Small cell lung cancer mimicking high-grade lymphoma in a patient with concurrent B-cell lymphoproliferative disorder.

![Figure][1] A 77-year-old woman with a remote smoking history presented with progressive dyspnea, chest discomfort, and hypoxia. Computed tomography showed extensive mediastinal, hilar, and perisplenic adenopathy. Her laboratory work was notable for thrombocytopenia (platelets = 77 K/μL),