Second branchial cleft anomalies present significant diagnostic hurdles in adult patients, frequently mimicking cystic neck pathologies and malignant lymphadenopathy. A 15-year retrospective review of 52 adult surgical cases published in Cureus highlights branchial cysts as the most common presentation, requiring complete surgical excision to minimize recurrence. By contrast, a separate pediatric study analyzing 94 patients at a tertiary care center from January 2006 to September 2016 found that branchial fistulae were the most common lesions in younger populations, followed closely by sinuses.
Although they are congenital conditions stemming from the incomplete obliteration of the branchial apparatus during embryogenesis, these anomalies often persist or present for the first time during a patient’s third or fourth decade of life. Findings shared in Cureus point out that such anomalies can develop anywhere along a path stretching from the skin over the supraclavicular fossa up to the pharyngeal tonsillar fossa region. Because cystic neck lesions in adults must be considered cystic metastases until proven otherwise, diagnosing them reliably remains a demanding clinical task.
Retrospective Findings and Patient Demographics in Adult Cases
A retrospective case series examining 52 adult patients who underwent surgical treatment for second branchial arch anomalies at a tertiary center over a 15-year period between January 2009 and December 2023 sheds light on clinical patterns. Branchial cysts formed the vast majority of presentations, accounting for 35 patients, or 67.3%. These cysts typically presented as right-sided upper neck swellings and showed a higher prevalence among women, who accounted for 30 patients, or 57.7%. In stark contrast, pediatric data published in the National Center for Biotechnology Information (NCBI) database recorded a strong male preponderance, with 70 male patients (74.47%) and 24 female patients (25.53%) out of 94 cases.
Patients were identified from a surgical database after approval from the Institutional Review Board (Silver Ethics and Research Committee) under approval 2508147. Bailey classification on imaging showed predominantly type II lesions in 33 patients (63.5%), followed by type III in 12 patients (23.1%) and type I in seven patients (13.5%). Preoperative diagnostic workups included imaging in 44 patients, representing 84.6% of the cohort. Computed tomography (CT) and magnetic resonance imaging (MRI) demonstrated diagnostic accuracies of 86.7% and 84%, respectively. Histopathological examination of samples consistently suggested benign cystic lesions, with branchial cysts specifically considered a possibility in four patients. Overall, preoperative and postoperative diagnoses achieved an 80.4% concordance rate across 41 of 51 evaluable patients. Where discordance occurred, it nearly always involved lesions initially suspected of representing tuberculous lymphadenitis or malignant cervical lymphadenopathy. Regarding younger patients, the NCBI-documented study noted that the mean age at presentation was 5.07 years for branchial sinuses, 5.79 years for fistulae, and 7.31 years for cysts, with overall ages spanning from a 3-month-old infant to a 14-year-old child.
Surgical Management Strategies and Postoperative Complications
Surgical excision was performed in 51 out of the 52 adult patients, constituting 98.1% of the cohort, while one patient with an infected branchial cyst was managed solely through incision and drainage. Surgeons utilized a transverse cervical incision in 39 patients, whereas a stepladder incision—first described by Bailey in 1933—was selected for 14 patients with more complex tracts.
Intraoperatively, only 15 adult patients, or 28.8%, possessed a tract extending to the pharyngeal wall, supporting established observations that complete fistulas are rare in second branchial arch anomalies. On the other hand, findings from the NCBI pediatric review indicated that branchial fistulae actually constituted the most frequent lesion type among unilateral presentations, while also remarking that second branchial cysts very rarely exhibit mediastinal extension which can complicate diagnosis; therefore, an MRI of the neck and thorax is advised if ultrasound imaging of the neck leaves any uncertainty regarding mediastinal involvement. Furthermore, while adult management relies heavily on advanced imaging, the NCBI source notes that preoperative sinograms, fistulograms, and intraoperative methylene blue dye injections are not mandatory for excising a branchial sinus or fistula. Postoperative complications in the adult cohort developed in six patients, representing 11.5% of the total group—including nerve-related issues in four patients (7.7%), seroma in one patient (1.9%), and a surgical site infection in one patient (1.9%). Meanwhile, the NCBI source reported post-operative wound infection in four patients (4.25%) as well as recurrence observed in two patients (2.12%) who had multiple preoperative infections.
Recurrence Risks and Long-Term Patient Follow-Up
Out of 52 total adult patients, 26 experienced no recurrence, two experienced a recurrence, and 24 were lost to follow-up. When looking specifically at the 28 patients with documented follow-up, the Cureus-cited recurrence rate stood at 7.1%. Both recurrent cases occurred in patients with Bailey type III lesions who also had a history of prior procedures performed before definitive surgery—specifically affecting one patient in the cyst group and one in the sinus/fistula group.
These findings align with broader surgical literature demonstrating that complete surgical removal is the primary and permanent remedy for second branchial anomalies, given that such growths never resolve independently and carry a high probability of recurrent infections. Although the observed associations between recurrence, prior interventions, and Bailey type III lesions remain exploratory, larger prospective cohorts with long-term follow-up are needed to establish definitive risk factors for recurrence in adults. Readers should consult qualified medical professionals for personal health concerns, clinical evaluations, and individual treatment decisions.
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