raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:178307

Reticulate acropigmentation of Kitamura

Synonyms: RAK

Type
Disease
Group
Disorder
Inheritance
Autosomal dominant
Age of onset
Adolescent, Adult, Childhood
Status
active

A rare, genetic, hyperpigmentation of the skin disease characterized by childhood to adulthood-onset of reticulate, slightly depressed, sharply demarcated, brown, macular skin lesions without hypopigmentation, affecting the dorsa of the hands and feet, and, occasionally, progressing to involve limbs, neck, forehead and/or trunk. Interrupted dermatoglyphics and palmoplantar pits may be additionally observed. Histologically, hyperpigmented lesions show slightly elongated and thinned rete ridges, mild hyperkeratosis without parakeratosis and absence of incontinentia pigmenti.

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enReticulate acropigmentation of KitamuraRAK
frAcropigmentation réticulée de Kitamura
deRetikuläre Hyperpigmentierung vom Typ Kitamura= en
esAcropigmentación reticulada de Kitamura= en
itAcropigmentazione reticolata di Kitamura
nlReticulaire acropigmentatie van Kitamura= en
ptAcropigmentação reticulada de Kitamura
plSiateczkowata akropigmentacja KitamuraRAPK
csAcropigmentatio reticularis KitamuraRAPK
ukРетикулярна акропігментація Кітамури= en
zh北村网状肢端色素沉着症= en
trKitamura'nın ağsı akropigmentasyonu= en

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
OMIM615537Evalidated
ICD-10L81.8NTBTattributedvalidated
ICD-11EC23.YNTBTattributedvalidated
MONDO0014234Evalidated
UMLSC0406811Evalidated

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 (2):

No children.

4

Genes

1 direct
GeneAssociationStatusHGNCEnsemblOMIMLocusNameSource of validation
ADAM10Disease-causing germline mutation(s) (loss of function) inAssessedHGNC:188ENSG0000013784560219215q21.3ADAM metallopeptidase domain 1023666529[PMID]
5

Prevalence and incidence

2 records
TypeClassValueAreaQualificationValidationSource
Cases/families130 casesWorldwideCase(s)Validated23666529[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

Orphanet has no HPO annotation for this code in this release.

7

Sources for this card