Digital mucous (myxoid) cyst

    Also known as: digital myxoid pseudocyst, digital synovial cyst.

    Clinical Features:

    • Dome-shaped papule or nodule on the dorsal proximal nail fold or over an interphalangeal joint
    • Contains viscous mucoid material

    Histologic Features:

    • Cystic mucin-containing spaces devoid of a lining epithelium (hence a "pseudocyst") within the dermis
    • The cystic spaces begin as dermal clefts between collagen bundles and later coalesce to forms a single cystic space.
    • The pseudocysts may occasionally have a synovial lining or a fibrous pseudocapsule.
    • There is sometimes hyperplasia of the overlying epidermis.

    External Links:

    Cases associated with this book:

  • Digital mucous cyst
    Author: Artur Zembowicz M.D. Ph.D.

    Conference: Teaching Collection