Sacral and parasymphyseal insufficiency fractures

Case contributed by Andrew Dixon
Diagnosis certain

Presentation

Lower back pain and pelvic pain.

Patient Data

Age: 70 years
Gender: Male

Subacute insufficiency fractures of the sacrum (vertical fractures of the bilateral ala and horizontal fracture through the body at S1-2. Subacute insufficiency fracture of the right parasymphyseal pubic bone.    

Bone scan demonstrates increased uptake at the sites of fracture. A focus of increased uptake is also seen in the right humeral head.

Right humeral head posterior subchondral lucency with increased uptake on bone scan most in keeping with insufficiency fracture/AVN. 

Case Discussion

Subacute sacral and right parasymphaseal insufficiency fractures. The mixed lucent and sclerotic appearance and presence of the right pubic bone lesion may cause the inexperienced reader to misdiagnose this as osseous metastatic disease with pathological fracture, however the fracture distribution is characteristic of insufficiency fracture.  

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