A 40-year-old male with a lateral neck mass undergoes fine needle aspiration cytology showing squamous cells in cystic fluid. Which investigation is most critical to perform next before assuming a diagnosis of branchial cyst?
- A Ultrasound neck with guided FNA repeat
- B Panendoscopy (direct laryngoscopy, esophagoscopy, bronchoscopy) to exclude cystic squamous cell carcinoma metastasis from an occult primary ✓
- C CT neck with contrast only
- D Excision biopsy of the cyst immediately without further investigation
Correct answer: B. Panendoscopy (direct laryngoscopy, esophagoscopy, bronchoscopy) to exclude cystic squamous cell carcinoma metastasis from an occult primary
Explanation
A lateral neck cyst with squamous cells on FNA in a patient over 40 must be considered a metastatic cystic squamous cell carcinoma from an occult pharyngeal primary (especially HPV-associated oropharyngeal SCC — tonsillar or tongue base) until proven otherwise. The term 'branchial cyst carcinoma' is largely discredited. Panendoscopy with directed biopsies of the nasopharynx, tongue base, tonsillar fossa, and pyriform sinus is essential, along with PET-CT, before labeling it a benign branchial cyst. Missing an occult primary has serious oncological consequences.
Reference: Dhingra Diseases of Ear, Nose and Throat, 7th ed.
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Written and medically reviewed by the StethoPrep medical team.