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Cutaneous metaplastic synovial cyst: unusual presentation with "a bag of worms"
1Department of Dermatology, National Taiwan University Hospital, and National Taiwan University College of Medicine, Taipei, Taiwan.
Background:
Cutaneous metaplastic synovial cyst (CMSC) is a rare cystic tumor that is unfamiliar to most dermatologists. A traumatic history usually precedes its onset. CMSC is often misdiagnosed as suture granuloma clinically. A correct diagnosis requires histopathologic examination to reveal its characteristic features, that is, a cystic tumor line by synovium-like structure.
Objective:
To describe a case of CMSC encountered during dermatologic surgery practice. We present an unusual case with elongated projections.
Methods:
A case report and literature review are presented.
Conclusion:
The differential diagnosis of tender cutaneous cysts should include CMSC. Projections from the cyst wall may attain significant size and give the intraoperative impression of a "bag of worms."
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