Ganglion - cystic formation in the tissue surrounding the joint bag or the tendon sheaths. It is located more often on the back surface, less often on the palmar surface of the wrist, in the wrist area, on the back surface of the foot. Ganglion has, as a rule, distinct contours, its dimensions are from 0.5 to 5 -6 cm in diameter. The ganglion cavity contains a gelatinous homogeneous mass. The patient may complain about a cosmetic defect, sometimes on aching or bursting pain in the ganglion area after physical exertion. Treatment operative. Relapses are possible.