26years old military man after walking for 36 km he suffered from pain in the left thigh and did AP & Lateral x-ray on the hip and thigh and where normal

26years old military man after walking for 36 km he suffered from pain in the left thigh and did AP & Lateral x-ray on the hip and thigh and where normal what is the common missed diagnosis?
A, quadriceps ms rupture
b. stress fracture
c, osteosarcoma
d. infection
(b)