On the above a table with well-defined osteolytic bone tumors and tumor-like lesions in different age-groups.

-Notice the following:

-In patients <>

-In patients > 40 years metastases and multiple myeloma are by far the most common well-defined osteolytic bone tumors.

- Patients with Brown tumor in hyperparathyroidism should have other signs of HPT or be on dialysis.

-Differentiation between a benign enchondroma and a low grade chondrosarcoma can be impossible based on imaging findings only.

- Infection is seen in all ages.

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