Mandibular involvement of plasmacytoma - Uncommon case report of rare entity.

Solitary plasmacytoma (SP) is an early-stage plasma cell malignancy that is in between monoclonal gammopathy of undetermined significance (MGUS) and multiple myeloma (MM) along the spectrum of plasma cell disorders. SPs can be divided into 2 groups according to location: solitary bone plasmacytoma (SBP) - these occur most commonly in the vertebrae and secondarily in long bones, and extramedullary plasmacytoma (EMP) - these encompass all nonosseus SPs. The etiology is still unknown, and they generally display a destructive course with preponderance of males. Both lesions present a risk of progression to multiple myelom. Its presence in jaws is extremely rare and when it is seen, angulus and ramus mandible are most common sites of occurrence. Histopathological examination and systemic investigation are mandatory for confirmation but support of immunohistochemistry positivity for CD138 was also done for establishing the final diagnosis.