Which of the following is a typical feature of ganglion cysts?

A typical feature of ganglion cysts is that they are fluid-filled sacs. These cysts commonly develop along the tendons or joints, particularly in the wrists or hands. They are benign and usually arise from the tissue surrounding a joint or tendon sheath, forming a cystic structure that contains a gel-like fluid. The composition of the fluid is similar to synovial fluid, which lubricates joints. Ganglion cysts can vary in size and may change with activity, but their defining characteristic remains the presence of this fluid-filled sac, distinguishing them from other conditions that may involve bone growth, nerve damage, or infection. These other options represent different pathological processes or conditions that do not typically feature the presence of a fluid-filled sac associated with ganglion cysts.