A 47-year-old woman comes to the physician following the gradual onset of back pain the past 3 weeks. She has no history of trauma. She is a non-smoker, non-drinker. Laboratory studies and urinalysis show no abnormalities. An x-ray of the spine shows two lytic lesions at T8 and T9. Which of the following is the most likely explanation for these findings?
Avascular necrosis
Metastatic ductal carcinoma of the breast
Osteosarcoma
Pott disease
Renal osteodystrophy
