Extra Nodal Lymphoma: A Pictorial Review of Cross Sectional Imaging Findings.

Lymphomas are a heterogeneous group of malignancies, all of which arise from a given stage in lymphocyte ontogeny but which have highly variable clinical and imaging manifestations. Immunosuppression from any cause is a well-known risk factor for certain subtypes. Lymphoma may be unifocal, multifocal, or diffuse, affect isolated lymph nodes or any organ system, and demonstrate a range of imaging appearances at almost every site. Primary extranodal lymphoma refers to disease restricted to a single organ, although it can be multifocal. Here, we present a pictorial review of extranodal lymphoma manifestations. The World Health Organization International Classification of Disease (2008) recognizes more than 50 types of lymphoma based on histopathologic, immunohistochemical, cytogenetic, and molecular analyses.1 Lymphoma is a relatively common malignancy affecting all ages, but it predominantly affects those in later life. Extranodal lymphoma occurs in about 40% of the patients with lymphoma and has been described in virtually every organ and tissue.2 Extranodal lymphomas are more commonly non-Hodgkin lymphoma (NHL) than Hodgkin’s lymphoma.3 Diagnostic imaging provides important information for staging and response assessment in patients with lymphoma (Figure 1-48).

Cemento-ossifying Fibroma: A Case Report.

Cemento-ossifying fi broma is a benign rare tumor of mesenchymal origin seen in the third or fourth decade in females. It arises from the mesenchymal blast cells of the periodontal ligament and can mature into cementum, bone, or fi brous tissue or varying proportions of each. Th e lesion is most commonly seen in the jaw. It appears as a well-defi ned circumscribed unilocular radiolucent lesion. Radio-opacity of the lesion depends on the concentration of cement or bone or in the concentration of both. We present the imaging features of cemento-ossifying fi broma in a 73-year-old female patient, involving the left maxilla.