Reporting rotator cuff tears on magnetic resonance arthrography using the Snyder’s arthroscopic classification

Table 2 Adaptation to magnetic resonance arthrography of arthroscopic Snyder’s classification of rotator cuff partial tears

Lesion's grade	Severity of partial tears (A or B lesion)
1	Subtle irregularities of the tendon surface with preserved thickness
2	Major irregularities of the tendon surface with preserved thickness
3	Lesions involve less than 50% of tendon diameter and lesion extension is less than 3 cm
4	Lesions involve more than 50% of tendon's diameter with an extension of more than 3 cm or the lesion involves two tendons

A: Articular side; B: Bursal side.