A 62-year-old man has had dull, constant back pain for 3 months. He recently developed a cough productive of yellowish sputum. On physical examination there are crackles at the right lung base. A plain film radiograph of the spine reveals several 1 to 2 cm lytic lesions of the vertebral bodies. Laboratory studies show glucose 78 mg/dL, urea nitrogen 49 mg/dL, creatinine 5 mg/dL, total protein 8.3 g/dL, albumin 3.7 g/dL, alkaline phosphatase 176 U/L, AST 45 U/L, ALT 22 U/L, and total bilirubin 1.2 mg/dL. A sputum culture grows Streptococcus pneumoniae. Which of the following pathologic findings is most likely to be seen in a bone marrow biopsy from this man? Scattered small granulomas Hypercellularity with many blasts Nodules of small mature lymphocytes

A 62-year-old man has had dull, constant back pain for 3 months. He recently developed a cough productive of yellowish sputum. On physical examination there are crackles at the right lung base. A plain film radiograph of the spine reveals several 1 to 2 cm lytic lesions of the vertebral bodies. Laboratory studies show glucose 78 mg/dL, urea nitrogen 49 mg/dL, creatinine 5 mg/dL, total protein 8.3 g/dL, albumin 3.7 g/dL, alkaline phosphatase 176 U/L, AST 45 U/L, ALT 22 U/L, and total bilirubin 1.2 mg/dL. A sputum culture grows Streptococcus pneumoniae. Which of the following pathologic findings is most likely to be seen in a bone marrow biopsy from this man? Scattered small granulomas Hypercellularity with many blasts Nodules of small mature lymphocytes