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digital mucous cyst

Thursday 25 July 2013

digital mucous cysts; mucoid cysts, synovial cysts, myxoid cysts, myxomatous cutaneous cysts.

WKP emedecine

Definition: Digital mucous cysts are nodules of the distal interphalangeal joint (DIP) of the hand or of the toes. A myxoid cyst is a cutaneous condition often characterized by nail plate depression and grooves.


- Macroscopy :

- Microscopy :


In 60-80% of cases, mucous cysts are associated with degenerative joint disease of the DIP joint. Studies have shown a pedicle between the cyst and the DIP joint capsule


The mechanism of formation of digital mucous cysts is unknown. Currently, it is believed that the cysts arise from mucoid degeneration of connective tissue and that this process, in most cases, involves communication with the adjacent DIP joint and possible coexistence of osteoarthritis.

Clinical and radiographic evidence of osteoarthritis is common at the site of the cysts, and the frequent presence of osteophytes and spurring of the DIP joint were recognized in the 1970s.

Active connection to the joint space may or may not exist, as the mucoblasts associated with the cyst appear capable of sustaining the process.