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Updated: May 17, 2026

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Dissection and Flat-mounting of the Threespine Stickleback Branchial Skeleton
Published on: May 7, 2016
Second branchial sinus - A case report.
N Hemaraju1, S K Nanda, B Shankar
1Dept of ENT, Sree Siddhartha Medical Colllege&PG Reaserch Center. Tumkur, Karnataka.
Summary
Branchial apparatus anomalies can lead to branchial sinus or fistula formation due to incomplete fusion of embryonic structures. This case highlights a common anomaly of the second branchial arch in an 18-year-old male.
Area of Science:
- Embryology
- Anatomy
- Surgical Pathology
Background:
- The branchial apparatus develops from six pairs of mesodermal arches.
- Pharyngeal pouches and branchial clefts form from endodermal and ectodermal invaginations, respectively.
- Incomplete fusion of these structures can result in congenital anomalies like branchial sinuses or fistulas.
Purpose of the Study:
- To present a case of branchial sinus.
- To emphasize the commonality of second branchial arch anomalies.
Main Methods:
- Case report presentation.
- Clinical case review.
Main Results:
- An 18-year-old male presented with a branchial sinus.
- This anomaly is a manifestation of a second branchial arch malformation.
Conclusions:
- Branchial sinuses are congenital anomalies resulting from developmental errors in the branchial apparatus.
- Second arch anomalies are the most frequent type, as illustrated by this case.
Keywords:
Branchial Sinus