case_images: PMC7273617_01
case_images: (a) Patient's panoramic radiograph: this radiograph was initially considered
  non-suggestive of bone destruction in the right mandibular body and ramus. However, a
  more careful observation would have revealed ill-defined radiolucency of the ascending
  ramus of the mandible (right side), loss of lamina dura of the second right molar (#47)
  and loss of the right mandibular canal wall, implying a possible malignancy. (b) CBCT
  revealed an osteolytic lesion of the right mandibular retromolar area, extending to the
  inferior alveolar canal and the tooth #46.
case_images: 10.1177_2050313X20927961-fig1.jpg
case_images: PMC7273617_01_10.1177_2050313X20927961-fig1.jpg
case_images: fig1-2050313X20927961
case_images: Panoramic radiograph was taken, and the diagnosis of periodontal disease was made (Figure 1(a)). The patient was immediately referred to an oral and maxillofacial surgeon and underwent cone beam computed tomography (CBCT) that revealed an extensive osteolytic lesion of the right mandibular retromolar region (Figure 1(b)).
case_images: (a) Histopathological photomicrograph of the oral lesion illustrating lymphocytic
  infiltration of the sub mucosal connective tissue. H and E stained section 250x. (b)
  Higher power showing a monotonous population of numerous atypical lymphocytes with
  hyperchromatic irregular nuclei with inconspicuous nucleoli. Isolated mitotic figures of
  the tumor cells are also seen. H and E stained section 400x.
case_images: 10.1177_2050313X20927961-fig2.jpg
case_images: PMC7273617_01_10.1177_2050313X20927961-fig2.jpg
case_images: fig2-2050313X20927961
case_images: Histopathological examination showed a diffuse proliferation of small-to-intermediate-sized lymphoid cells that infiltrated the sub-mucosal connective tissue stroma (Figure 2(a)). The tumor cells exhibited hyperchromatic nuclei, a high nuclear cytoplasmic ratio, and irregular nuclear contours, while mitotic figures were also seen (Figure 2(b)).