What does it mean if a ganglion shows increased uptake on a scintigraphy?

Not much. There is some joint changes and bone inflemation were the ganglion cyst coming from.Good luck.
Depends on the scan. A lymph node can be seen on various types of scan. It can be the result of an extravasation at the site of radionuclide injection in the case of a bone scan or it can result from inflammation, infection or cancer in the case of pet scan with 18fdg or 67 gallium citrate. So according to the type of scan, visualization of lymph nodes can have a very different meaning..