Hello، Age, gender and history about patient. Why he did take the MRI in first place?
Does she have fever, respiratory symptoms or other symptoms like night sweating, loss of weight?
First you need to do a PET scan to look for other metastasis, and a full workup (exam, labs, history) to look for an origin for a malignancy. Reverse the order on the previous sentence.
Backache for past two months. No other symptoms such as fever or weight loss