Suspect metastatic malignancy in an elderly patient with progressive and constant back pain that is worse at night and unrelieved by rest + history of weight loss.

Blastic lesions : Prostate and Breast CA

Lytic lesions: Lung, renal, breast, thyroid, multiple myeloma

Dx

Best initial = Plain X-rays

Bone scan is most sensitive in early disease (however, it is not helpful in purely lytic lesion like MM)

MRI is the best

Spinal cord compression

involvement of the spine is

Malignant pericardial and pleural effusion

Chest pain in pericardial effusion is usually relieved by leaning forward