Can a ganglion cyst be removed arthroscopically?

Depends: It depends where the cyst is located. Most cysts are superficial and a small incision is needed. If it is deeper such as a baker cyst of the knee then scope can be used.

Yes: It depends on the site, but a skilled arthroscopist is typically well-trained in arthroscopic ganglion cyst excision. Complete excision is more important than technique, and obviously a complete open excision would be more ideal than an incomplete arthroscopic excision. A benefit of the arthroscopic approach is that the surgeon can "see" the stalk, which is paramount to minimize recurrence.