Congenital panfollicular nevus associated with polydactyly

Area of Science:

• Dermatology
• Pediatric Genetics
• Developmental Biology

Background:

• Congenital anomalies of the hand, such as thumb duplication and syndactyly, present unique clinical challenges.
• Cutaneous findings in pediatric patients can sometimes indicate underlying genetic syndromes or developmental abnormalities.

Observation:

• A 2-year-old girl presented with ulnar-sided thumb duplication and first web space syndactyly.
• She also had asymptomatic papules on her left hand and wrist, clinically suggestive of a linear epidermal nevus.
• Microscopic examination revealed basaloid epithelial aggregates with abortive hair follicle formation, consistent with congenital panfollicular nevus.

Findings:

• The case demonstrated an association between congenital panfollicular nevus and distal thumb polysyndactyly.
• Histopathological analysis confirmed the presence of abortive hair follicle structures within the nevus.
• This presentation aligns with the novel entity described as congenital panfollicular nevus.

Implications:

• The co-occurrence suggests a potential shared developmental pathway between limb patterning and hair follicle morphogenesis.
• Further research may elucidate the genetic and molecular mechanisms underlying this association.
• This case highlights the importance of thorough dermatological and orthopedic evaluation in children with congenital limb anomalies.