Background: Digital mucous cyst is a benign painless skin lesion most commonly observed on the dorsum of the terminal digits, and sometimes on the toes. The lesion generally solitary and less than 10 mm in diameter. It can be opalescent or has the color of the skin. Diagnosis of the condition can be established on clinical basis.

Patients and methods: A healthy man who was born in 1983 consulted us about a small lump on the dorsum of the left thumb. Images are presented, diagnosis is described, and a brief educational review is presented.

Results: The lump was painless and has been noticed more than two years ago. It was cystic in nature and located on the dorsum of the terminal phalanx of the left thumb. It was less than 10 mm in diameter. The diagnosis of digital mucous cyst was made.

Conclusion: Although consensus has not been confirmed regarding the treatment of digital mucous cyst, small and asymptomatic lesion needs no further treatment or follow- up.

Digital mucous cyst is a benign painless skin lesion most commonly observed on the dorsum of the terminal digits, and sometimes on the toes. The lesion generally solitary and less than 10 mm in diameter. It can be opalescent   or   has  the   color   of  the skin. Diagnosis of the condition can be established on clinical basis [1-5].

Patients and methods

A healthy man who was born in 1983 consulted us about a small lump on the dorsum of the left thumb. Images are presented, diagnosis is described, and a brief educational review is presented

The lump was painless and has been noticed more than two years ago. It was cystic in nature and located on the dorsum of the terminal phalanx of the left thumb. It was less than 10 mm in diameter (Figure-1). The diagnosis of digital mucous cyst was made.

Although consensus has not been confirmed regarding the treatmentof digital mucous cyst, the patientin this paper was consulted according to the availableevidence suggesting in such small and asymptomatic lesion, no furthertreatment or follow-up is necessary [4,5].

The occurrence of digital mucous cyst was reported as early as the late 1800s, and early 1900s. I was also called myxoid cyst, synovial cyst, and digital ganglion cyst. (Hyde, 1882; Ledderhose, 1893; Ritschel, 1895; Carp and Stout, 1928) [1].

In 1988, Loder et al emphasized the histopathological similarity between digital mucous cysts and dorsal wrist ganglia when examined by light microscopy and scanning electron microscopy. Both lesions had a wall formed by a porous net of collagen fibers, and both had a fibrillated inner surface consisting of randomly arranged collagen fibers, and an intermittent thin membrane. In both lesions, there was no evidence of a cellular lining. Therefore, Loder et al suggested a shared cause for the two lesions [2].

Although consensus has not been confirmed regarding the treatment of digital mucous cyst, small and asymptomatic lesion needs no further treatment or follow-up.

Conflict of interest: None.