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2016-04-30 20:14:42
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answer #3
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answered by Anonymous
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Undoubtedly, women with smears showing severe dyskaryosis should have immediate colposcopy; many doctors believe that those with moderate dyskaryosis should be treated in the same way. But what to do about mild dyskaryosis is much less clear cut, and, indeed, the diagnosis is very subjective. According to the NHS cervical screening programme's guidelines, no justification exists for immediate colposcopy for mild dyskaryosis, but the programme wanted further research to determine whether cytological surveillance was as safe and effective as colposcopy.1 Such research is being conducted prospectively by the Aberdeen birthright project and is reported in this week's journal (p 1399).2
The arguments in favour of immediate colposcopy are that it allows early assessment and diagnosis - useful, given the well documented association between mild cytological abnormalities and high grade cervical intraepithelial neoplasia.3,4 In this week's journal, Soutter and Fletcher report that women with mild dyskaryosis are at high risk of developing invasive cervical cancer (p 1421).5 Colposcopy should result in reassurance and should protect against the risk of the patient defaulting from cytological follow up. Disadvantages claimed for immediate colposcopy include the cost, which results in suboptimal use of the procedure. There is also a risk of overtreatment, which has increased with the widespread adoption of a "see and treat" policy after the introduction of large loop excision of the transformation zone.
The Aberdeen group addressed the issue of cost and the use of resources. It reported that only one in four smears obtained from women with mild dyskaryosis undergoing cytological surveillance reverted to normal with time and that most women with mild dyskaryosis eventually required colposcopy. In view of this and the need to take additional smears the group believed that a policy of cytological surveillance was likely to be more expensive and less efficient. This hypothesis is also supported by Johnson and colleagues, who used decision analysis to compare the expected mortality and cost associated with immediate referral with those associated with cytological surveillance.6 The risk of ultimately developing invasive cancer was the same in both groups, but the cost was greater if a conservative policy (cytological surveillance) was adopted.
The other important findings in the paper from Aberdeen were that one third of women with cervical intraepithelial neoplasia grade III had an index smear showing mild dyskaryosis and that one in eight women defaulted from follow up. A previous paper has highlighted the risk of defaulting,7 and in this week's journal Macgregor and colleagues highlight the increased risk of invasive cervical cancer in women who are screened inadequately, or not at all (p 1407).8 Research to identify those women with mild dyskaryosis who may harbour high grade disease has focused mainly on the expression of human papillomavirus types,9 although a recent paper reported a strong association between such lesions and smoking.10 Should women with smears showing mild dyskaryosis therefore be selectively referred?
The remaining potential disadvantage of immediate referral is the risk of overtreatment. The advantages and disadvantages of a see and treat policy are illustrated in the short report by Downey et al in this week's journal in a population at high risk of defaulting (P 1412).11 Although large loop excision of the transformation zone is safe and effective,12 one should aim to avoid unnecessary treatment. Risk factors for overtreatment with large loop excision at the first attendance for colposcopy include minor cytological abnormalities,13 and caution should be exercised in patients with such abnormalities. But I believe that this risk is not an argument favouring cytological surveillance in patients with mild dyskaryosis - rather, an indication for a more complete colposcopic assessment before treatment, including punch biopsy of any lesion.
The time has come to review the recommendations for managing women in whom a smear shows mild dyskaryosis. A case can be advanced for selectively referring smokers with mild dyskaryosis for immediate colposcopy and for continuing with cytological surveillance for non-smokers. The data now available, however, justify a policy of immediate referral of all such patients for colposcopy. This would result in some increase in colposcopic surveillance but is surely preferable to cytological surveillance in a group with a high incidence of important disease who will ultimately need colposcopy, especially when there is a substantial risk of patients defaulting from follow up.
R Hammond
Duncan ID. NHS cervical screening programme: guidelines for clinical practice and programme management. Oxford: National Co-ordinating Network, 1992.
Flannelly G, Anderson D, Kitchener HC, Mann EMF, Campbell M, Fisher P, et al. Management of women mild and moderate cervical dyskaryosis. BMJ 1994;308:1399-403. [Abstract/Free Full Text]
Soutter WP, Wisdom S, Brough AK, Monaghan JM. Should patients with mild atypia in a cervical smear be referred for colposcopy? Br J Obstet Gynaecol 1986;93:70-4.
Giles JA, Deery A, Crow J, Walker P. The accuracy of repeat cytology in women with mildly dyskaryotic smears. Br J Obstet Gynaecol 1989;96:1067-70. [Medline]
Soutter WP, Fletcher A. Invasive cancer of the cervix in women with mild dyskaryosis followed up cytologically. BMJ 1994;308:1421-3. [Free Full Text]
Johnson N, Sutton J, Thornton JG, Lilford RJ, Johnson VA, Peel KR. Decision analysis for best management of mildly dyskaryotic smear. Lancet 1993;342:91 -6. [Medline]
Kirby AJ, Spieghalten DJ, Day NE, Fenton L, Swancon K. Conservative treatment of mild/moderate cervical dyskaryosis: long term outcome. Lancet 1992;339:828-31. [Medline]
Macgregor JE, Campbell MK, Mann EMF, Swanson KY. Screening for cervical intraepithelial neoplasia in north east Scotland shows fall inincidence and mortality from invasive cancer with concomitant rise in preinvasive disease. BMJ 1994;308:1407-11. [Abstract/Free Full Text]
Cuzick J, Terry G, Ho L, Hollingworth T, Anderson M. Human papillomavirus type 16 DNA in cervical smears as predictor of high-grade cervical cancer. Lancet 1992;339:959-60. [Medline]
Luesley D, Blomfield P, Dunn J, Shafti M, Chenoy R, Buxton J. Cigarette smoking and histological outcome in women with mildly dyskaryotic cervical smears. Br J Obstet Gynaecol 1994;101:49-52. [Medline]
Downey GP, Gabriel G, Deery ARS, Crow J, Walker PG. Management of female prisoners with abnormal cervical cytology. BMJ 1994;308:1412-3. [Free Full Text]
Bigrigg A, Haffenden DK, Sheehan AL, Codling BW, Read MD. Efficacy and safety of large-loop excision of the transformation zone. Lancet 1994;343:32 -4. [Medline]
Bigrigg MA, Codling BW, Pearson P, Read MD, Swingler GR. Colposcopic diagnosis and treatment of cervical dysplasia at a single clinic visit. Lancet 1990;336:229-31. [Medline]
2007-03-23 07:51:52
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answer #5
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answered by bebe10079 1
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