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  Indian J Med Microbiol
 

Figure 1: A 24-year-old male patient with bilateral Ficat Stage III femoral head avascular necrosis (a) Coronal positron emission tomography, (d) Axial positron emission tomography, (f) Fused axial positron emission tomography/computed tomography images show photopenic areas (arrows) in the antero-superior regions of both femoral heads, corresponding to subchondral cysts surrounded by sclerosis on computed tomography (b and e) and decreased signal intensity on T2 weighted magnetic resonance (c). The photopenic areas are bordered by increased tracer uptake corresponding to bone marrow edema on magnetic resonance imaging. Note is also made of bilateral joint effusion, double-line sign in the right femoral head and rim sign in the left femoral head on magnetic resonance imaging (c)

Figure 1: A 24-year-old male patient with bilateral Ficat Stage III femoral head avascular necrosis (a) Coronal positron emission tomography, (d) Axial positron emission tomography, (f) Fused axial positron emission tomography/computed tomography images show photopenic areas (arrows) in the antero-superior regions of both femoral heads, corresponding to subchondral cysts surrounded by sclerosis on computed tomography (b and e) and decreased signal intensity on T2 weighted magnetic resonance (c). The photopenic areas are bordered by increased tracer uptake corresponding to bone marrow edema on magnetic resonance imaging. Note is also made of bilateral joint effusion, double-line sign in the right femoral head and rim sign in the left femoral head on magnetic resonance imaging (c)