The first case Left hip knee pain with coronal MRI → T1 ,T2,STIR I saw bright signal in STIR in the head of the left femur

The first case Left hip knee pain with coronal MRI → T1 ,T2,STIR I saw bright signal in STIR in the head of the left femur and TI seem normal choices are:
a- avascular necrosis.
b- stress fracture.