Author: Dr. Abdurrahman Almurayshid, Faculty Member at Prince Sattam Bin Abdulaziz University, College of Medicine, Dermatology, Saudi Arabia, 2015.
Digital myxoidpseudocyst is also known as a digital mucouscyst. It is a focal collection of mucin under the skin, and is commonly seen on the distal aspect of the fingers. It is usually a solitary lesion that is skin coloured to translucent.
The corresponding nail can show a grove or structural changes as a pressure effect of the pseudocyst. Osteoarthritis can accompany it, when it is regarded as a type of ganglion. There can be multiple pseudocysts in patients with chronic arthritis. Treatment is mainly to evacuate the content or to remove the cyst using destructive methods or surgery.
Histology of digital myxoidpseudocyst
Digital myxoidpseudocysts can be of two varieties: myxomatous and ganglion.
The myxomatous type has a focaldeposition of mucin in the dermis with surrounding fibrous stroma and no epithelial lining (figures 1–3).
A ganglion is lined by a fibrous wall or a synovial sac.
Mucin appears slightly bluish in routine hematoxylin and eosin stained slides.