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==Overview== | ==Overview== | ||
Dysphagia | Dysphagia can be caused by many diseases such as neurological disorders, structural disorders of esophagus, tumors and motor disorders. | ||
==Causes== | ==Causes== | ||
Depending upon the type of dysphagia, causes can be categorized into two subsections.<ref name="pmid23943072">{{cite journal| author=Starmer HM, Riley LH, Hillel AT, Akst LM, Best SR, Gourin CG| title=Dysphagia, short-term outcomes, and cost of care after anterior cervical disc surgery. | journal=Dysphagia | year= 2014 | volume= 29 | issue= 1 | pages= 68-77 | pmid=23943072 | doi=10.1007/s00455-013-9482-9 | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=23943072 }} </ref><ref name="pmid27840183">{{cite journal| author=Inayat F, Hussain Q, Shafique K| title=Dysphagia Caused by Extrinsic Esophageal Compression From Mediastinal Lymphadenopathy in Patients With Sarcoidosis. | journal=Clin Gastroenterol Hepatol | year= 2017 | volume= 15 | issue= 7 | pages= e119-e120 | pmid=27840183 | doi=10.1016/j.cgh.2016.11.010 | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=27840183 }} </ref><ref name="pmid16187198">{{cite journal| author=Oda K, Iwakiri R, Hara M, Watanabe K, Danjo A, Shimoda R et al.| title=Dysphagia associated with gastroesophageal reflux disease is improved by proton pump inhibitor. | journal=Dig Dis Sci | year= 2005 | volume= 50 | issue= 10 | pages= 1921-6 | pmid=16187198 | doi=10.1007/s10620-005-2962-5 | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=16187198 }} </ref><ref name="pmid25341679">{{cite journal| author=Roman S, Kahrilas PJ| title=The diagnosis and management of hiatus hernia. | journal=BMJ | year= 2014 | volume= 349 | issue= | pages= g6154 | pmid=25341679 | doi=10.1136/bmj.g6154 | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=25341679 }} </ref> | |||
===Common Causes of Oropharyngeal Dysphagia=== | ===Common Causes of Oropharyngeal Dysphagia=== | ||
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! colspan="3" |Common causes of oropharyngeal dysphagia | ! colspan="3" |Common causes of oropharyngeal dysphagia | ||
|- | |- | ||
!Neurological | |||
!Medication side effects | |||
!Others | |||
|- | |- | ||
| | | | ||
* Stroke | * [[Stroke]] | ||
* Parkinson's disease | * [[Parkinson's disease]] | ||
* Occulopharyngeal dystrophy | * Occulopharyngeal dystrophy | ||
* Amyotrophic lateral sclerosis | * [[Amyotrophic lateral sclerosis]] | ||
* Myasthenia gravis | * [[Myasthenia gravis]] | ||
| | | | ||
* | * [[Sedatives]] | ||
* Hypnotic agents | * [[Hypnotics|Hypnotic agents]] | ||
* [[ | * [[Anticonvulsants]] | ||
* [[ | * [[Neuroleptics]] | ||
* [[ | * [[Antihistamines]] | ||
* [[ | * [[Barbiturates]] | ||
* | * [[Antiepileptics]] | ||
* [[Corticosteroids]] | |||
* [[Tetracycline]] | |||
* [[L-tryptophan]] | |||
* [[Anticholinergics|Anticholinergics.]] | |||
| | | | ||
* Radiotherapy of the head and neck | * [[Radiation therapy|Radiotherapy]] of the head and neck | ||
* Pharyngitis | * [[Pharyngitis]] | ||
* Cervical web or rings | * Cervical web or rings | ||
* Dental | * Dental disease | ||
* Oral candidiasis | * [[Oral candidiasis]] | ||
* Tetanus | * [[Tetanus]] | ||
* Lead poisoning | * [[Lead poisoning]] | ||
* Rabies | * [[Rabies]] | ||
|} | |} | ||
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The common causes of esophageal dysphagia can be divided into four categories.<ref name="pmid24513804">{{cite journal| author=Xiao Y, Kahrilas PJ, Nicodème F, Lin Z, Roman S, Pandolfino JE| title=Lack of correlation between HRM metrics and symptoms during the manometric protocol. | journal=Am J Gastroenterol | year= 2014 | volume= 109 | issue= 4 | pages= 521-6 | pmid=24513804 | doi=10.1038/ajg.2014.13 | pmc=4120962 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=24513804 }} </ref><ref name="pmid21480936">{{cite journal| author=Enestvedt BK, Williams JL, Sonnenberg A| title=Epidemiology and practice patterns of achalasia in a large multi-centre database. | journal=Aliment Pharmacol Ther | year= 2011 | volume= 33 | issue= 11 | pages= 1209-14 | pmid=21480936 | doi=10.1111/j.1365-2036.2011.04655.x | pmc=3857989 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=21480936 }} </ref><ref name="pmid1398223">{{cite journal| author=Howard PJ, Maher L, Pryde A, Cameron EW, Heading RC| title=Five year prospective study of the incidence, clinical features, and diagnosis of achalasia in Edinburgh. | journal=Gut | year= 1992 | volume= 33 | issue= 8 | pages= 1011-5 | pmid=1398223 | doi= | pmc=1379432 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=1398223 }} </ref><ref name="pmid25965233">{{cite journal| author=Pandolfino JE, Gawron AJ| title=Achalasia: a systematic review. | journal=JAMA | year= 2015 | volume= 313 | issue= 18 | pages= 1841-52 | pmid=25965233 | doi=10.1001/jama.2015.2996 | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=25965233 }} </ref><ref name="pmid12850684">{{cite journal| author=Gockel I, Lord RV, Bremner CG, Crookes PF, Hamrah P, DeMeester TR| title=The hypertensive lower esophageal sphincter: a motility disorder with manometric features of outflow obstruction. | journal=J Gastrointest Surg | year= 2003 | volume= 7 | issue= 5 | pages= 692-700 | pmid=12850684 | doi= | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=12850684 }} </ref> | The common causes of esophageal dysphagia can be divided into four categories.<ref name="pmid24513804">{{cite journal| author=Xiao Y, Kahrilas PJ, Nicodème F, Lin Z, Roman S, Pandolfino JE| title=Lack of correlation between HRM metrics and symptoms during the manometric protocol. | journal=Am J Gastroenterol | year= 2014 | volume= 109 | issue= 4 | pages= 521-6 | pmid=24513804 | doi=10.1038/ajg.2014.13 | pmc=4120962 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=24513804 }} </ref><ref name="pmid21480936">{{cite journal| author=Enestvedt BK, Williams JL, Sonnenberg A| title=Epidemiology and practice patterns of achalasia in a large multi-centre database. | journal=Aliment Pharmacol Ther | year= 2011 | volume= 33 | issue= 11 | pages= 1209-14 | pmid=21480936 | doi=10.1111/j.1365-2036.2011.04655.x | pmc=3857989 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=21480936 }} </ref><ref name="pmid1398223">{{cite journal| author=Howard PJ, Maher L, Pryde A, Cameron EW, Heading RC| title=Five year prospective study of the incidence, clinical features, and diagnosis of achalasia in Edinburgh. | journal=Gut | year= 1992 | volume= 33 | issue= 8 | pages= 1011-5 | pmid=1398223 | doi= | pmc=1379432 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=1398223 }} </ref><ref name="pmid25965233">{{cite journal| author=Pandolfino JE, Gawron AJ| title=Achalasia: a systematic review. | journal=JAMA | year= 2015 | volume= 313 | issue= 18 | pages= 1841-52 | pmid=25965233 | doi=10.1001/jama.2015.2996 | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=25965233 }} </ref><ref name="pmid12850684">{{cite journal| author=Gockel I, Lord RV, Bremner CG, Crookes PF, Hamrah P, DeMeester TR| title=The hypertensive lower esophageal sphincter: a motility disorder with manometric features of outflow obstruction. | journal=J Gastrointest Surg | year= 2003 | volume= 7 | issue= 5 | pages= 692-700 | pmid=12850684 | doi= | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=12850684 }} </ref> | ||
{| class="wikitable" | {| class="wikitable" | ||
!Structural (Mechanical) | ! colspan="4" |Structural (Mechanical) disorders | ||
!Esophageal tumors | ! colspan="2" |Motor disorders | ||
!Systemic diseases | ! rowspan="2" |Esophageal tumors | ||
! | ! rowspan="2" |Systemic diseases | ||
! rowspan="2" |Miscellaneous | |||
|- | |- | ||
|'''Intrinsic compression | ! colspan="2" |'''Intrinsic compression''' | ||
! colspan="2" |'''Extrinsic Compression''' | |||
* | !'''Primary''' | ||
* | !'''Secondary''' | ||
|- | |||
|'''Mucosal rings and webs''' | |||
* [[Schatzki ring|Schatzki]] | |||
* | * [[Plummer-Vinson syndrome|Plummer-Vinson]] | ||
* | * Multiringed esophagus [[Eosinophilic esophagitis|(eosinophilic esophagitis]]) | ||
|'''Strictures:''' | |||
* [[Peptic ulcer|PUD]] | |||
''' | * [[Caustic]] | ||
* Mediastinal masses: | * Pill-induced | ||
** Lung cancer | * Radiation-induced | ||
** Lymphoma | |'''Vascular compression:''' | ||
** | * Dysphagia lusoria (aberrant right subclavian artery) | ||
** Thyromegaly | * Dysphagia aortica (right-sided aorta) | ||
* | * [[Cardiomegaly|Cardio-megaly]] (enlarged left atrium) | ||
** | | | ||
** | * '''Mediastinal masses:''' | ||
** | ** [[Lung cancer]] | ||
** [[Lymphoma]] | |||
** [[Lymphadenopathy]] | |||
** [[Thyromegaly]] | |||
| | |||
* [[Achalasia]] | |||
* [[Diffuse esophageal spasm]] | |||
* Hypertensive lower esophageal sphincter | |||
* Ineffective esophageal motility disorder | |||
* [[Nutcracker esophagus]] | |||
| | |||
* Connective tissue diseases | |||
* [[Scleroderma]] | |||
* [[CREST syndrome]] | |||
* [[Diabetes mellitus|Diabetes]] | |||
* [[Chagas disease]] | |||
* [[Paraneoplastic syndrome]] | |||
| | | | ||
* Adenocarcinoma | * [[Adenocarcinoma]] | ||
* Squamous cell carcinoma | * [[Squamous cell carcinoma]] | ||
* Metastatic (breast or melanoma) | * Metastatic (breast or melanoma) | ||
* Leiomyoma, lymphoma, or granular cell tumor | * [[Leiomyoma]], [[lymphoma]], or [[granular cell tumor]] | ||
| | | | ||
* Scleroderma (multifactorial) | * [[Scleroderma]] (multifactorial) | ||
* Pemphigus/pemphigoid | * Pemphigus/pemphigoid | ||
* Lichen planus | * [[Lichen planus]] | ||
* Crohn’s disease | * [[Crohn's disease|Crohn’s disease]] | ||
| | | | ||
* Postsurgery (laryngeal, esophageal, or gastric cancers) | * Postsurgery ([[Laryngeal cancer|laryngeal]], [[Esophageal cancer|esophageal]], or [[Stomach cancer|gastric cancers]]) | ||
* Acute esophageal infections | * Acute [[Esophagitis|esophageal infections]] | ||
* Esophageal diverticulae | * Esophageal diverticulae | ||
* Foreign bodies | * Foreign bodies | ||
|} | |} | ||
=== | ===Less Common Causes=== | ||
Less common causes of dysphagia include: | |||
* Scleredema adultorum<ref name="pmid29280826">{{cite journal| author=Chatterjee S, Hedman BJ, Kirby DF| title=An Unusual Cause of Dysphagia. | journal=J Clin Rheumatol | year= 2017 | volume= | issue= | pages= | pmid=29280826 | doi=10.1097/RHU.0000000000000666 | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=29280826 }} </ref><ref name="pmid7064968">{{cite journal| author=Wright RA, Bernie H| title=Scleredema adultorum of Buschke with upper esophageal involvement. | journal=Am J Gastroenterol | year= 1982 | volume= 77 | issue= 1 | pages= 9-11 | pmid=7064968 | doi= | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=7064968 }} </ref> | * Scleredema adultorum<ref name="pmid29280826">{{cite journal| author=Chatterjee S, Hedman BJ, Kirby DF| title=An Unusual Cause of Dysphagia. | journal=J Clin Rheumatol | year= 2017 | volume= | issue= | pages= | pmid=29280826 | doi=10.1097/RHU.0000000000000666 | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=29280826 }} </ref><ref name="pmid7064968">{{cite journal| author=Wright RA, Bernie H| title=Scleredema adultorum of Buschke with upper esophageal involvement. | journal=Am J Gastroenterol | year= 1982 | volume= 77 | issue= 1 | pages= 9-11 | pmid=7064968 | doi= | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=7064968 }} </ref> | ||
* Post chemotherapy and radiation therapy<ref name="pmid11920484">{{cite journal| author=Nguyen NP, Sallah S, Karlsson U, Antoine JE| title=Combined chemotherapy and radiation therapy for head and neck malignancies: quality of life issues. | journal=Cancer | year= 2002 | volume= 94 | issue= 4 | pages= 1131-41 | pmid=11920484 | doi= | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=11920484 }} </ref> | * Post chemotherapy and radiation therapy<ref name="pmid11920484">{{cite journal| author=Nguyen NP, Sallah S, Karlsson U, Antoine JE| title=Combined chemotherapy and radiation therapy for head and neck malignancies: quality of life issues. | journal=Cancer | year= 2002 | volume= 94 | issue= 4 | pages= 1131-41 | pmid=11920484 | doi= | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=11920484 }} </ref> | ||
* Descending thoracic aorta aneurysm<ref name="Conte1966">{{cite journal|last1=Conte|first1=Blagio A.|title=Dysphagia Caused by an Aneurysm of the Descending Thoracic Aorta|journal=New England Journal of Medicine|volume=274|issue=17|year=1966|pages=956–957|issn=0028-4793|doi=10.1056/NEJM196604282741710}}</ref> | * Descending thoracic aorta aneurysm<ref name="Conte1966">{{cite journal|last1=Conte|first1=Blagio A.|title=Dysphagia Caused by an Aneurysm of the Descending Thoracic Aorta|journal=New England Journal of Medicine|volume=274|issue=17|year=1966|pages=956–957|issn=0028-4793|doi=10.1056/NEJM196604282741710}}</ref> | ||
* Hypertrophy of cricopharyngeal muscles<ref name="BenedictSweet1955">{{cite journal|last1=Benedict|first1=Edward B.|last2=Sweet|first2=Richard H.|title=Dysphagia Due to Hypertrophy of the Cricopharyngeus Muscle or Hypopharyngeal Bar|journal=New England Journal of Medicine|volume=253|issue=26|year=1955|pages=1161–1162|issn=0028-4793|doi=10.1056/NEJM195512292532607}}</ref> | * Hypertrophy of cricopharyngeal muscles<ref name="BenedictSweet1955">{{cite journal|last1=Benedict|first1=Edward B.|last2=Sweet|first2=Richard H.|title=Dysphagia Due to Hypertrophy of the Cricopharyngeus Muscle or Hypopharyngeal Bar|journal=New England Journal of Medicine|volume=253|issue=26|year=1955|pages=1161–1162|issn=0028-4793|doi=10.1056/NEJM195512292532607}}</ref> | ||
===Causes by Organ System=== | ===Causes by Organ System=== | ||
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==References== | ==References== | ||
{{Reflist|2}} | {{Reflist|2}} | ||
{{WH}} | |||
{{WS}} | |||
[[Category:Crowdiagnosis]] | [[Category:Crowdiagnosis]] | ||
[[Category:Geriatrics]] | [[Category:Geriatrics]] | ||
[[Category:Gastroenterology]] | [[Category:Gastroenterology]] | ||
[[Category:Otolaryngology]] | [[Category:Otolaryngology]] | ||
Latest revision as of 21:30, 29 July 2020
Dysphagia Microchapters |
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Dysphagia causes On the Web |
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Feham Tariq, MD [2]Kiran Singh, M.D. [3]
Overview
Dysphagia can be caused by many diseases such as neurological disorders, structural disorders of esophagus, tumors and motor disorders.
Causes
Depending upon the type of dysphagia, causes can be categorized into two subsections.[1][2][3][4]
Common Causes of Oropharyngeal Dysphagia
Common causes of oropharyngeal dysphagia | ||
---|---|---|
Neurological | Medication side effects | Others |
|
|
Common causes of Esophageal Dysphagia
The common causes of esophageal dysphagia can be divided into four categories.[5][6][7][8][9]
Structural (Mechanical) disorders | Motor disorders | Esophageal tumors | Systemic diseases | Miscellaneous | ||||
---|---|---|---|---|---|---|---|---|
Intrinsic compression | Extrinsic Compression | Primary | Secondary | |||||
Mucosal rings and webs
|
Strictures: | Vascular compression:
|
|
|
|
|
|
|
Less Common Causes
Less common causes of dysphagia include:
- Scleredema adultorum[10][11]
- Post chemotherapy and radiation therapy[12]
- Descending thoracic aorta aneurysm[13]
- Hypertrophy of cricopharyngeal muscles[14]
Causes by Organ System
The causes of dysphagia based on the organ system are as follows:[15][16]
References
- ↑ Starmer HM, Riley LH, Hillel AT, Akst LM, Best SR, Gourin CG (2014). "Dysphagia, short-term outcomes, and cost of care after anterior cervical disc surgery". Dysphagia. 29 (1): 68–77. doi:10.1007/s00455-013-9482-9. PMID 23943072.
- ↑ Inayat F, Hussain Q, Shafique K (2017). "Dysphagia Caused by Extrinsic Esophageal Compression From Mediastinal Lymphadenopathy in Patients With Sarcoidosis". Clin Gastroenterol Hepatol. 15 (7): e119–e120. doi:10.1016/j.cgh.2016.11.010. PMID 27840183.
- ↑ Oda K, Iwakiri R, Hara M, Watanabe K, Danjo A, Shimoda R; et al. (2005). "Dysphagia associated with gastroesophageal reflux disease is improved by proton pump inhibitor". Dig Dis Sci. 50 (10): 1921–6. doi:10.1007/s10620-005-2962-5. PMID 16187198.
- ↑ Roman S, Kahrilas PJ (2014). "The diagnosis and management of hiatus hernia". BMJ. 349: g6154. doi:10.1136/bmj.g6154. PMID 25341679.
- ↑ Xiao Y, Kahrilas PJ, Nicodème F, Lin Z, Roman S, Pandolfino JE (2014). "Lack of correlation between HRM metrics and symptoms during the manometric protocol". Am J Gastroenterol. 109 (4): 521–6. doi:10.1038/ajg.2014.13. PMC 4120962. PMID 24513804.
- ↑ Enestvedt BK, Williams JL, Sonnenberg A (2011). "Epidemiology and practice patterns of achalasia in a large multi-centre database". Aliment Pharmacol Ther. 33 (11): 1209–14. doi:10.1111/j.1365-2036.2011.04655.x. PMC 3857989. PMID 21480936.
- ↑ Howard PJ, Maher L, Pryde A, Cameron EW, Heading RC (1992). "Five year prospective study of the incidence, clinical features, and diagnosis of achalasia in Edinburgh". Gut. 33 (8): 1011–5. PMC 1379432. PMID 1398223.
- ↑ Pandolfino JE, Gawron AJ (2015). "Achalasia: a systematic review". JAMA. 313 (18): 1841–52. doi:10.1001/jama.2015.2996. PMID 25965233.
- ↑ Gockel I, Lord RV, Bremner CG, Crookes PF, Hamrah P, DeMeester TR (2003). "The hypertensive lower esophageal sphincter: a motility disorder with manometric features of outflow obstruction". J Gastrointest Surg. 7 (5): 692–700. PMID 12850684.
- ↑ Chatterjee S, Hedman BJ, Kirby DF (2017). "An Unusual Cause of Dysphagia". J Clin Rheumatol. doi:10.1097/RHU.0000000000000666. PMID 29280826.
- ↑ Wright RA, Bernie H (1982). "Scleredema adultorum of Buschke with upper esophageal involvement". Am J Gastroenterol. 77 (1): 9–11. PMID 7064968.
- ↑ Nguyen NP, Sallah S, Karlsson U, Antoine JE (2002). "Combined chemotherapy and radiation therapy for head and neck malignancies: quality of life issues". Cancer. 94 (4): 1131–41. PMID 11920484.
- ↑ Conte, Blagio A. (1966). "Dysphagia Caused by an Aneurysm of the Descending Thoracic Aorta". New England Journal of Medicine. 274 (17): 956–957. doi:10.1056/NEJM196604282741710. ISSN 0028-4793.
- ↑ Benedict, Edward B.; Sweet, Richard H. (1955). "Dysphagia Due to Hypertrophy of the Cricopharyngeus Muscle or Hypopharyngeal Bar". New England Journal of Medicine. 253 (26): 1161–1162. doi:10.1056/NEJM195512292532607. ISSN 0028-4793.
- ↑ Sailer, Christian, Wasner, Susanne. Differential Diagnosis Pocket. Hermosa Beach, CA: Borm Bruckmeir Publishing LLC, 2002:77 ISBN 1591032016
- ↑ Kahan, Scott, Smith, Ellen G. In A Page: Signs and Symptoms. Malden, Massachusetts: Blackwell Publishing, 2004:68 ISBN 140510368X