raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:79456

Diffuse cutaneous mastocytosis

Synonyms: DCM · Diffuse cutaneous maculopapulous mastocytosis

Type
Disease
Group
Disorder
Inheritance
Not applicable
Age of onset
Infancy, Neonatal
Status
active

Diffuse cutaneous mastocytosis (DCM) is a rare form of cutaneous mastocytosis (CM) characterized by generalized erythroderma, various degrees of blistering, skin with a ''peau d'orange'' appearance and the accumulation of mast cells in the skin. At least two DCM variants are recognized, one with extreme blistering (Bullous DCM) and one with infiltrations (Pseudoxanthomatous DCM).

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enDiffuse cutaneous mastocytosisDCM · Diffuse cutaneous maculopapulous mastocytosis
frMastocytose cutanée diffuseDCM
deMastozytose, kutane, diffuse FormDiffuse kutane Mastozytose (DCM)
esMastocitosis cutánea difusaDCM · Mastocitosis maculopapular cutánea difusa
itMastocitosi cutanea diffusaDCM · Mastocitosi maculopapulosa cutanea diffusa
nlDiffuse cutane mastocytoseDCM · Diffuse cutane maculopapuleuze mastocytose
ptMastocitose cutânea difusa
plRozlana mastocytoza skórna= en
csDifuzní kožní mastocytózaDCM · Difuzní kožní makulopapulózní mastocytóza
ukДифузний шкірний мастоцитозDCM · Дифузний шкірний макулопапульозний мастоцитоз
zh弥漫皮肤性肥大细胞增多弥漫皮肤斑丘疹性肥大细胞增多
trDiffüz kutanöz mastositozDCM · Yaygın kutanöz makulopapulöz mastositoz

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
ICD-10Q82.2NTBTattributedvalidated
ICD-112A21.1YNTBTindexvalidated
ICD-11XH2RG8Especificvalidated
MONDO0019315Evalidated
UMLSC0024901Evalidated
GARD12686Evalidated
MedDRA10012812Evalidated

E exact · NTBT this ORPHAcode is narrower than the target · BTNT broader than the target · ND not decided.

3

Classification

Preferential parent (Orphanet linearisation):

Parents in the classifications (1):

Children (2):

4

Genes

0 direct · 2 via subtypes

Orphanet records no gene directly on this code.

Recorded by Orphanet on subtypes of this disorder:

GeneSubtypeAssociationStatusHGNCEnsemblOMIMLocusNameSource of validation
KITORPHA:280785Bullous diffuse cutaneous mastocytosisDisease-causing germline mutation(s) inAssessedHGNC:6342ENSG000001574041649204q12KIT proto-oncogene, receptor tyrosine kinase15173254[PMID]
KITORPHA:280794Pseudoxanthomatous diffuse cutaneous mastocytosisDisease-causing germline mutation(s) inAssessedHGNC:6342ENSG000001574041649204q12KIT proto-oncogene, receptor tyrosine kinase15173254[PMID]
5

Prevalence and incidence

2 records
TypeClassValueAreaQualificationValidationSource
Cases/families30 casesWorldwideCase(s)Validated20678092[PMID]
Point prevalence<1 / 1 000 000—WorldwideClass onlyValidatedORPHANET

Value is Orphadata's ValMoy: the mean estimate per 100 000 for prevalence and incidence, the number of cases or families for case reports.

6

HPO phenotypes

31 annotations · validated 2021-11-22
HPOTerm (as annotated by Orphanet)Diagnostic
Very frequent (99-80%)
HP:0025081Darier's sign
HP:0031284Flushing
HP:0011354Generalized abnormality of skin
HP:0031901Increased serum mast cell beta-tryptase concentration
HP:0000989Pruritus
Frequent (79-30%)
HP:0008066Abnormal blistering of the skin
HP:0100845Anaphylactic shock
HP:0002014Diarrhea
HP:0002315Headache
HP:0002615Hypotension
HP:0100827Lymphocytosis
HP:0004395Malnutrition
HP:0025533Peau d'orange
HP:0200041Skin erosion
HP:0001072Thickened skin
HP:0001025Urticaria
HP:0002013Vomiting
Occasional (29-5%)
HP:0002027Abdominal pain
HP:0001392Abnormality of the liver
HP:0011971Dermatographic urticaria
HP:0001019Erythroderma
HP:0001945Fever
HP:0002239Gastrointestinal hemorrhage
HP:0002240Hepatomegaly
HP:0009123Mixed hypo- and hyperpigmentation of the skin
HP:0040189Scaling skin
HP:0030828Wheezing
Very rare (<4-1%)
HP:0005561Abnormality of bone marrow cell morphology
HP:0001743Abnormality of the spleen
HP:0002716Lymphadenopathy
HP:0005547Myeloproliferative disorder

Run the differential on the 5 obligate / very frequent terms

Annotation source: 22092511[PMID]_30187958[PMID]

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Sources for this card