Overview
what it is and why it mattersA mucous cyst is a ganglion cyst that arises from the DIP (distal interphalangeal) joint at the fingertip, almost always in association with underlying DIP joint osteoarthritis. The cyst appears as a smooth, tense, translucent dome on the dorsum of the fingertip between the DIP joint and the nail fold. Pressure on the germinal matrix of the nail can cause a longitudinal nail groove.
They are most common in women over 50 and most often affect the middle or index finger.
Diagnosis
exam first, imaging secondDiagnosis is clinical: characteristic location, transillumination, associated DIP arthritis on exam, and often a nail groove. X-ray of the finger confirms DIP joint arthritis and osteophytes that are the underlying cause.
Treatment Path
how care progresses at OSI1
Observation
Small, asymptomatic cysts can be watched; some resolve spontaneously.
2
Aspiration
Needle decompression provides temporary relief; recurrence is high without excising the underlying osteophyte.
Surgical Options at OSI
if non-operative care isn't enoughExcision is recommended for symptomatic, recurrent, or draining cysts. A draining cyst carries infection risk to the joint.
Providers Who Treat Mucous Cyst
sports-medicine team
Further Reading
authoritative sourcesExternal patient-education references and related OSI pages for additional background: