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The management of enlarged retropharyngeal lymph nodes (RLN) in patients with confirmed oral, oropharyngeal, or nasopharyngeal squamous cell carcinoma (SCC) has prognostic relevance and is a challenge for the clinical teams. There is, however, no consensus regarding their clinical management or radiographic evaluation. The aim of this review therefore was to present the current thinking on management to help improve outcomes. We searched several online databases using the key terms "retropharyngeal node", "oral cancer", "head and neck cancer", "oropharyngeal cancer", "nasopharyngeal cancer", "nasopharynx", "oral cavity", "oropharynx", "TORS", and "radiotherapy". A total of 1024 papers were screened, of which 32 were eligible. There was no consensus about the management of RLN. There is a lack of randomised studies and a lack of consistency in the presentation of results. Management should be tailored in patients with nasopharyngeal carcinoma (NPC), and prophylactic irradiation is warranted as these nodes are at high risk of metastasis. In patients with non-NPC tumours, we prefer to resect them during primary operations when there is radiological uncertainty or evidence that they are affected, as the combination of radiological and histological outcomes will further our understanding. In both NPC and non-NPC tumours, sampling may also help to standardise the radiological criteria for the diagnosis of RLN by contrast-enhanced computed tomography (CT), magnetic resonance imaging (MRI), and positron emission tomography (PET) CT.

The coexistence of different types of malignancy in cervical lymph nodes has been reported previously. We report the first case, to the best of our knowledge, of concurrent metastatic adenoid cystic carcinoma and squamous cell carcinoma (SCC) in cervical lymph nodes. A primary SCC developed three decades after treatment for adenoid cystic carcinoma of the palate, and the synchronous metastases became clinically apparent the following year. The aetiology of the SCC may have been related to radiotherapy or smoking. Whether the adenoid cystic carcinoma would have remained dormant, or was reactivated after perturbation of host defence mechanisms, is not known.