Ramesh 60 years, presents with generalized bone pain. On examination there is elevated ESR of 100 mm, serum globulin 7, lytic lesions in the skull, serum creatinine of 3.5 mg/dL and serum calcium of 11 mg/dL. What is the most likely diagnosis :
Waldenstrom's macroglobulinemia Multiple myeloma Hyperparathyroidism Osteomalacia