Vídeos de cirugía dermatológica
Screening for Anal Intraepithelial Neoplasia: High-Resolution Anoscopy-Guided Biopsy of the Anal Canal
Despistaje de la neoplasia intraepitelial anal. Biopsia de canal anal guiada por anoscopia de alta resolución
J.B. Repiso-Jiménez
, L. Padilla-Espana, T. Fernández-Morano, M. de Troya-Martín
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Área de Dermatología, Hospital Costa del Sol, Marbella, Málaga, España
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Repiso-Jiménez, L. Padilla-Espana, T. Fernández-Morano, M. de Troya-Martín" "autores" => array:4 [ 0 => array:4 [ "nombre" => "J.B." "apellidos" => "Repiso-Jiménez" "email" => array:1 [ 0 => "boscorepiso@gmail.com" ] "referencia" => array:1 [ 0 => array:2 [ "etiqueta" => "<span class="elsevierStyleSup">*</span>" "identificador" => "cor0005" ] ] ] 1 => array:2 [ "nombre" => "L." "apellidos" => "Padilla-Espana" ] 2 => array:2 [ "nombre" => "T." "apellidos" => "Fernández-Morano" ] 3 => array:2 [ "nombre" => "M." "apellidos" => "de Troya-Martín" ] ] "afiliaciones" => array:1 [ 0 => array:2 [ "entidad" => "Área de Dermatología, Hospital Costa del Sol, Marbella, Málaga, España" "identificador" => "aff0005" ] ] "correspondencia" => array:1 [ 0 => array:3 [ "identificador" => "cor0005" "etiqueta" => "⁎" "correspondencia" => "Corresponding author." ] ] ] ] "titulosAlternativos" => array:1 [ "es" => array:1 [ "titulo" => "Despistaje de la neoplasia intraepitelial anal. Biopsia de canal anal guiada por anoscopia de alta resolución" ] ] "textoCompleto" => "<span class="elsevierStyleSections"><p id="par0005" class="elsevierStylePara elsevierViewall">The estimated annual incidence of anal cancer in Spain is 0.2 cases per 100<span class="elsevierStyleHsp" style=""></span>000 population,<a class="elsevierStyleCrossRef" href="#bib0030"><span class="elsevierStyleSup">1</span></a> mainly affecting women. High grade anal intraepithelial neoplasia (AIN) is considered to be the precursor of squamous cell cancer of the anus,<a class="elsevierStyleCrossRef" href="#bib0035"><span class="elsevierStyleSup">2</span></a> and an increase in the number of cases has been observed in men who have sex with men (MSM). The incidence of in situ anal cancer in men with human immunodeficiency virus (HIV) infection is 60 times higher than in the general male population, and anal cancer, though not an AIDS-defining malignancy, is 1 of the leading causes of cancer-related death in this population.<a class="elsevierStyleCrossRef" href="#bib0040"><span class="elsevierStyleSup">3</span></a> Human papillomavirus (HPV) acquired through sexual contact has been implicated in the etiology and pathogenesis of AIN. Persistent high-risk HPV infections (particularly viruses 16 and 18) are associated with squamous cell anal cancer (the most common cancer of the anal canal) and its precursor lesions. These viruses have the capacity to integrate their genetic material into the genome of the epithelial basal cell, and through overexpression of oncoproteins E6 and E7 to interfere with programmed cell death in the same way as occurs during genesis of cancer of the cervix. Anal cytology and genotyping for these viruses are the main screening tests employed in at-risk populations,<a class="elsevierStyleCrossRef" href="#bib0045"><span class="elsevierStyleSup">4</span></a> complemented by subsequent biopsy of suspicious lesions.<a class="elsevierStyleCrossRef" href="#bib0050"><span class="elsevierStyleSup">5</span></a></p><p id="par0010" class="elsevierStylePara elsevierViewall">The video shows the complete screening process for AIN. In an initial phase, blind anal cytology is taken, with a sample for HPV genotyping. Hybrid capture is the most widely used test and can distinguish between high- and low-risk viruses. Anal cytology is reported by the pathologist following the 2001 Bethesda system. HPV identification in anal samples is useful in cases in which cytology is negative or inconclusive. To take a cytology sample, the patient is placed in a lateral decubitus position and a dacron swab or cytology brush is inserted about 4<span class="elsevierStyleHsp" style=""></span>cm into the anal canal. Circular movements are then made as the device is withdrawn over at least 20<span class="elsevierStyleHsp" style=""></span>seconds. The exudate is spread onto a glass microscope slide and is fixed with an alcohol solution. To identify HPV, the brush is inserted and rotated and is then placed in a container with a specific transport medium. These 2 tests enable us to select patients who are candidates for anoscopy.</p><p id="par0015" class="elsevierStylePara elsevierViewall">High-resolution anoscopy (HRA), performed after patient preparation with cleansing enemas, is the optimal test for the diagnosis of AIN, as it allows us to take targeted tissue samples. HRA involves visualization of the anal canal using a gynecological colposcope after the application of acetic acid. The patient is placed in the lateral decubitus position and a gauze swab coated in 3% acetic acid solution is inserted and left in place for 3 to 5<span class="elsevierStyleHsp" style=""></span>minutes. After removing the gauze swab, the anoscope is inserted and the colposcope is focused. The anoscope is rotated as it is gradually withdrawn in order to visualize any suspicious acetowhite areas, which appear below the dentate line. Acetic acid reveals epithelial neoplasms and serves as a guide for biopsy mapping. A complementary technique employs Lugol solution (elemental iodine and potassium iodide), which stains normal epithelium and is often used to delimit lesions prior to treatment. When suspicious areas are identified, topical anesthesia is applied with a solution of 10% tetracaine plus 0.1<span class="elsevierStyleHsp" style=""></span>μg/ml epinephrine) and Wolf forceps are used to take samples for histology. Bleeding is usually minimal and can be controlled by applying a swab moistened in an 80% solution of trichloroacetic acid. Depending on the grade of neoplasia reported by the pathologist and on the extension of the lesions, the patient enters a follow-up program is referred to proctology for treatment of the lesions.</p><p id="par0020" class="elsevierStylePara elsevierViewall">Anal cytology and HPV detection in general are indicated in men and women who practice receptive anal sex or who have condylomas in the perianal region.<a class="elsevierStyleCrossRef" href="#bib0050"><span class="elsevierStyleSup">5</span></a> This is especially important in patients with immunosuppression of any cause, and in HIV-positive patients independently of their immune status. Screening every 2 to 3 years in in HIV-negative MSM and annually in HIV-positive MSM is considered optimal and cost-effective for the prevention of cancer of the anus. A history of HPV-related genital neoplasms in women is also considered an indication for screening for AIN. High-resolution anoscopy is indicated in patients with atypia on anal cytology, and is essential in patients with high-grade atypia. Anal cytology and HPV detection have no known contraindications. Targeted biopsy of the anal canal using high-resolution anoscopy is typically a simple procedure and is usually painless and well tolerated. It is contraindicated in anticoagulated or poorly collaborative patients and in those with known allergy to topical anesthetics, though the use of such anesthetics may be omitted in these latter cases, as they are not essential for taking biopsies. The drawbacks of the test are the same as for any minor surgical procedure and include vasovagal episodes in predisposed individuals and intense bleeding due to inappropriate use of the biopsy forceps. Slight spotting and discomfort after defecation is normal in the days after performing the biopsy.</p><p id="par0025" class="elsevierStylePara elsevierViewall">Anal cytology and high-resolution anoscopy are necessary techniques in all clinics with a screening protocol for anal cancer. Screening and treatment protocols for AIN are still not well established and must be adapted to the capacity of each center and to the type of population attended. The long-term influence of the initiation of a screening and treatment protocol for AIN on anal cancer in the at-risk population is unknown.</p></span>" "pdfFichero" => "main.pdf" "tienePdf" => true "NotaPie" => array:1 [ 0 => array:2 [ "etiqueta" => "☆" "nota" => "<p class="elsevierStyleNotepara" id="npar0005">Please cite this article as: Repiso Jiménez JB, Padilla España L, Fernández Morano T, de Troya Martín M. Despistaje de la neoplasia intraepitelial anal. Biopsia de canal anal guiada por anoscopia de alta resolución. Actas Dermosifiliogr. 2017;108:65–66.</p>" ] ] "apendice" => array:1 [ 0 => array:1 [ "seccion" => array:1 [ 0 => array:4 [ "apendice" => "<p id="par0035" class="elsevierStylePara elsevierViewall"><elsevierMultimedia ident="upi0005"></elsevierMultimedia></p>" "etiqueta" => "Appendix A" "titulo" => "Supplementary data" "identificador" => "sec0010" ] ] ] ] "multimedia" => array:1 [ 0 => array:5 [ "identificador" => "upi0005" "tipo" => "MULTIMEDIAECOMPONENTE" "mostrarFloat" => false "mostrarDisplay" => true "Ecomponente" => array:3 [ "fichero" => "mmc1.mp4" "ficheroTamanyo" => 29719439 "Video" => array:2 [ "flv" => array:5 [ "fichero" => "mmc1.flv" "poster" => "mmc1.jpg" "tiempo" => 0 "alto" => 0 "ancho" => 0 ] "mp4" => array:2 [ "fichero" => "mmc1.m4v" "poster" => "mmc1.jpg" ] ] ] ] ] "bibliografia" => array:2 [ "titulo" => "References" "seccion" => array:1 [ 0 => array:2 [ "identificador" => "bibs0005" "bibliografiaReferencia" => array:5 [ 0 => array:3 [ "identificador" => "bib0030" "etiqueta" => "1" "referencia" => array:1 [ 0 => array:1 [ "referenciaCompleta" => "Curado MP, Edwards B, Shin HR, Storm H, Ferlay J, Heanue M, et al. 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| 2021 Marzo | 98 | 40 | 138 |
| 2021 Febrero | 77 | 49 | 126 |
| 2021 Enero | 46 | 40 | 86 |
| 2020 Diciembre | 51 | 33 | 84 |
| 2020 Noviembre | 25 | 24 | 49 |
| 2020 Octubre | 23 | 23 | 46 |
| 2020 Septiembre | 40 | 27 | 67 |
| 2020 Agosto | 34 | 27 | 61 |
| 2020 Julio | 18 | 20 | 38 |
| 2020 Junio | 30 | 41 | 71 |
| 2020 Mayo | 31 | 17 | 48 |
| 2020 Abril | 26 | 13 | 39 |
| 2020 Marzo | 26 | 15 | 41 |
| 2020 Febrero | 4 | 4 | 8 |
| 2020 Enero | 4 | 0 | 4 |
| 2019 Diciembre | 8 | 0 | 8 |
| 2019 Noviembre | 3 | 0 | 3 |
| 2019 Septiembre | 3 | 0 | 3 |
| 2019 Agosto | 4 | 0 | 4 |
| 2019 Julio | 8 | 0 | 8 |
| 2019 Junio | 4 | 0 | 4 |
| 2019 Mayo | 6 | 0 | 6 |
| 2019 Abril | 3 | 4 | 7 |
| 2019 Febrero | 4 | 0 | 4 |
| 2019 Enero | 1 | 0 | 1 |
| 2018 Diciembre | 3 | 0 | 3 |
| 2018 Noviembre | 3 | 0 | 3 |
| 2018 Octubre | 4 | 0 | 4 |
| 2018 Septiembre | 7 | 0 | 7 |
| 2018 Abril | 0 | 1 | 1 |
| 2018 Febrero | 40 | 7 | 47 |
| 2018 Enero | 30 | 7 | 37 |
| 2017 Diciembre | 71 | 5 | 76 |
| 2017 Noviembre | 25 | 6 | 31 |
| 2017 Octubre | 22 | 5 | 27 |
| 2017 Septiembre | 25 | 32 | 57 |
| 2017 Agosto | 42 | 13 | 55 |
| 2017 Julio | 29 | 9 | 38 |
| 2017 Junio | 112 | 10 | 122 |
| 2017 Mayo | 81 | 15 | 96 |
| 2017 Abril | 53 | 15 | 68 |
| 2017 Marzo | 48 | 42 | 90 |
| 2017 Febrero | 81 | 44 | 125 |
| 2017 Enero | 65 | 36 | 101 |
| 2016 Diciembre | 11 | 20 | 31 |
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