An unusual presentation of postaxial polydactyly of the foot

Area of Science:

• Medical genetics
• Pediatric orthopedics
• Congenital anomalies

Background:

• Postaxial polydactyly is a common congenital limb malformation.
• The 'floating type' (FT) of polydactyly is exceptionally rare.
• Congenital foot deformities can impact mobility and require early intervention.

Observation:

• A 6-month-old infant presented with postaxial polydactyly of the left foot.
• Radiographic analysis revealed the accessory digit was primarily soft tissue with a small osseous component.
• The digit originated near the metatarsophalangeal joint, consistent with the 'floating type' classification.

Findings:

• This case represents an exceedingly rare presentation of floating type postaxial polydactyly.
• The specific morphology and location of the accessory digit in this infant have not been previously documented in medical literature.
• The condition caused practical difficulties for the parents in fitting footwear for the child.

Implications:

• This report expands the understanding of congenital foot deformities and rare presentations of polydactyly.
• Highlights the importance of detailed radiographic assessment in classifying rare limb anomalies.
• Contributes to the medical literature on unusual congenital conditions affecting the pediatric foot.