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Case of the Week 620


What is the most likely diagnosis?

  • 43 year-old in a previous swimming pool accident



Frontal Radiograph of Pelvis

  1. Osteosarcoma
  2. Paget's disease
  3. Healed Fracture
  4. Heterotopic ossification
  5. Hypervitaminosis D

Additional Images - None

 

Additional Images

 

 

None


Answer:

4. Heterotopic ossification

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Heterotopic ossification

General considerations

  • Defined as the abnormal formation of true bone within extra-skeletal soft tissues
  • More common in males, especially following spinal cord injury, it is rare in young children
  • Formerly called myositis ossificans
    • That term has fallen out of favor because the condition is not always inflammatory and ossification occurs in soft tissues other than muscle
  • Strong association exists between HO and spinal cord or traumatic brain injury
    • About 20-30% of patients with neurologic deficits will develop HO, possibly higher with spinal cord injuries

 

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This Week

43 year-old in a previous swimming pool accident
 
 



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is an award-winning educational website aimed primarily at medical students and radiology residents-in-training, containing  lectures, handouts, images, Cases of the Week, archives of cases, quizzes, flashcards of differential diagnoses and “most commons” lists, primarily in the areas of chest, GI, GU cardiac, bone and neuroradiology.