Erythema gyratum repens: Difference between revisions

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| style="padding: 5px 5px; background: #DCDCDC;" | '''[[Necrolytic migratory erythema|Necrolytic migratory erythema (NME)]]'''
| style="padding: 5px 5px; background: #DCDCDC;" | '''[[Necrolytic migratory erythema|Necrolytic migratory erythema (NME)]]'''
| style="padding: 5px 5px; background: #F5F5F5;" |
| style="padding: 5px 5px; background: #F5F5F5;" |
* Migratory circinate erythema/plaques with areas of necrosis and sloughing  
* Migratory circinate [[erythema]]/[[plaques]] with areas of [[necrosis]] and [[sloughing]]


* Crusted  Erythematous scaly plaques with centrifugal growth
*[[Crusted]]  [[Erythematous]] scaly plaques with centrifugal growth


*
*
| style="padding: 5px 5px; background: #F5F5F5;" |
| style="padding: 5px 5px; background: #F5F5F5;" |
* Red erythematous scaly plaques over Perineum, distal extremities, lower abdomen, and face
* Red [[erythematous]] scaly [[plaques]] over [[Perineum]], distal [[extremities]], lower [[abdomen]], and [[face]]
* Spontaneous exacerbation and remission periods without knowing what the trigger is
* Spontaneous exacerbation and [[remission]] periods without knowing what the trigger is
* Weight loss
*[[Weight loss]]
* Anemia
*[[Anemia]]
* Diabetes
*[[Diabetes]]
* Diarrhea
*[[Diarrhea]]
* Stomatitis.
*[[Stomatitis]].
| style="padding: 5px 5px; background: #F5F5F5;" |
| style="padding: 5px 5px; background: #F5F5F5;" |
* No other association
* Obligatory [[paraneoplastic]] [[syndrome]]
*First manifestation of the rare [[pancreatic neuroendocrine tumor]] ([[Glucagonoma|glaucagonoma]])
*No other association
* Can be misdiagnosed as:
* Can be misdiagnosed as:
** Contact dermatitis
**[[Contact dermatitis]]
** Intertrigo
**[[Intertrigo]]
** Inverse psoriasis
**[[Psoriasis|Inverse psoriasis]]
** Zinc deficiency
**[[Zinc deficiency]]
** Other nutritional deficiencies
** Other [[nutritional deficiencies]]
| style="padding: 5px 5px; background: #F5F5F5;" |
| style="padding: 5px 5px; background: #F5F5F5;" |
* Paleness and spongiosis of the upper layer of the epidermis
*[[Paleness]] and spongiosis of the upper layer of the [[epidermis]]


* A perivascular lymphocytic and histiocytic infiltrate
* A [[Perivascular cell|perivascular]] [[lymphocytic]] and [[histiocytic]] infiltrate


* Necrotic keratinocytes are common and can lead to erosions, crusting and scaling
*[[Necrotic]] [[Keratinocyte|keratinocytes]] are common and can lead to erosions, crusting and [[Scaling skin|scaling]]
| style="padding: 5px 5px; background: #F5F5F5;" |
| style="padding: 5px 5px; background: #F5F5F5;" |
* Increased glucagon level  
* Increased [[glucagon]] level


* Evaluation of the associated tumor:
* Evaluation of the associated [[tumor]]:
** CT or MRI abdomen
**[[CT-scans|CT]] or [[MRI]] [[abdomen]]


* * Selective visceral angiography to localize the tumor
* * [[Visceral angiography|Selective visceral angiography]] to localize the tumor


* * Positron Emission tomography (PET)
* * [[Positron Emission Tomography]] (PET)


* * Octreotide scintigraphy
* * [[Octreotide]] [[scintigraphy]]
| style="padding: 5px 5px; background: #F5F5F5;" |
| style="padding: 5px 5px; background: #F5F5F5;" |
* Due to the difficulty of NME recognition, and its association with glucagonoma, diagnosis is usually delayed
* Due to the difficulty of necrolytic migratory erythema recognition, and its association with [[glucagonoma]], diagnosis is usually delayed


* NME usually resolved after the resection and treatment of the pancreatic tumor, eg.10 days after tumor resection
* Necrolytic migratory erythema usually resolved after the resection and treatment of the [[Pancreatic tumor|pancreatic tumor,]] eg.10 days after tumor resection


* Early recognition is crucial for better diagnosis and prognosis <br />
* Early recognition is crucial for better diagnosis and prognosis <br />
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==Epidemiology and Demographics ==
==Epidemiology and Demographics ==
* Erythema gyratum repens is a rare, characteristic, and paraneoplastic syndrome with the following demographics:<ref name="pmid22224159" />
* Erythema gyratum repens is a rare, characteristic, and [[paraneoplastic syndrome]] with the following demographics:<ref name="pmid22224159" />


'''Age'''
'''Age'''
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==Risk Factors==
==Risk Factors==
* There are no established risk factors for erythyma gyratum repens.
* There are no established risk factors for erythyma gyratum repens.
*Many patients with erythyma gyratum repens and malignancy had a history of tobacco smoking.
*Many patients with erythyma gyratum repens and malignancy had a history of [[tobacco smoking]].
*Some patients with erythyma gyratum repens and malignancy have a family history of neoplasm.
*Some patients with erythyma gyratum repens and [[malignancy]] have a family history of [[neoplasm]].


==Screening==
==Screening==
* There are no screening tests for EGR.
* There are no screening tests for erythema gyratum repens.
* Screening for internal malignancy should be done immediately after EGR is diagnosed.  
* Screening for internal [[malignancy]] should be done immediately after erythema gyratum repens is diagnosed.


==Natural History, Complications, and Prognosis==
==Natural History, Complications, and Prognosis==
* The majority of patients with EGR presents with severely pruritic erythematous skin lesions that appear several months prior to the malignancy diagnosis<ref name="pmid22224159" />
* The majority of patients with erythema gyratum repens presents with severely [[Pruritic disorders|pruritic]] [[erythematous]] skin lesions that appear several months prior to the [[malignancy]] diagnosis<ref name="pmid22224159" />
* If the underlying malignancy left untreated, the debilitating pruritus could persist until the patient dies<ref name="pmid22224159" />
* If the underlying [[malignancy]] left untreated, the debilitating [[pruritus]] could persist until the patient dies<ref name="pmid22224159" />
*Prognosis depends on the type of the underlying tumor and the probability of its treatment. It depends on the time of the EGR onset and the neoplasm discovery. The course and prognosis of EGR can be one of the following:   
*Prognosis depends on the type of the underlying tumor and the probability of its treatment. It depends on the time of the erythema gyratum repens onset and the neoplasm discovery. The course and prognosis of erythema gyratum repens can be one of the following:   
** Complete cure of the skin eruption and pruritus after removal and treatment of the internal neoplasm.
** Complete cure of the skin [[eruption]] and [[pruritus]] after removal and treatment of the internal [[neoplasm]].
** Temporary improvement then recurrence of the eruption (specially in cases of metastasis).
** Temporary improvement then recurrence of the [[eruption]] (specially in cases of [[metastasis]]).
** No effect of the tumor treatment on the course of EGR.
** No effect of the tumor treatment on the course of erythema gyratum repens.
** Death can occur few weeks after the discovery of the malignancy, few months, or four years as in Gammel's patient.
** Death can occur few weeks after the discovery of the malignancy, few months, or four years as in Gammel's patient.


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===Diagnostic Study of Choice===
===Diagnostic Study of Choice===
* Erythyma gyratum repens is mainly diagnosed clinically by its characteristic skin lesions.
* Erythyma gyratum repens is mainly diagnosed clinically by its characteristic skin lesions.
* It is considered as a cutaneous marker of malignancy with high specificity so physicians shouldn't miss its unique clinical skin presentation.
* It is considered as a cutaneous marker of [[malignancy]] with high specificity so physicians shouldn't miss its unique [[clinical]] skin presentation.


===History and Symptoms===
===History and Symptoms===
* The universal symptoms of erythema gyratum repens are:
* The universal symptoms of erythema gyratum repens are:
** Skin [[eruptions]]
**[[Eruption|Skin eruptions]]
** Intense pruritus  
**[[Pruritus|Intense pruritus]]
* Other symptoms related to the associated internal [[malignancy]] may include:
* Other symptoms related to the associated internal [[malignancy]] may include:
** [[Weight loss]]
** [[Weight loss]]
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* There are no diagnostic laboratory findings associated with erythema gyratum repens.
* There are no diagnostic laboratory findings associated with erythema gyratum repens.
* [[Eosinophilia]] is observed in 60% of cases.<ref name="pmid22224159" />
* [[Eosinophilia]] is observed in 60% of cases.<ref name="pmid22224159" />
*[[Decreased]] [[T lymphocytes]] and [[increased]] [[B lymphocytes]] observed in an erythema gyratum repens patient with increased luteinizing hormone and follicle-stimulating hormone.<ref name="pmid8339188" />
*[[Decreased]] [[T lymphocytes]] and [[increased]] [[B lymphocytes]] observed in an erythema gyratum repens patient with increased [[luteinizing hormone]] and [[follicle-stimulating hormone]].<ref name="pmid8339188" />
*[[Decreased]] serum levels of [[C3]].<ref name="pmid8339188" />
*[[Decreased]] serum levels of [[C3 (complement)|C3]].<ref name="pmid8339188" />
*Normal percentages of [[B and T lymphocytes]] and normal [[T-cell function]] were reported in an erythema gyratum repens patient without cancer.<ref name="pmid8339188" />
*Normal percentages of [[B lymphocyte|B]] and [[T lymphocytes]] and normal [[T-cell|T-cell function]] were reported in an erythema gyratum repens patient without [[cancer]].<ref name="pmid8339188" />


=== Imaging Findings===
=== Imaging Findings===
* There are no imaging findings associated with erythyma gyratum repens.
* There are no imaging findings associated with erythyma gyratum repens.
* Imaging to look for systemic neoplasms are:<ref name="pmid22224159" />
* Imaging to look for systemic [[neoplasms]] are:<ref name="pmid22224159" />
*<nowiki>* Computed tomography of the head, neck, chest, abdomen, and pelvis.</nowiki>
*<nowiki>* </nowiki>[[Computed tomography]] of the head, neck, chest, abdomen, and pelvis.
** Positron emission tomography/computed tomography
**[[Positron emission tomography]]/[[computed tomography]]
** Upper and lower gastrointestinal endoscopy
** Upper and lower [[gastrointestinal]] [[endoscopy]]
*The abnormal findings that heightened concern for systemic or widespread malignancy are:  
*The abnormal findings that heightened concern for systemic or widespread [[malignancy]] are:  
** Brain, chest, lung, abdominal, peritoneal, or pelvic mass.
**[[Brain]], [[chest]], [[lung]], [[abdominal]], [[peritoneal]], or [[Pelvic masses|pelvic mass.]]
** Lymphadenopathy.
**[[Lymphadenopathy]].
** Enhanced bone lucencies suggestive of diffuse metastasis.
** Enhanced bone lucencies suggestive of diffuse [[metastasis]].


===Other Diagnostic Studies===
===Other Diagnostic Studies===
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** [[Chemotherapy]]  
** [[Chemotherapy]]  
** [[Conservative]] [[palliative]] management  
** [[Conservative]] [[palliative]] management  
*Various dermatologic and immunosuppressive therapies have been used to treat EGR.
*Various dermatologic and immunosuppressive therapies have been used to treat erythema gyratum repens.
*Systemic steroids are frequently ineffective.
*Systemic [[steroids]] are frequently ineffective.
* Topical steroids, vitamin A, and azathioprine have also failed to relieve skin manifestations
* Topical [[steroids]], [[vitamin A]], and [[azathioprine]] have also failed to relieve skin manifestations


===Surgery ===
===Surgery ===
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** There are no primary preventive measures available for erythema gyratum repens
** There are no primary preventive measures available for erythema gyratum repens
* [[Secondary]] [[Prevention]]:
* [[Secondary]] [[Prevention]]:
** If the thorough screening after Erythyma gyratum repens diagnosis detected the malignancy in its earliest stages.
** If the thorough screening after Erythyma gyratum repens diagnosis detected the [[malignancy]] in its earliest stages.
* [[Tertiary]] [[prevention]]:
* [[Tertiary]] [[prevention]]:
** If the thorough screening after Erythyma gyratum repens diagnosis detected the malignancy in its late stages or with widespread [[metastasis]].
** If the thorough screening after Erythyma gyratum repens diagnosis detected the malignancy in its late stages or with widespread [[metastasis]].

Revision as of 20:42, 1 July 2019

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Synonyms and keywords: Gammel's disease.


Overview

Erythema gyratum repens is a rare highly specific and characteristic paraneoplastic syndrome that usually affect older people. It is characterized by wood-grain scaly skin eruption with intense pruritus. The cause of erythema gyratum repens is unknown but many theories suggest immunologic etiology or toxicologic products that are released by the associated tumor. The first case of erythema gyratum repens was described by a dermatologist named Gammel in the year 1952. For many years after erythema gyratum repens original description, there was little progress in defining the pathogenesis of erythema gyratum repens. Erythema gyratum repens has no specific classification but we can classify it based on its association with an internal malignancy into para-neoplastic and non-para-neoplastic erythema gyratum repens. The most common malignancies associated with erythema gyratum repens are lung or bronchogenic cancer, esophageal cancer, and breast cancer. Erythema gyratum repens can also be associated with non-neoplastic diseases as tuberculosis, autoimmune disorders, or CREST syndrome. Erythema gyratum repens is characterized by its pathogonomic figurate, gyrate, or annular erythematous skin eruptions. The intense pruritus can be debilitating and usually urges the patient to go to the emergency department. The microscopic histopathological features of erythema gyratum repens consist of acanthosis, focal parakeratotic, and spongiosis of the epidermis with perivascular mononuclear, lymphocytic, and histiocytic infiltrate in the superficial plexus of the dermis. Erythema gyratum repens is very rare and it mainly affects people in their seventieth decade, the male to female ratio is 2:1. Erythema gyratum repens is diagnosed clinically by its characteristic skin eruption and an urgent thorough paraneoplastic workup should be initiated to look for internal malignancies. Patients with erythema gyratum repens presents with intensely pruritic, gradually progressive, skin lesions that crawl rather than migrate from one body region to the other. It can start in the upper trunk or upper back and extends to involve the extremities sparing the face. The mainstay of the treatment of erythema gyratum repens is finding and treating the underlying malignancy. Symptomatic treatment is not very effective in relieving the pruritus and its associated pain. The management can be surgical removal of the tumor, chemotherapy, or palliative conservative management. The skin eruptions can improve completely after the removal of the underlying tumor, or can recur especially if the tumor recurred or metastasized. Patients can live a few weeks, months or up to five years depending on when and at what stage the malignancy was detected.

Historical Perspective

  • The association between cutaneous manifestations and systemic malignancies was first studied in 1925 by Rothman, the Hungarian investigative dermatologist, who wrote a comprehensive review on this subject and since then, cases were added to proof for the relationship between internal neoplasm and some skin lesions.[1][2]
  • Erythema gyratum repens was first described by Dr. John A Gammel, the dermatologist, who was trained to link bizarre or recalcitrant dermatoses to internal malignancy, In 1952, in a 55-year-old patient who had been complaining of pruritic scaly skin eruption and diagnosed nine months later with poorly differentiated adenocarcinoma of the breast with metastasis to axillary lymph nodes.[3][4]
  • In 1950, Dr. Gammel presented his case of Erythema gyratum repens before the Cleveland Dermatological Society as Erythema gyratum migrans then he changed the term to erythema gyratum repens because the eruption does not "migrate" from one place to another but "crawls" constantly in the areas involved, like "ants on an anthill".[3]
  • In 1973, 45 year old man was diagnosed with erythema gyratum repens associated with metastatic, undifferentiated adenocarcinoma which was removed following a right- sided craniotomy. The patient was misdiagnosed with erythema perstans and the malignancy was discovered after 8 months of the skin manifestations.[5]
  • Up to 1992, there were only 49 cases in the literature, 41 of which (84%) were associated with a neoplasm and that is why erythema gyratum repens has been considered as a paraneoplastic syndrome.[6]
  • Between 1990 and 2010, a literature review was done by collecting data from the medical records of patients form dermatology department in University of Genoa and from databases as pubmed and medline, to conclude that erythema gyratum repens is no longer considered as an obligate paraneoplastic syndrome. More than expected cases of EGR were found with no neoplasm association.[7]

Classification

Types of Erythema gyratum repens Characterestics
Paraneoplastic EGR
Non-paraneoplastic EGR
  • Idiopathic erythema gyratum repens
  • Erythema gyratum repens-like eruptions
  • Erythema gyratum repens with concomitant disease
  • Drug-induced erythema gyratum repens
Idiopathic EGR
  • Erythema gyratum repens with no underlying malignancy, associated conditions, or precipitating cause
EGR-like eruptions
EGR with concomittant skin disease
Drug-induced EGR

Pathophysiology


Causes

  • The exact cause of erythema gyratum repens is unknown.
  • Various immunologic mechanisms suggest that erythema gyratum repens etiology is stemmed from an immunologic reaction.
  • The association between erythema gyratum repens and systemic malignancy is evidenced by the disappearance of the pruritic eruptions after the treatment of the underlying neoplasm.
  • The association doesn't necessarily mean causation.

Differentiating Erythema Gyratum Repens from Other Diseases

Disease Erythema Characteristics Signs and Symptoms Associated Conditions Histopathology Lab finding

& Other evaluation

prognosis
Erythema gyratum repens (EGR)
  • Migratory annular and configurate erythematous bands that form concentric rings
  • Wood grain scaly appearance
  • scales follows the leading edge of the bands
  • Eruption migrates more rapidly, 1cm/d

(Calcinosis, Raynaud’s phenomenon, Esophageal dysmotility, Sclerodactyly, and Telangiectasia)


  • Skin manifestations can be improved within 48 hours of the resection of the underlying tumor with on of the following:
    • Complete cure of the skin eruption and pruritus
    • Temporary improvement then recurrence of the eruption (specially in cases of metastasis)
    • No effect of the tumor treatment on the course of EGR
      • Death can occur few weeks after the detection of the malignancy, few months, or four years as in Gammel's patient.
Erythema annulare centrifugum (EAC) [14]
  • Migratory annular and configurate erythematous

or polycyclic lesions

  • Eruption migrate at a slower rate (2 -3 mm/d) reaching up to 10 cm in diameter with central clearing
  • Cover only a small percentage of the total body surface   
  • Annular or polycyclic lesions which may begin as urticaria-like papule
  • Eventually old lesions can spontaneously resolve in several days to a few weeks while new eruptions develop.
  • The deep form of erythema annulare centrifugum has a firm, indurated border, is rarely pruritic, and has no scale
  • The superficial type of erythema annulare centrifugum has an indistinct scaly border and is usually pruritic  
  • No specific laboratory changes
  • Lesions disappear after the underlying etiology is managed (allergy, infection, malignancy)
  • if no underlying cause, lesions can recur after discontinuation of the supportive treatment
Necrolytic migratory erythema (NME)
  • Due to the difficulty of necrolytic migratory erythema recognition, and its association with glucagonoma, diagnosis is usually delayed
  • Necrolytic migratory erythema usually resolved after the resection and treatment of the pancreatic tumor, eg.10 days after tumor resection
  • Early recognition is crucial for better diagnosis and prognosis

Epidemiology and Demographics

Age

  • The average age of onset of erythema gyratum repens i is in the seventh decade of life (65 years old).

Gender

  • The male to female ratio is 2:1.

Race

  • EGR commonly affects Caucasians.

Risk Factors

  • There are no established risk factors for erythyma gyratum repens.
  • Many patients with erythyma gyratum repens and malignancy had a history of tobacco smoking.
  • Some patients with erythyma gyratum repens and malignancy have a family history of neoplasm.

Screening

  • There are no screening tests for erythema gyratum repens.
  • Screening for internal malignancy should be done immediately after erythema gyratum repens is diagnosed.

Natural History, Complications, and Prognosis

  • The majority of patients with erythema gyratum repens presents with severely pruritic erythematous skin lesions that appear several months prior to the malignancy diagnosis[13]
  • If the underlying malignancy left untreated, the debilitating pruritus could persist until the patient dies[13]
  • Prognosis depends on the type of the underlying tumor and the probability of its treatment. It depends on the time of the erythema gyratum repens onset and the neoplasm discovery. The course and prognosis of erythema gyratum repens can be one of the following:
    • Complete cure of the skin eruption and pruritus after removal and treatment of the internal neoplasm.
    • Temporary improvement then recurrence of the eruption (specially in cases of metastasis).
    • No effect of the tumor treatment on the course of erythema gyratum repens.
    • Death can occur few weeks after the discovery of the malignancy, few months, or four years as in Gammel's patient.

Diagnosis

Diagnostic Study of Choice

  • Erythyma gyratum repens is mainly diagnosed clinically by its characteristic skin lesions.
  • It is considered as a cutaneous marker of malignancy with high specificity so physicians shouldn't miss its unique clinical skin presentation.

History and Symptoms

Physical Examination

Laboratory Findings

Imaging Findings

Other Diagnostic Studies

Treatment

Medical Therapy

Surgery

  • Surgical resection of the discovered malignancy could be recommended as part of the management of Erythyma gyratum repens.

Prevention

References

  1. Rothman, Stephan (1925). "Über Hauterscheinungen bei bösartigen Geschwülsten innerer Organe". Archiv für Dermatologie und Syphilis. 149 (1): 99–123. doi:10.1007/BF02297811. ISSN 0340-3696.
  2. Burgdorf WHC, Bickers DR (2015). "The scientific legacy of Stephen Rothman". J Invest Dermatol. 135 (4): 954–959. doi:10.1038/jid.2014.447. PMC 4366295. PMID 25373439.
  3. 3.0 3.1 3.2 Gammel, John A. (1952). "ERYTHEMA GYRATUM REPENS". A.M.A. Archives of Dermatology and Syphilology. 66 (4): 494. doi:10.1001/archderm.1952.01530290070010. ISSN 0096-5979.
  4. Purdy, M. J. (1959). "Erythema Gyratum Repens". A.M.A. Archives of Dermatology. 80 (5): 590. doi:10.1001/archderm.1959.01560230076020. ISSN 0096-5359.
  5. 5.0 5.1 Skolnick, Marvin (1975). "Erythema Gyratum Repens With Metastatic Adenocarcinoma". Archives of Dermatology. 111 (2): 227. doi:10.1001/archderm.1975.01630140085011. ISSN 0003-987X.
  6. Boyd AS, Neldner KH, Menter A (1992). "Erythema gyratum repens: a paraneoplastic eruption". J Am Acad Dermatol. 26 (5 Pt 1): 757–62. PMID 1583177.
  7. 7.0 7.1 7.2 Rongioletti, F.; Fausti, V.; Parodi, A. (2014). "Erythema gyratum repens is not an obligate paraneoplastic disease: a systematic review of the literature and personal experience". Journal of the European Academy of Dermatology and Venereology. 28 (1): 112–115. doi:10.1111/j.1468-3083.2012.04663.x. ISSN 0926-9959.
  8. 8.0 8.1 Fukunaga M, Harada K, Mae K, Wakamatsu K, Kiriyama N, Tsuboi R; et al. (2017). "Erythema Gyratum Repens-Like Purpura in a Patient with Sjögren Syndrome". Case Rep Dermatol. 9 (2): 40–43. doi:10.1159/000477375. PMC 5498950. PMID 28690517.
  9. 9.0 9.1 Günther R, Nasser S, Hinrichsen H, Fölsch UR (2002). "[Erythema gyratum repens: drug reaction following azathioprine administration in a patient with type I [[autoimmune]] [[hepatitis]]". Med Klin (Munich). 97 (7): 414–7. PMID 12168480. URL–wikilink conflict (help)
  10. 10.0 10.1 Rongioletti, Franco; Fausti, Valentina; Parodi, Aurora (2012). "Erythema Gyratum Repens Induced by Pegylated Interferon Alfa for Chronic Hepatitis C". Archives of Dermatology. 148 (10): 1213. doi:10.1001/archdermatol.2012.1968. ISSN 0003-987X.
  11. Samotij D, Szczech J, Bencal-Kusinska M, Reich A (2016). "Erythema gyratum repens associated with cryptogenic organizing pneumonia". Indian J Dermatol Venereol Leprol. 82 (2): 212–3. doi:10.4103/0378-6323.173594. PMID 26765132.
  12. Appell ML, Ward WQ, Tyring SK (1988). "Erythema gyratum repens. A cutaneous marker of malignancy". Cancer. 62 (3): 548–50. doi:10.1002/1097-0142(19880801)62:3<548::aid-cncr2820620318>3.0.co;2-h. PMID 3390794.
  13. 13.00 13.01 13.02 13.03 13.04 13.05 13.06 13.07 13.08 13.09 13.10 13.11 Gore M, Winters ME (2011). "Erythema gyratum repens: a rare paraneoplastic rash". West J Emerg Med. 12 (4): 556–8. doi:10.5811/westjem.2010.11.2090. PMC 3236141. PMID 22224159.
  14. 14.0 14.1 14.2 14.3 14.4 14.5 14.6 14.7 14.8 14.9 Tyring SK (1993). "Reactive erythemas: erythema annulare centrifugum and erythema gyratum repens". Clin Dermatol. 11 (1): 135–9. PMID 8339188.
  15. 15.0 15.1 Holt PJ, Davies MG (1977). "Erythema gyratum repens--an immunologically mediated dermatosis?". Br J Dermatol. 96 (4): 343–7. PMID 861171.
  16. Ridge A, Tummon O, Laing M (2019). "Response to "Transformation from pityriasis rubra pilaris to erythema gyratum repens-like eruption without associated malignancy: A report of 2 cases"". JAAD Case Rep. 5 (5): 461–462. doi:10.1016/j.jdcr.2019.03.012. PMC 6510971 Check |pmc= value (help). PMID 31111084.