Fibular Agenesis and Ball-Like Toes Mimicking Preaxial Polydactyly: Prenatal Presentation of Du Pan Syndrome

Molecular syndromology

article

Turgut, G. Tutku¹  Kalelioglu, Ibrahim Halil²  Karaman, Volkan¹  Sarac Sivrikoz, Tugba²  Karaman, Birsen¹  Uyguner, Zehra Oya¹  Kalayci, Tugba¹ 

[1] Department of Medical Genetics, Istanbul Faculty of Medicine, Istanbul University;Division of Perinatology, Department of Obstetrics and Gynecology, Istanbul Faculty of Medicine, Istanbul University

关键词: Du Pan syndrome;    GDF5;    Prenatal diagnosis;    Acromesomelic dysplasia;    Brachydactyly;   

DOI  :  10.1159/000527955

学科分类：基础医学

来源: S Karger AG

【 摘 要 】

Introduction: GDF5-BMPR1B signaling pathway-associated chondrodysplasias are a genetically heterogeneous group of conditions with significant phenotypic and genotypic overlap, consisting of Hunter-Thompson-type acromesomelic dysplasia, Grebe dysplasia, and Du Pan syndrome. Constituting a spectrum of clinical severity, these disorders are characterized by disproportionate short stature mainly involving middle and distal segments of the extremities. Du Pan syndrome represents the mildest end of this spectrum with less marked shortened limbs, fibular agenesis or hypoplasia, absence of frequent joint dislocations, and carpotarsal fusions with deformed phalangeal bones. Case Presentation: Here, we report the first prenatal diagnosis of Du Pan syndrome based on the sonographic findings of bilateral fibular agenesis and ball-shaped toes mimicking preaxial polydactyly accompanying subtle brachydactyly in the family. GDF5C, p.(Leu441Pro) in the fetus and confirmed the carrier status in the mother. Discussion: We suggest that the presence of bilateral fibular agenesis and the apparent image of preaxial polydactyly of the feet on prenatal ultrasound should alert suspicion to Du Pan syndrome, with the latter possibly being a sonographic pitfall. Alongside the fetal imaging, a detailed clinical examination of the expectant parents is also of great importance in establishing a preliminary diagnosis of Du Pan syndrome, as well as the other GDF5-BMPR1B-associated chondrodysplasias.

【 授权许可】

CC BY