is a common infection and the underlying cause for most cervical dysplasia. Patients should be counseled on the benefits of safe sex for reducing their risks of contracting and spreading HPV.[9] One study suggests that prostaglandin in semen may fuel the growth of cervical and uterine tumours and that those who are affected may benefit from the use of condoms.[10][11]

Smoking predisposes one to developing cervical abnormalities. A smoking cessation program should be part of the treatment plan for patients who smoke.

Treatments for significant lesions include cryotherapy, loop electrical excision procedure (LEEP), and laser ablation.

References[edit]

  1. ^ Chase DM, Kalouyan M, DiSaia PJ (May 2009). "Colposcopy to evaluate abnormal cervical cytology in 2008". Am. J. Obstet. Gynecol. 200 (5): 472–80. doi:10.1016/j.ajog.2008.12.025. PMID 19375565. 
  2. ^ "The Deadly Origins Of A Life-saving Procedure – Forward.com". Retrieved 2010-01-22. 
  3. ^ http://books.google.com/books?id=rB0yxE2WhWIC&pg=PA3&lpg=PA3&dq=colposcopy+Wirths+hinselmann&source=bl&ots=7cYPAlzM37&sig=HobpEVFkFIJqevsxRpGDTXwdpiU&hl=es-419&ei=AElJTdf1CoH98AaNwsirDg&sa=X&oi=book_result&ct=result&resnum=5&ved=0CEYQ6AEwBA#v=onepage&q=colposcopy%20Wirths%20hinselmann&f=false
  4. ^ [1]
  5. ^ JAMA 2001 Consensus Guidelines for the Management of Women With Cervical Cytological Abnormalities
  6. ^ a b Society of Gynecologic Oncology (February 2014), "Five Things Physicians and Patients Should Question", Choosing Wisely: an initiative of the ABIM Foundation (Society of Gynecologic Oncology), retrieved 19 February 2013 , which cites
    • Rimel, B. J.; Ferda, A.; Erwin, J.; Dewdney, S. B.; Seamon, L.; Gao, F.; Desimone, C.; Cotney, K. K.; Huh, W.; Massad, L. S. (2011). "Cervicovaginal Cytology in the Detection of Recurrence After Cervical Cancer Treatment". Obstetrics & Gynecology 118 (3): 548. doi:10.1097/AOG.0b013e3182271fdd. 
    • Tergas, A. I.; Havrilesky, L. J.; Fader, A. N.; Guntupalli, S. R.; Huh, W. K.; Massad, L. S.; Rimel, B. J. (2013). "Cost analysis of colposcopy for abnormal cytology in post-treatment surveillance for cervical cancer". Gynecologic Oncology 130 (3): 421. doi:10.1016/j.ygyno.2013.05.037. 
  7. ^ a b c Page 91 in: Principles and Practice of Colposcopy. JP Medical Ltd. 2011. ISBN 9789350250945. 
  8. ^ Spracklen, C. N.; Harland, K. K.; Stegmann, B. J.; Saftlas, A. F. (2013). "Cervical surgery for cervical intraepithelial neoplasia and prolonged time to conception of a live birth: A case-control study". BJOG: an International Journal of Obstetrics & Gynaecology 120 (8): 960–965. doi:10.1111/1471-0528.12209. PMC 3691952. PMID 23489374.  edit
  9. ^ New England Journal of Medicine Condom Use and the Risk of Genital Human Papillomavirus Infection in Young Women
  10. ^ "Semen 'may fuel cervical cancer'". BBC. 2006-08-31. Retrieved 2007-12-02. 
  11. ^ "Semen can worsen cervical cancer". Medical Research Council (UK). Retrieved 2007-12-02. 

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