# Primary Bone Lymphoma of the Jaw Masquerading as Infection and Delaying Treatment

## TL;DR

Two patients with jaw lymphoma were misdiagnosed as having dental infections, leading to significant delays in cancer treatment.

## Contribution

Highlights the diagnostic challenge of primary bone lymphoma of the jaw, emphasizing the need for early suspicion in unresponsive dental cases.

## Key findings

- Two patients were misdiagnosed with osteomyelitis and treated with antibiotics for 8.5 months before lymphoma was diagnosed.
- Both patients achieved remission after initiating cytotoxic chemotherapy following correct diagnosis.
- Primary bone lymphoma of the jaw is rare and often mimics dental infections, causing diagnostic delays.

## Abstract

Background: Diffuse large B cell lymphoma is an aggressive, heterogeneous yet treatable disease. Primary bone lymphoma is a lymphoma involving a single or multiple osseous sites with or without regional nodal involvement. It is exceedingly rare, representing <1% of new non-Hodgkin lymphoma cases per year. Most cases of primary bone lymphoma are diffuse large B cell lymphoma. They infrequently involve the craniofacial bones and mandible; its rarity can lead to delays in diagnosis. Case Series Presentation: Two 64-year-old male patients initially presented to local dentists with concerns of tooth pain and numbness. Both underwent extensive dental procedures including extraction and debridement, with an initial diagnosis of osteomyelitis. They were placed on long-term antibiotics. After months without improvement, further testing was pursued, including imaging and repeat biopsies. The patients were finally diagnosed with primary bone diffuse large B cell lymphoma. From the initial treatment of osteomyelitis, a median time of 8.5 months passed before diagnosis of lymphoma. Treatment with cytotoxic chemotherapy was initiated and both patients achieved remission. Conclusions: As in the two cases presented here, the initial point of entry into the medical system may be a visit to the local dentist. When patients present with periodontal complaints, it is imperative to maintain a broad differential, including lymphoma. This is especially crucial when the patient’s clinical course does not respond to initial treatment. This results in delays of diagnosis and initiation of therapy for a treatable cancer.