Table 1.

Summary of included studies.

	Study Design	Subject Features	Postganglionic Lesions	Age	MRI Field Intensity	MRI Sequences Employed	MRI Timing	Standard of Reference	Level of Evidence	Main Conclusion
Acharya, 2019 [16]	Prospective	35 patients with traumatic brachial plexus injuries	Eight surgically demonstrated postganglionic lesions	Patients under the age of 60	1.5 T	T1-T2-T2 weighted 3D neurography-T2 spin echo- short-tau inversion recovery (STIR)	At least 3 weeks after injury	Surgery	2b	Magnetic resonance imaging (MRI) is a useful tool in the diagnosis of brachial plexus injuries.
Zhang, 2018 [17]	Prospective	28 patients with traumatic brachial plexus injuries	23 surgically demonstrated postganglionic lesions, in 12 patients	Mean age: 27.2	3 T	T1-T2-STIR- balance FFE- diffusion-weighted imaging with background signal suppression (DWIBS)	Not reported	Surgery	2b	MRI is a valuable diagnostic tool for brachial plexus lesions, especially if balance-FFE, STIR, and DWIBS sequences are performed.
Caporrino, 2014 [18]	Prospective	34 patients with traumatic plexus injuries	Not reported	Mean age: 29.8	1.5 T	Not reported	2–3 months after injury	Surgery	2b	MRI showed poor diagnostic performance in identifying brachial plexus lesions compared to physical examination. Notwithstanding, it is reasonable to think that the combination of physical examination and MRI could provide the best diagnostic accuracy.
Gad, 2020 [15]	Prospective	22 patients with traumatic brachial plexus injuries	18 surgically demonstrated postganglionic lesions	Mean age: 26.3	1.5 T	T1, STIR, T2, T2-STIR, and DWIBS	Not reported	Surgery	2b	“MRI is the imaging modality of choice in the examination of traumatic and obstetric brachial plexus injuries; it is safe and non-invasive, having the multiplanar capability and better soft tissue characterization”.