Calcified small cell carcinoma of the lung.

Calcification within pulmonary lesions usually signifies a benign entity, but depending on the specific pattern of calcification it can also represent malignancy. The authors report a case of calcified small cell lung cancer in a patient with end-stage renal disease. The calcification was unrelated to renal failure and not the result of metastatic calcification, and the pattern of calcification and tissue pathology excluded other causes of calcification within this mediastinal mass.