Double fingernails on the small fingers.

Area of Science:

• Developmental biology
• Clinical genetics
• Congenital anomalies

Background:

• Congenital anomalies of the hand and digits are diverse, encompassing variations in structure and formation.
• Understanding the etiology of rare digital malformations is crucial for genetic counseling and clinical management.
• Previous literature has documented similar anomalies, sometimes associated with chromosomal abnormalities.

Observation:

• This report presents a unique case of bilateral dorsal skin and fingernail presence on the palmar aspect of the small fingers.
• A normal fingernail was observed on the dorsal surface of the same digits.
• The affected child exhibited a normal karyotype, indicating the anomaly is not due to major chromosomal aberrations.

Findings:

• The primary finding is a rare presentation of ectrodactyly or related digital malformation involving both palmar and dorsal surfaces of the small fingers.
• The presence of skin and nail tissue in an atypical location (palmar surface) is a key characteristic of this anomaly.
• The normal karyotype in this case suggests that the etiology may be distinct from previously reported cases linked to chromosomal abnormalities, such as chromosome 6.

Implications:

• This case expands the spectrum of known digital anomalies and highlights the variability in their presentation.
• Further research into the genetic and developmental pathways underlying such anomalies is warranted.
• Accurate diagnosis and understanding of the underlying mechanisms are essential for providing appropriate clinical care and genetic counseling to affected families.