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Case of the Week 444




What is the most likely diagnosis?

  • 37 year-old carpenter with a mass in the finger



Conventional Radiographs of the Hand

  1. Sarcoid
  2. Ewing Sarcoma
  3. Epidermal Inclusion Cyst
  4. Rheumatoid Arthritis
  5. Chondroblastoma

Additional Image - Another Conventional Radiograph of the Hand

 

Additional Images

 

Conventional Radiograph of the Hand

 


Answer:

 

3. Epidermal Inclusion Cyst

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More (Click Discussion Tab)


 

Epidermal Inclusion Cyst

 

General Considerations

  • Associated with trauma, especially penetrating trauma
  • Usually in bones that are superficially located such as fingers, foot and calvarium
  • Implantation of epithelium that form cysts leading to bone erosion
  • Subungual crush-type injuries have been associated with inclusion cysts as has prior surgery

 

MORE . . .


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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.