raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:79492

Pili gemini

Synonyms: Pili multigemini

Type
Disease
Group
Disorder
Age of onset
Adolescent, Adult, Childhood, Elderly
Status
active

A rare isolated hair shaft abnormality characterized by multiple hair shafts arise from a single pilosebaceous canal and emerge from a single follicular ostium. It can occur in each type of hair; mostly in bread of men or in the other uncommon locations of the body (such as the back or abdomen). Folliculitis may also be present. Most of the patients are asymptomatic, however, some may present with recurrent inflammatory lesions which can have residual atrophic or hypertrophic scars. Persisting itching is also reported in some patients.

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enPili geminiPili multigemini
frPili gemini= en
dePili gemini= en
esPili gemini= en
itPili gemini= en
nlPili gemini= en
ptPili multigemini
plWłosy bliźniacze= en
csPili gemini= en
ukМультипліковані волосини (Pili gemini)= en
zh双菌毛双菌毛
trPili gemini= en

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
ICD-10L67.8NTBTattributedvalidated
ICD-11ED73.YNTBTindexvalidated
MONDO0019330Evalidated
MeSHC537188Evalidated
UMLSC0019571Evalidated

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):

No children.

4

Genes

0 direct

Orphanet records no gene directly on this code.

5

Prevalence and incidence

1 record
TypeClassValueAreaQualificationValidationSource
Point prevalenceUnknown—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

2 annotations · validated 2019-06-17
HPOTerm (as annotated by Orphanet)Diagnostic
Obligate (100%)
HP:0003329Hair shafts flattened at irregular intervals and twisted through 180 degrees about their axes
Frequent (79-30%)
HP:0003328Abnormal hairshaft morphology

Run the differential on the 1 obligate / very frequent terms

Annotation source: 10882940[PMID]

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Sources for this card