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No, ganglion cysts are not dangerous at all. (I have a ganglion cyst in my wrist).
The plural of ganglion is ganglia or ganglions.
Stellate ganglion: (neuroscience) The ganglion formed by the fusion of the inferior cervical and the first thoracic sympathetic ganglions.
Read more: cervicothoracic-ganglion
medical term: Ganglion Cyst