The X Files - April 2009

Marshall Deltoff
April 27, 2009
Written by Marshall Deltoff
Metastatic Bone Disease: A Brief Overview
Malignant metastatic bone disease arguably represents the most common sinister condition presenting in practice. Its various forms are characterized radiographically by lesions with ill-defined margins – wide zone of transition – variations in size, haphazard asymmetrical distribution, and, with progression, loss of cortical integrity and/or pathological fractures.

Figure 1 demonstrates universal mixed metastatic disease seen throughout the entire visualized skeleton. Note the various patches of ill-defined sclerosis adjacent to ill-defined regions of rarefaction, all of varying size, and asymmetrically distributed.  Although spread throughout every bone seen here, observe the total maintenance of each joint space. (Differential diagnosis: aggressive infectious process.)

Some Points to Remember About Metastatic Disease
  • most metastases to bone arises from a primary carcinoma in a patient over 40 years of age
  • may produce an osteolytic (75 per cent), osteoblastic (15 per cent) or mixed (10 per cent) pattern
  • prostate and lung are most common primary sites in males
  • lung and breast are most common primary sites in females
  • 80 per cent of osteolytic metastasis occurs in the axial skeleton: back pain is often the presenting complaint of a patient with an undetected primary malignant tumour that has metastasized to the spine
  • it is therefore prudent to consider metastatic bone disease in the differential diagnosis of a patient over 40 presenting with unexplained back pain
  • there is usually no periosteal response (differential diagnosis: primary bone neoplasm)
  • metastasis is rare distal to the elbow or knee
  • a lesion requires 30 to 50 per cent bone destruction to be visualized on plain film
  • bone scan (scintigraphy) is 10 times more sensitive than plain film

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