Primary Extranodal Non-Hodgkin Lymphoma in the Infra-Orbital Region – A Diagnostic Challenge.

Lymphomas within the head and neck region (HNR) are relatively uncommon; however, they can mimic common odontogenic conditions leading to diagnostic delays and subsequently the implementation of treatment. We report a case of a chronic infra-orbital swelling which, following excision, was diagnosed as an extranodal low grade Non-Hodgkin lymphoma. This paper explains the mode of presentation of extranodal lymphomas in the HNR, so that dental practitioners may consider it as a potential diagnosis when presented with a lump in the HNR. Clinical relevance: Extranodal lymphomas presenting within the head and neck region can have a multitude of clinical presentations, which may often resemble odontogenic conditions. This can cause confusion, resulting in diagnostic delays and treatment. This case highlights the importance of being aware of the features of extranodal lymphoma in the head and neck region, and the diagnostic challenges that may be encountered.