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Case of the Week 494



What is the most likely diagnosis?

  • 32 year-old with hip pain after fall



AP and lateral view of right hip

  1. Heterotopic Ossification
  2. Avulsion of Ant. Sup. Iliac Spine
  3. Pelvic digit
  4. Fracture of Ischium
  5. Foreign Body

Additional Images - Coronal Reformatted CT of Pelvis

 

Additional Images

 

Coronal Reformatted CT of Pelvis


Answer:

 

3. Pelvic Digit

 

More (Click Discussion Tab)

 

 

Pelvic Digit

General Considerations

  • Rare congenital anomaly
  • Bone develops in soft tissue
  • Can arise from any of the pelvic bones; also anterior abdominal wall
    • Most commonly arises from ilium
  • Unilateral
  • Believed to arise in mesenchymal stage of bone growth within first 6 weeks of embryogenesis

 

MORE . . .

 


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32 year-old with hip pain after fall
 
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LearningRadiology.com
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.