Figure 4. Bilateral negative fist sign after post ambulatory swollen hands (POTASH), which had been associated with running, has spontaneously resolved completely.

A negative fist sign is observed when the individual can make a tight fist after clenching the fingers into the ipsilateral palm. Within two hours after the patient stopped running, he could make a fist with his left (A) and right (B) hands. Photographs of the hands were taken 24 hours after the patient stopped running.