Abstract
Many guidelines recommend random directed biopsies of the nasopharynx, contralateral tonsil, and hypopharynx to evaluate an unknown primary squamous cell carcinoma of the head and neck. There are no published data documenting the need for these recommendations. The purpose of our study was to report the rate of positive blind biopsies in this setting. We recorded the rate of positive random directed biopsies performed as part of the workup for 156 patients treated with radiotherapy between 1985 and 2014 for an unknown primary squamous cell carcinoma presenting with the main location of adenopathy in nodal stations 2, 3, 4, or 5. Rate of positive result by subsite: nasopharynx and pyriform sinus = 0%; tonsillectomy: ipsilateral = 39%, bilateral = 6%; and base of tongue = 18%. With modern imaging, random directed biopsies of the nasopharynx and hypopharynx are unnecessary in the workup of unknown primary squamous cell carcinoma of the head and neck.
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