I have been diagnosed a ganglion cyst. What is it made of?

Thick fluid. Fluid from a joint or tendon sheath leaks into the ganglion sac..The more water soluble elements diffuse out, leaving a thicker gelatin like substance.
Fibrous wall & fluid. It is made of an outer wall of fibrous connective tissue and filled with a thick viscous synovial fluid like center composed primarily of hyaluronic.
Synovial lining. Ganglion cyst is a ruptured synovial capsule which is the shock absorber between bones. The fluid leaks out and is contained by a fibrous capsule which is the cyst.