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 Indian J Med Microbiol  
 

Figure 4 (A-G): Painful left anterolateral thigh mass in a 9-year-old boy. There was no history of trauma. Initial standard radiographs were normal. Anteroposterior radiograph (A) of the femur at day 8 shows unilamellar periosteal reaction (arrow). USG at day 15 (B) shows an intramuscular mass with a hypoechoic center (star) and hyperechoic periphery (arrow). Anteroposterior radiographs at day 15 (C) and day 23 (D) show de novo ossifications arranged along the muscle fiber axis (large arrows) and located around a central noncalcified area. At day 23, coronal T1W (E) and T2W (F) MRI images show the lesion with a hypointense rim (arrows). The T2W MRI also shows a central hyperintensity area and soft tissue edema surrounding the lesion (star). Axial contrast-enhanced T1W MRI (G) shows rim enhancement (arrowhead), indicating a zone phenomenon

Figure 4 (A-G): Painful left anterolateral thigh mass in a 9-year-old boy. There was no history of trauma. Initial standard radiographs were normal. Anteroposterior radiograph (A) of the femur at day 8 shows unilamellar periosteal reaction (arrow). USG at day 15 (B) shows an intramuscular mass with a hypoechoic center (star) and hyperechoic periphery (arrow). Anteroposterior radiographs at day 15 (C) and day 23 (D) show de novo ossifications arranged along the muscle fiber axis (large arrows) and located around a central noncalcified area. At day 23, coronal T1W (E) and T2W (F) MRI images show the lesion with a hypointense rim (arrows). The T2W MRI also shows a central hyperintensity area and soft tissue edema surrounding the lesion (star). Axial contrast-enhanced T1W MRI (G) shows rim enhancement (arrowhead), indicating a zone phenomenon