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Occult fractures are those that are not visible on imaging, most commonly plain radiographs and sometimes CT, either due to lack of displacement or limitations of the imaging study. There may be clinical signs of a fracture without one actually being seen. MRI or nuclear medicine studies are sometimes required to make the diagnosis.
Technically any fracture may be occult, but classic examples include:
- 1. Pearls and Pitfalls in Musculoskeletal Imaging. Cambridge University Press. (2013) ISBN:0521196329. Read it at Google Books - Find it at Amazon
- 2. National Clinical Guideline Centre (UK). The Management of Hip Fracture in Adults [Internet]. London: Royal College of Physicians (UK); 2011. (NICE Clinical Guidelines, No. 124.) 5, Imaging options in occult hip fracture. Available from: http://www.ncbi.nlm.nih.gov/books/NBK83026/