Anal fissure differential diagnosis: Difference between revisions

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{{Anal fissure}}
[[Image:Home_logo1.png|right|250px|link=https://www.wikidoc.org/index.php/Anal_fissure]]
{{CMG}};{{AE}}{{ADS}}
{{CMG}}; {{AE}}{{ADS}}


==Overview==
==Overview==
Anal fissure must be differentiated from other diseases that cause anal discomfort and pain with [[defecation]] such as [[hemorrhoids]], [[rectal prolapse]] and [[perianal abscess]], [[anal fistula]] and [[Anal Cancer|anal cancer]].


==Differentiating Anal Fissure from Other Diseases==
==Differentiating Anal Fissure from Other Diseases==
Anal fissure must be differentiated from other diseases that cause anal discomfort and pain with [[defecation]] such as [[hemorrhoids]], [[rectal prolapse]] and [[perianal abscess]]
Anal fissure must be differentiated from other diseases that cause anal discomfort and pain with [[defecation]] such as [[hemorrhoids]], [[rectal prolapse]] and [[perianal abscess]].
{| class="wikitable"
{| class="wikitable"
!style="background: #4479BA; color: #FFFFFF; text-align: center;"|Disease
! style="background: #4479BA; color: #FFFFFF; text-align: center;" |Disease
!style="background: #4479BA; color: #FFFFFF; text-align: center;"|History
! style="background: #4479BA; color: #FFFFFF; text-align: center;" |History
!style="background: #4479BA; color: #FFFFFF; text-align: center;"|Physical exam findings
! style="background: #4479BA; color: #FFFFFF; text-align: center;" |Physical exam findings
!style="background: #4479BA; color: #FFFFFF; text-align: center;"|Sample image
! style="background: #4479BA; color: #FFFFFF; text-align: center;" |Sample image
|-
|-
| style="background: #DCDCDC; padding: 5px; text-align: center;" |[[Anal fissure]]
| style="background: #DCDCDC; padding: 5px; text-align: center;" |[[Anal fissure]]
|style="background: #F5F5F5; padding: 5px; |
| style="background: #F5F5F5; padding: 5px; " |
* [[Fissure|Anal fissure]] usually presents with tearing pain with every bowel movement.<ref name="pmid27041801">{{cite journal |vauthors=Schlichtemeier S, Engel A |title=Anal fissure |journal=Aust Prescr |volume=39 |issue=1 |pages=14–7 |year=2016 |pmid=27041801 |pmc=4816871 |doi=10.18773/austprescr.2016.007 |url=}}</ref>
* [[Fissure|Anal fissure]] usually presents with tearing pain with every bowel movement.<ref name="pmid27041801">{{cite journal |vauthors=Schlichtemeier S, Engel A |title=Anal fissure |journal=Aust Prescr |volume=39 |issue=1 |pages=14–7 |year=2016 |pmid=27041801 |pmc=4816871 |doi=10.18773/austprescr.2016.007 |url=}}</ref>
* Pain usually lasts for minutes to hours after every bowel movement.
* Pain usually lasts for minutes to hours after every bowel movement.
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* About two-thirds of the patients present with bright red blood streaks on toilet papers or on the surface of stools.
* About two-thirds of the patients present with bright red blood streaks on toilet papers or on the surface of stools.
* May be accompanied by [[pruritis]] and [[discharge]].
* May be accompanied by [[pruritis]] and [[discharge]].
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* Most [[Anal fissure|fissures]] occur in the posterior midline of the [[Anus|anal canal]].<ref name="pmid26929749">{{cite journal |vauthors=Beaty JS, Shashidharan M |title=Anal Fissure |journal=Clin Colon Rectal Surg |volume=29 |issue=1 |pages=30–7 |year=2016 |pmid=26929749 |pmc=4755763 |doi=10.1055/s-0035-1570390 |url=}}</ref>
* Most [[Anal fissure|fissures]] occur in the posterior midline of the [[Anus|anal canal]].<ref name="pmid26929749">{{cite journal |vauthors=Beaty JS, Shashidharan M |title=Anal Fissure |journal=Clin Colon Rectal Surg |volume=29 |issue=1 |pages=30–7 |year=2016 |pmid=26929749 |pmc=4755763 |doi=10.1055/s-0035-1570390 |url=}}</ref>
* [[Skin tags]] in the perianal area may accompany [[chronic]] [[anal fissures]].
* [[Skin tags]] in the perianal area may accompany [[chronic]] [[anal fissures]].
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[[Image:Anal fissure 1 - By Bernardo Gui - Own work, Public Domain, httpscommons.wikimedia.orgwindex.phpcurid=8885750.jpg|center|250px|thumb|Anal fissure- By Bernardo Gui<ref> Own work, Public Domain, httpscommons.wikimedia.orgwindex.phpcurid=8885750</ref>]]
[[Image:Anal fissure 1 - By Bernardo Gui - Own work, Public Domain, httpscommons.wikimedia.orgwindex.phpcurid=8885750.jpg|center|250px|thumb|Anal fissure- By Bernardo Gui<ref>Own work, Public Domain, httpscommons.wikimedia.orgwindex.phpcurid=8885750</ref>]]
|-
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| style="background: #DCDCDC; padding: 5px; text-align: center;" |[[Hemorrhoids]]
| style="background: #DCDCDC; padding: 5px; text-align: center;" |[[Hemorrhoids]]
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'''External hemorrhoids'''
'''External hemorrhoids'''
* External hemorrhoids are painful as the skin below the punctate line is sensitive to pain.<sup>[[Hemorrhoids history and symptoms#cite note-pmid28567655-1|[1]]]</sup>
* External hemorrhoids are painful as the skin below the punctate line is sensitive to pain.<sup>[[Hemorrhoids history and symptoms#cite note-pmid28567655-1|[1]]]</sup>
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* The most common symptom of internal hemorrhoids is bright red blood on stool, on toilet paper, or in the toilet bowl after a bowel movement.
* The most common symptom of internal hemorrhoids is bright red blood on stool, on toilet paper, or in the toilet bowl after a bowel movement.
* Internal hemorrhoids that are not prolapsed are usually not painful.
* Internal hemorrhoids that are not prolapsed are usually not painful.
* Prolapsed hemorrhoids often cause pain, discomfort, and anal [[Itch|itching]]
* Prolapsed hemorrhoids often cause pain, discomfort, and anal [[Itch|itching]].
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'''Skin examination'''
'''Skin examination'''
* Inspection of the [[anal verge]] may show scratch marks and [[skin tags]].
* Inspection of the [[anal verge]] may show scratch marks and [[skin tags]].
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* [[Thrombosed]] hemorrhoids are tender to palpation.
* [[Thrombosed]] hemorrhoids are tender to palpation.
* Internal hemorrhoids are not palpable by [[digital rectal examination]] and the use of [[Anoscopy|anoscope]] is mandatory.
* Internal hemorrhoids are not palpable by [[digital rectal examination]] and the use of [[Anoscopy|anoscope]] is mandatory.
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[[Image:Haemorrhoiden 1Grad endo 01 - By Dr. Joachim Guntau - www.Endoskopiebilder.de, CC BY-SA 3.0, httpscommons.wikimedia.orgwindex.phpcurid=18660115.jpg|center|250px|thumb| External hemorrhoids - By Dr. Joachim Guntau<ref> - www.Endoskopiebilder.de, CC BY-SA 3.0, httpscommons.wikimedia.orgwindex.phpcurid=18660115</ref>]]
[[Image:Haemorrhoiden 1Grad endo 01 - By Dr. Joachim Guntau - www.Endoskopiebilder.de, CC BY-SA 3.0, httpscommons.wikimedia.orgwindex.phpcurid=18660115.jpg|center|250px|thumb| External hemorrhoids - By Dr. Joachim Guntau<ref>- www.Endoskopiebilder.de, CC BY-SA 3.0, httpscommons.wikimedia.orgwindex.phpcurid=18660115</ref>]]
|-
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| style="background: #DCDCDC; padding: 5px; text-align: center;" |[[Rectal prolapse]]
| style="background: #DCDCDC; padding: 5px; text-align: center;" |[[Rectal prolapse]]
|style="background: #F5F5F5; padding: 5px; |
| style="background: #F5F5F5; padding: 5px; " |
* [[Rectal prolapse]] most commonly occurs in multiparous females over 40 years old.<ref name="pmid28144208">{{cite journal |vauthors=Cannon JA |title=Evaluation, Diagnosis, and Medical Management of Rectal Prolapse |journal=Clin Colon Rectal Surg |volume=30 |issue=1 |pages=16–21 |year=2017 |pmid=28144208 |doi=10.1055/s-0036-1593431 |url=}}</ref>
* [[Rectal prolapse]] most commonly occurs in multiparous females over 40 years old.<ref name="pmid28144208">{{cite journal |vauthors=Cannon JA |title=Evaluation, Diagnosis, and Medical Management of Rectal Prolapse |journal=Clin Colon Rectal Surg |volume=30 |issue=1 |pages=16–21 |year=2017 |pmid=28144208 |doi=10.1055/s-0036-1593431 |url=}}</ref>
* Appears as a progressive mass protrusion from the [[anus]]. The protrusion first appears with straining and defecation, then progresses to the degree when it is no longer replaced back.
* Appears as a progressive mass protrusion from the [[anus]]. The protrusion first appears with straining and defecation, then progresses to the degree when it is no longer replaced back.
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* [[Fecal incontinence]] and anal discharge.
* [[Fecal incontinence]] and anal discharge.
* Pain is not usually present.
* Pain is not usually present.
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| style="background: #F5F5F5; padding: 5px; " |
* Mass protruding from the [[anus]].<ref name="pmid28144206">{{cite journal |vauthors=Blaker K, Anandam JL |title=Functional Disorders: Rectoanal Intussusception |journal=Clin Colon Rectal Surg |volume=30 |issue=1 |pages=5–11 |year=2017 |pmid=28144206 |doi=10.1055/s-0036-1593433 |url=}}</ref>
* Mass protruding from the [[anus]].<ref name="pmid28144206">{{cite journal |vauthors=Blaker K, Anandam JL |title=Functional Disorders: Rectoanal Intussusception |journal=Clin Colon Rectal Surg |volume=30 |issue=1 |pages=5–11 |year=2017 |pmid=28144206 |doi=10.1055/s-0036-1593433 |url=}}</ref>
* Concentric mucosal rings are characteristic of [[rectal prolapse]].
* Concentric mucosal rings are characteristic of [[rectal prolapse]].
|style="background: #F5F5F5; padding: 5px; |
| style="background: #F5F5F5; padding: 5px; " |
[[Image:Prolapse of rectum 01- By Dr. K.-H. Günther, Klinikum Main Spessart, Lohr am Main - Dr. K.-H. Günther, Klinikum Main Spessart, Lohr am Main, CC BY 3.0, httpscommons.wikimedia.orgwindex.phpcurid=20649968.jpg|center|250px|thumb|Rectal prolapse - By Dr. K.-H. Günther, Klinikum Main Spessart, Lohr am Main - Dr. K.-H. Günther, Klinikum Main Spessart, Lohr am Main, <ref>CC BY 3.0, httpscommons.wikimedia.orgwindex.phpcurid=20649968</ref>]]
[[Image:Prolapse of rectum 01- By Dr. K.-H. Günther, Klinikum Main Spessart, Lohr am Main - Dr. K.-H. Günther, Klinikum Main Spessart, Lohr am Main, CC BY 3.0, httpscommons.wikimedia.orgwindex.phpcurid=20649968.jpg|center|250px|thumb|Rectal prolapse - By Dr. K.-H. Günther, Klinikum Main Spessart, Lohr am Main - Dr. K.-H. Günther, Klinikum Main Spessart, Lohr am Main, <ref>CC BY 3.0, httpscommons.wikimedia.orgwindex.phpcurid=20649968</ref>]]
|-
|-
| style="background: #DCDCDC; padding: 5px; text-align: center;" |[[Perianal abscess]]
| style="background: #DCDCDC; padding: 5px; text-align: center;" |[[Perianal abscess]]
|style="background: #F5F5F5; padding: 5px; |
| style="background: #F5F5F5; padding: 5px; " |
* [[Perianal abscess]] presents with severe, continuous, dull, aching pain in the perianal area.<ref name="pmid28223268">{{cite journal |vauthors=Sahnan K, Adegbola SO, Tozer PJ, Watfah J, Phillips RK |title=Perianal abscess |journal=BMJ |volume=356 |issue= |pages=j475 |year=2017 |pmid=28223268 |doi= |url=}}</ref>
* [[Perianal abscess]] presents with severe, continuous, dull, aching pain in the perianal area.<ref name="pmid28223268">{{cite journal |vauthors=Sahnan K, Adegbola SO, Tozer PJ, Watfah J, Phillips RK |title=Perianal abscess |journal=BMJ |volume=356 |issue= |pages=j475 |year=2017 |pmid=28223268 |doi= |url=}}</ref>
* Pain is exacerbated with bowel movements, but is not exclusive to it.
* Pain is exacerbated with bowel movements, but is not exclusive to it.
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* [[Fever]], [[headache]], and [[chills]] may accompany the pain.
* [[Fever]], [[headache]], and [[chills]] may accompany the pain.
* If the [[abscess]] starts to drain, discharge of purulent or bloody fluid may be noticed.
* If the [[abscess]] starts to drain, discharge of purulent or bloody fluid may be noticed.
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* Flatulent, [[erythematous]], and tender area of skin overlying the [[abscess]].
* Flatulent, [[erythematous]], and tender area of skin overlying the [[abscess]].
* If [[abscess]] is deep, tenderness is elicited with digital rectal examination.
* If [[abscess]] is deep, tenderness is elicited with digital rectal examination.
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| style="background: #DCDCDC; padding: 5px; text-align: center;" |[[Anal cancer]]
| style="background: #DCDCDC; padding: 5px; text-align: center;" |[[Anal cancer]]
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| style="background: #F5F5F5; padding: 5px; " |
* Rectal bleeding is the most common presentation.<ref name="pmid28610905">{{cite journal |vauthors=Moureau-Zabotto L, Vendrely V, Abramowitz L, Borg C, Francois E, Goere D, Huguet F, Peiffert D, Siproudhis L, Ducreux M, Bouché O |title=Anal cancer: French Intergroup Clinical Practice Guidelines for diagnosis, treatment and follow-up |journal=Dig Liver Dis |volume= |issue= |pages= |year=2017 |pmid=28610905 |doi=10.1016/j.dld.2017.05.011 |url=}}</ref>
* Rectal bleeding is the most common presentation.<ref name="pmid28610905">{{cite journal |vauthors=Moureau-Zabotto L, Vendrely V, Abramowitz L, Borg C, Francois E, Goere D, Huguet F, Peiffert D, Siproudhis L, Ducreux M, Bouché O |title=Anal cancer: French Intergroup Clinical Practice Guidelines for diagnosis, treatment and follow-up |journal=Dig Liver Dis |volume= |issue= |pages= |year=2017 |pmid=28610905 |doi=10.1016/j.dld.2017.05.011 |url=}}</ref>
* Mass sensation in the [[anus]].
* Mass sensation in the [[anus]].
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* Patient may give a history of anal [[condyloma]] (especially homosexual men).<ref name="pmid28528690">{{cite journal |vauthors=Prigge ES, von Knebel Doeberitz M, Reuschenbach M |title=Clinical relevance and implications of HPV-induced neoplasia in different anatomical locations |journal=Mutat. Res. |volume=772 |issue= |pages=51–66 |year=2017 |pmid=28528690 |doi=10.1016/j.mrrev.2016.06.005 |url=}}</ref>
* Patient may give a history of anal [[condyloma]] (especially homosexual men).<ref name="pmid28528690">{{cite journal |vauthors=Prigge ES, von Knebel Doeberitz M, Reuschenbach M |title=Clinical relevance and implications of HPV-induced neoplasia in different anatomical locations |journal=Mutat. Res. |volume=772 |issue= |pages=51–66 |year=2017 |pmid=28528690 |doi=10.1016/j.mrrev.2016.06.005 |url=}}</ref>
* Fecal incontinence.
* Fecal incontinence.
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* On digital rectal examination, solid hemorrhagic mass that is firmly fixed to the surrounding structures is noted.
* On digital rectal examination, solid hemorrhagic mass that is firmly fixed to the surrounding structures is noted.
* Femoral and inguinal [[lymph nodes]] may show [[lymphadenopathy]] secondary to spread of cancer.
* Femoral and inguinal [[lymph nodes]] may show [[lymphadenopathy]] secondary to spread of cancer.
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[[Image:Anal CA - By Internet Archive Book Images - httpswww.flickr.comphotosinternetarchivebookimages14598073128Source book page httpsarchive.orgstreamdiseasesofrectum00gantdiseasesofrectum00gant-pagen653mode1up, No restrictions, httpsc.jpg|center|250px|thumb|Anal Cancer - By Internet Archive Book<ref> Images - httpswww.flickr.comphotosinternetarchivebookimages14598073128Source book page httpsarchive.orgstreamdiseasesofrectum00gantdiseasesofrectum00gant-pagen653mode1up, No restrictions</ref>]]
[[Image:Anal CA - By Internet Archive Book Images - httpswww.flickr.comphotosinternetarchivebookimages14598073128Source book page httpsarchive.orgstreamdiseasesofrectum00gantdiseasesofrectum00gant-pagen653mode1up, No restrictions, httpsc.jpg|center|250px|thumb|Anal Cancer - By Internet Archive Book<ref>Images - httpswww.flickr.comphotosinternetarchivebookimages14598073128Source book page httpsarchive.orgstreamdiseasesofrectum00gantdiseasesofrectum00gant-pagen653mode1up, No restrictions</ref>]]
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| style="background: #DCDCDC; padding: 5px; text-align: center;" |[[Condylomata acuminata]]
| style="background: #DCDCDC; padding: 5px; text-align: center;" |[[Condylomata acuminata]]
|style="background: #F5F5F5; padding: 5px; |
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* Patient may give a history of unprotected anal sex with an infected partner.
* Patient may give a history of unprotected anal sex with an infected partner.
* Having multiple sexual partners is a risk factor and should be investigated.<ref name="pmid28160045">{{cite journal |vauthors=Wieland U, Kreuter A |title=[Genital warts in HIV-infected individuals] |language=German |journal=Hautarzt |volume=68 |issue=3 |pages=192–198 |year=2017 |pmid=28160045 |doi=10.1007/s00105-017-3938-z |url=}}</ref>
* Having multiple sexual partners is a risk factor and should be investigated.<ref name="pmid28160045">{{cite journal |vauthors=Wieland U, Kreuter A |title=[Genital warts in HIV-infected individuals] |language=German |journal=Hautarzt |volume=68 |issue=3 |pages=192–198 |year=2017 |pmid=28160045 |doi=10.1007/s00105-017-3938-z |url=}}</ref>
* [[Condyloma acuminata]] presents with painless warts that vary in size, shape, and color.
* [[Condyloma acuminata]] presents with painless warts that vary in size, shape, and color.
* [[ Pruritis]] and discharge may accompany the warts.
* [[ Pruritis]] and discharge may accompany the warts.
|style="background: #F5F5F5; padding: 5px; |
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* Anal [[condyloma acuminata]] may be accompanied by cervical, vaginal, or even ororpharyngeal warts, so the patient should be examined thoroughly.<ref name="pmid27364818">{{cite journal |vauthors=Köhn FM, Schultheiss D, Krämer-Schultheiss K |title=[Dermatological diseases of the external male genitalia : Part 2: Infectious and malignant dermatological] |language=German |journal=Urologe A |volume=55 |issue=7 |pages=981–96 |year=2016 |pmid=27364818 |doi=10.1007/s00120-016-0163-9 |url=}}</ref>
* Anal [[condyloma acuminata]] may be accompanied by cervical, vaginal, or even ororpharyngeal warts, so the patient should be examined thoroughly.<ref name="pmid27364818">{{cite journal |vauthors=Köhn FM, Schultheiss D, Krämer-Schultheiss K |title=[Dermatological diseases of the external male genitalia : Part 2: Infectious and malignant dermatological] |language=German |journal=Urologe A |volume=55 |issue=7 |pages=981–96 |year=2016 |pmid=27364818 |doi=10.1007/s00120-016-0163-9 |url=}}</ref>
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==References==
==References==
{{Reflist|2}}
{{Reflist|2}}
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Latest revision as of 20:23, 29 July 2020

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Amandeep Singh M.D.[2]

Overview

Anal fissure must be differentiated from other diseases that cause anal discomfort and pain with defecation such as hemorrhoids, rectal prolapse and perianal abscess, anal fistula and anal cancer.

Differentiating Anal Fissure from Other Diseases

Anal fissure must be differentiated from other diseases that cause anal discomfort and pain with defecation such as hemorrhoids, rectal prolapse and perianal abscess.

Disease History Physical exam findings Sample image
Anal fissure
  • Anal fissure usually presents with tearing pain with every bowel movement.[1]
  • Pain usually lasts for minutes to hours after every bowel movement.
  • Patient is typically afraid of going to the bathroom to avoid the pain, which leads to a viscious cycle. The fissure worsens the constipation and the constipation (hard stool) aggravates the fissure.
  • About two-thirds of the patients present with bright red blood streaks on toilet papers or on the surface of stools.
  • May be accompanied by pruritis and discharge.
Anal fissure- By Bernardo Gui[3]
Hemorrhoids

External hemorrhoids

  • External hemorrhoids are painful as the skin below the punctate line is sensitive to pain.[1]
  • Blood clots may form in external hemorrhoids.
  • Thrombosed external hemorrhoids cause bleeding, painful swelling, or a hard lump around the anus.
  • When the blood clot dissolves, extra skin is left behind. This skin can become irritated or itch.
  • Excessive straining, rubbing, or cleaning around the anus may make symptoms, such as itching and irritation, worse.

Internal hemorrhoids

  • The most common symptom of internal hemorrhoids is bright red blood on stool, on toilet paper, or in the toilet bowl after a bowel movement.
  • Internal hemorrhoids that are not prolapsed are usually not painful.
  • Prolapsed hemorrhoids often cause pain, discomfort, and anal itching.

Skin examination

  • Inspection of the anal verge may show scratch marks and skin tags.
  • Inspection also may reveal external hemorrhoids or prolapsed internal hemorrhoids.

Digital rectal examination

External hemorrhoids - By Dr. Joachim Guntau[4]
Rectal prolapse
  • Rectal prolapse most commonly occurs in multiparous females over 40 years old.[5]
  • Appears as a progressive mass protrusion from the anus. The protrusion first appears with straining and defecation, then progresses to the degree when it is no longer replaced back.
  • It presents with abdominal discomfort and incomplete defecation.
  • Fecal incontinence and anal discharge.
  • Pain is not usually present.
Rectal prolapse - By Dr. K.-H. Günther, Klinikum Main Spessart, Lohr am Main - Dr. K.-H. Günther, Klinikum Main Spessart, Lohr am Main, [7]
Perianal abscess
  • Perianal abscess presents with severe, continuous, dull, aching pain in the perianal area.[8]
  • Pain is exacerbated with bowel movements, but is not exclusive to it.
  • Constipation due to fear of bowel movements.
  • Fever, headache, and chills may accompany the pain.
  • If the abscess starts to drain, discharge of purulent or bloody fluid may be noticed.
  • Flatulent, erythematous, and tender area of skin overlying the abscess.
  • If abscess is deep, tenderness is elicited with digital rectal examination.
Anal cancer
  • Rectal bleeding is the most common presentation.[9]
  • Mass sensation in the anus.
  • Mucoid discharge may occur.
  • Patient may give a history of anal condyloma (especially homosexual men).[10]
  • Fecal incontinence.
  • On digital rectal examination, solid hemorrhagic mass that is firmly fixed to the surrounding structures is noted.
  • Femoral and inguinal lymph nodes may show lymphadenopathy secondary to spread of cancer.
Anal Cancer - By Internet Archive Book[11]
Condylomata acuminata
  • Patient may give a history of unprotected anal sex with an infected partner.
  • Having multiple sexual partners is a risk factor and should be investigated.[12]
  • Condyloma acuminata presents with painless warts that vary in size, shape, and color.
  • Pruritis and discharge may accompany the warts.
  • Anal condyloma acuminata may be accompanied by cervical, vaginal, or even ororpharyngeal warts, so the patient should be examined thoroughly.[13]

References

  1. ↑ Schlichtemeier S, Engel A (2016). "Anal fissure". Aust Prescr. 39 (1): 14–7. doi:10.18773/austprescr.2016.007. PMC 4816871. PMID 27041801.
  2. ↑ Beaty JS, Shashidharan M (2016). "Anal Fissure". Clin Colon Rectal Surg. 29 (1): 30–7. doi:10.1055/s-0035-1570390. PMC 4755763. PMID 26929749.
  3. ↑ Own work, Public Domain, httpscommons.wikimedia.orgwindex.phpcurid=8885750
  4. ↑ - www.Endoskopiebilder.de, CC BY-SA 3.0, httpscommons.wikimedia.orgwindex.phpcurid=18660115
  5. ↑ Cannon JA (2017). "Evaluation, Diagnosis, and Medical Management of Rectal Prolapse". Clin Colon Rectal Surg. 30 (1): 16–21. doi:10.1055/s-0036-1593431. PMID 28144208.
  6. ↑ Blaker K, Anandam JL (2017). "Functional Disorders: Rectoanal Intussusception". Clin Colon Rectal Surg. 30 (1): 5–11. doi:10.1055/s-0036-1593433. PMID 28144206.
  7. ↑ CC BY 3.0, httpscommons.wikimedia.orgwindex.phpcurid=20649968
  8. ↑ Sahnan K, Adegbola SO, Tozer PJ, Watfah J, Phillips RK (2017). "Perianal abscess". BMJ. 356: j475. PMID 28223268.
  9. ↑ Moureau-Zabotto L, Vendrely V, Abramowitz L, Borg C, Francois E, Goere D, Huguet F, Peiffert D, Siproudhis L, Ducreux M, Bouché O (2017). "Anal cancer: French Intergroup Clinical Practice Guidelines for diagnosis, treatment and follow-up". Dig Liver Dis. doi:10.1016/j.dld.2017.05.011. PMID 28610905.
  10. ↑ Prigge ES, von Knebel Doeberitz M, Reuschenbach M (2017). "Clinical relevance and implications of HPV-induced neoplasia in different anatomical locations". Mutat. Res. 772: 51–66. doi:10.1016/j.mrrev.2016.06.005. PMID 28528690.
  11. ↑ Images - httpswww.flickr.comphotosinternetarchivebookimages14598073128Source book page httpsarchive.orgstreamdiseasesofrectum00gantdiseasesofrectum00gant-pagen653mode1up, No restrictions
  12. ↑ Wieland U, Kreuter A (2017). "[Genital warts in HIV-infected individuals]". Hautarzt (in German). 68 (3): 192–198. doi:10.1007/s00105-017-3938-z. PMID 28160045.
  13. ↑ Köhn FM, Schultheiss D, Krämer-Schultheiss K (2016). "[Dermatological diseases of the external male genitalia : Part 2: Infectious and malignant dermatological]". Urologe A (in German). 55 (7): 981–96. doi:10.1007/s00120-016-0163-9. PMID 27364818.

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