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| Fig. 16.4 A, Pretibial myxedema. Thick plaques on anterior lower legs with peau d’orange change secondary to dermal mucin. B, Digital mucous cyst. Domeshaped cystic nodule overlying the distal interphalangeal joint. |
A digital mucous cyst is a common solitary, asymptomatic, semitranslucent, dome-shaped nodule that typically presents in adults and elderly patients on the dorsal finger near the proximal nail fold or distal interphalangeal joint (Fig. 16-4B). It may distort the nail matrix, resulting in a groove in the nail plate. Clear, gelatinous mucoid material can be expressed from the cyst. The pathogenesis is controversial; however, it is often attributed to degenerative changes in the distal interphalangeal joints.
Lin YC, Wu YH, Scher RK: Nail changes and association of osteoarthritis in digital myxoid cyst,
Dermatol Surg 34:364–369, 2008.
