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(a) Diffuse large B-cell lymphoma in a 32-year-old male. A chest radiograph demonstrates a large opacity in the right middle lobe obscuring the right heart border. (b) A multidetector CT scan in the same patient demonstrates a well-circumscribed right middle lobe mass with central low attenuation, consistent with necrosis (arrow). This was proven on biopsy to represent a primary form of diffuse large B-cell lymphoma.
