A 17-Year-Old Girl Is Brought to the Office for Evaluation

A 17-year-old girl is brought to the office for evaluation of a right wrist mass.  She noticed swelling on the top of her wrist approximately 3 months ago but said that it did not bother her until she was teased about it in school.  She has no other concerns.  Examination shows a nontender, rounded mass on the dorsal wrist that transilluminates with a penlight.  An image of the mass is shown below: Which of the following is the most likely underlying etiology?

A) Benign proliferation of fat cells
B) Degeneration of periarticular tissue
C) Immune-mediated joint destruction
D) Malignant transformation of synovial tissue
E) Uric acid crystal deposition

Correct Answer:

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