DIGITAL MYXOID CYST
DIGITAL MYXOID CYST ICD-10: M25.8
• A digital myxoid cyst is a pseudocyst occurring over the distal interphalangeal joint and the base of the nail of the finger (Fig. 9-35A) or toe, often associated with Heberden’s (osteophytic) node.
• The lesion occurs in older patients, usually >60 years of age.
• It is usually a solitary cyst, rubbery, translucent. A clear gelatinous viscous fluid may be expressed (Fig. 9-35B).
• When the myxoid cyst is over the nail matrix, a nail plate dystrophy occurs in the form of a 1- to 2-mm groove that extends to the length of the nail (Fig. 9-35A).
• Various methods of management have been advocated, including surgical excision, incision and drainage, injection of sclerosing material, and injection of a triamcinolone suspension.
A B
FIGURE 9-35 • Digital myxoid cyst (A) The cyst has led to a 3- to 4-mm groove of the nail plate. (B) Slitting it with a scalpel and pressure releases a gelatinous viscous fluid.