Persistent pharyngeal pouch derivatives in the neonate.

Area of Science:

• Pediatric Surgery
• Developmental Biology
• Otolaryngology

Background:

• Branchial anomalies are congenital malformations of the pharyngeal arches.
• Internal branchial sinuses are exceptionally rare compared to external or complete fistulas.
• Understanding the embryological origin is crucial for diagnosis and management.

Observation:

• A neonate presented with an inflammatory, air-containing lateral neck mass.
• The mass was diagnosed as an internal branchial sinus.
• Imaging and clinical presentation suggested a specific embryological origin.

Findings:

• The internal branchial sinus in this case likely originated from the fourth pharyngeal pouch.
• A review of six similar cases supports this being a well-defined clinical entity.
• This entity presents as a distinct inflammatory neck mass in neonates.

Implications:

• This finding aids in the differential diagnosis of neonatal neck masses.
• It emphasizes the importance of considering pharyngeal pouch derivatives in congenital neck anomalies.
• Further research into the embryogenesis of these rare sinuses is warranted.