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Click 21 year old male with progressive right upper limb atrophy secondary to Hirayama disease. Postcontrast axial T1WI images without fat suppression and in flexion. Parameters- TR: 647ms, TE: 12ms, Slice thickness: 4 mm, Field strength: 1,5T, gadolinium dose 0.1 mmol/kg.

Click 21 year old male with progressive right upper limb atrophy secondary to Hirayama disease. Flexion sagittal T2WI images. Parameters- TR: 4000ms, TE: 115ms, Slice thickness: 3 mm, Field strength: 1,5T.

Click 21 year old male with progressive right upper limb atrophy secondary to Hirayama disease. Flexion postcontrast sagittal images with fat supression T1WI. Parameters- TR: 647ms, TE: 12ms, Slice thickness: 4 mm, Field strength: 1,5T, fat suppression, gadolinium dose 0.1 mmol/kg.

Click 21 year old male with progressive right upper limb atrophy secondary to Hirayama disease. Neutral neck position MR images. Sagittal T2WI. Parameters- TR: 4000ms, TE: 115ms, Slice thickness: 3 mm, Field strength: 1,5T.

Click 21 year old male with progressive right upper limb atrophy secondary to Hirayama disease. Neutral neck position MR images. Axial T2WI. Parameters- TR: 4000ms, TE: 115ms, Slice thickness: 3 mm, Field strength: 1,5T.

Click 33 year old male with right upper limb weakness and atrophy secondary to Hirayama disease. Flexion sagittal T2WI images. Parameters- TR: 4000ms, TE: 115ms, Slice thickness: 3 mm, Field strength: 1,5T.

Click 33 year old male with right upper limb weakness and atrophy secondary to Hirayama disease. Flexion sagittal postcontrast T1WI with fat supression. Parameters- TR: 647ms, TE: 12ms, fat suppression, Slice thickness: 1 mm, Field strength: 1,5T, gadolinium dose 0.1 mmol/kg.

Click 33 year old male with right upper limb weakness and atrophy secondary to Hirayama disease. Flexion axial postcontrast T1WI images. Parameters- TR: 647ms, TE: 12ms, Slice thickness: 4 mm, Field strength: 1,5T, gadolinium dose 0.1 mmol/kg.

Click 33 year old male with right upper limb weakness and atrophy secondary to Hirayama disease. Neutral position Axial T2WI images. Parameters- TR: 4000ms, TE: 115ms, Slice thickness: 2 mm, Field strength: 1,5T.

Click 33 year old male with right upper limb weakness and atrophy secondary to Hirayama disease. Neutral position Sagital T2WI images. Parameters- TR: 4000ms, TE: 115ms, Slice thickness: 3 mm, Field strength: 1,5T.