Related Experiment Videos
Familial posterior labial fusion.
V R Klein1, S P Willman, B R Carr
1Department of Obstetrics and Gynecology, University of Texas Southwestern Medical Center, Dallas.
Obstetrics and Gynecology
|March 1, 1989
Summary
This study presents a rare case of posterior labial fusion in a 12-year-old girl without androgen excess. Family history suggests a possible autosomal dominant genetic trait with incomplete penetrance.
Area of Science:
- Genetics
- Endocrinology
- Pediatric Surgery
Background:
- Partial virilization in genotypic females, including labial fusion and clitoromegaly, is typically caused by congenital adrenal hyperplasia (CAH) due to excess androgen production.
- Less common causes include maternal androgen exposure or androgen-secreting tumors during pregnancy.
Observation:
- A 12-year-old girl presented with posterior labial fusion but no clitoromegaly.
- Crucially, there was no evidence of androgen excess in this patient.
- A significant family history revealed similar congenital defects in two maternal aunts and their daughters.
Findings:
- The case suggests a genetic etiology for posterior labial fusion, distinct from typical androgen excess conditions.
- The familial pattern points towards an autosomal dominant inheritance pattern.
- Incomplete penetrance is indicated by the variable expression of the trait within the family.
Implications:
- This case expands the differential diagnosis for isolated posterior labial fusion in genotypic females.
- It highlights the importance of considering genetic factors and family history in cases without clear endocrine abnormalities.
- Further research into the specific genetic mechanisms underlying this familial trait is warranted.