A young man developed pain in his right gluteall region, in the posterior aspect of the thigh and around the lateral and posterior aspect of the leg....

A young man developed pain in his right gluteall region, in the posterior aspect of the thigh and around the lateral and posterior aspect of the leg. On questioning he reported that the pain had radiated to the lateral aspect of the foot. Particularly arounf the lateral malleolus

Explain the diagnosis