The Microbiology Characteristics of Infected Branchial Cleft Anomalies

Patho-Anatomic Spectrum of Branchial Cleft Anomalies: Proposal of Novel Classification System

PURPOSE

Histogenesis, nomenclature, and classification of branchial cleft anomalies (BCAs) have been subjects of controversy for decades. The purpose of this study was to investigate the accuracy of current developmental theories (congenital, lymph node, and hybrid branchial inclusion theories) in defining the anatomic and histopathological characteristics of BCAs.

METHODS

Ninety consecutive patients with BCAs who underwent surgical excision were enrolled in this 2-center retrospective cohort study.

RESULTS

The present study included 90 patients: 46 (51.11%) women and 44 (48.89%) men (P > .05). The mean age at presentation was 31.89±17.31 years. Altogether, 92 BCAs were identified within the study population including 49 (53.26%) on the left side and 43 (46.74%) on the right side (P > .05). The BCAs included 79 (85.87%) branchial cleft cysts, 11 (11.96%) branchial cleft sinuses, and 2 (2.17%) branchial cleft fistulae. Three (3.26%) BCAs were distributed in the head regions, 88 (95.65%) in the neck regions, and 1 (1.09%) in the thoracic cavity. Following surgery, lymphoepithelial tissue was detected in the histopathological examination in 83 (90.22%) BCAs. The hybrid branchial inclusion theory exhibited significantly higher accuracy in defining patho-anatomic characteristics of BCAs than the branchial apparatus, precervical sinus, thymopharyngeal, and inclusion theories (90.22, 9.78, 2.17, 0.00, and 0.00%; respectively) (P < .05).

CONCLUSION

The novel branchial node (BN) classification system based on the hybrid branchial inclusion theory appears to be superior to other classification systems in determining the patho-anatomy of BCAs.

Branchial cleft anomalies: hybrid "Branchial Inclusion" theory

PURPOSE

Branchial cleft anomalies (BCAs) are developmental malformations of the head and neck region. Their histogenesis has been the subject of controversy and is not fully understood. This study aimed to test all present developmental theories ("branchial apparatus," "precervical sinus," "thymopharyngeal," and "inclusion" theories) on a sample of 48 BCAs from a single institution.

METHODS

We performed a retrospective analysis of clinical-epidemiological and anatomical-pathological characteristics of BCAs treated over a 12-year period in our hospital.

RESULTS

Overall, 46 patients (24 [52.17%] women and 22 men [47.83%]) underwent surgical excision of 48 BCAs. The mean patient age at presentation was 31.65 ± 19.40 years. Branchial cleft cysts were found in 42 (87.50%) cases, and branchial cleft sinuses were found in six (12.50%) cases. Eight (16.67%) BCAs were distributed in the preauricular region, 34 (70.83%) at the anterior border of the sternocleidomastoid muscle (SCM), three (6.25%) at the posterior border of the SCM, two (4.17%) in the suprasternal notch, and one (2.08%) in the retrosternal space. Histopathologically, 39 (81.25%) BCAs had a lymphoepithelial structure and nine (18.75%) BCAs had solitary epithelial cells. Inflammation and infection were observed in 24 (50%) and 12 (25%) cases, respectively.

CONCLUSION

None of the hypothesized developmental theories fully explain the embryonic origin of BCA in our study sample. A possible explanation of BCA histogenesis is through the hybrid "branchial inclusion" theory.