Ganglion of tendons is an example of -
Ganglion

A ganglion is a small cyst located near a joint capsule or tendon sheath. A common location is around the joints of the wrist where it appears as a firm, fluctuant, pea-sized, translucent nodule. It arises as a result of cystic or myxoid degeneration of connective tissue; hence the cyst wall lacks a true cell lining. The fluid in the cyst is similar to the synovial fluid; However, there is no communication with the joint space.
Neoplastic process
Malformation
Amyloid deposition
Myxomatous degeneration