What is the medical term meaning cystic tumor that develops on a tendon?

The medical term for a cystic tumor that develops on a tendon is "ganglion." Ganglia are usually benign, fluid-filled swellings that commonly occur on the wrist or other areas where tendons move frequently. They can be associated with underlying joint or tendon problems, but often their exact cause is unknown. Treatment typically involves conservative measures like splinting, activity modification, and pain relievers. In some cases, surgical removal may be necessary if the ganglion causes significant pain or affects mobility.