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Figure 11: Posterior interosseous nerve entrapment at the level of supinator muscle (supinator syndrome). (a and b) Clinical photographs demonstrating finger drop and marked decrease in the bulk of muscles on the posterior aspect of left forearm (as compared to right forearm). (c) SE T1 W image showing marked atrophy of posterior compartment muscles with fatty infiltration (arrow). (d and e) TSE T2W axial fat suppressed images showing thickening and abnormal T2 hyperintensity in the posterior interosseous nerve (arrow) while coursing through the supinator muscle. (f) Coronal reformatted image of GRE 3D PD VISTA showing thickening and altered signal intensity of the posterior interosseous while coursing between the two heads of supinator muscle (arrow). (g and h) Sonograms, axial and longitudinal images, showing marked thickening of the posterior interosseous nerve before entering the supinator muscle with sudden change in caliber after entering the supinator muscle suggestive of the supinator syndrome

Figure 11: Posterior interosseous nerve entrapment at the level of supinator muscle (supinator syndrome). (a and b) Clinical photographs demonstrating finger drop and marked decrease in the bulk of muscles on the posterior aspect of left forearm (as compared to right forearm). (c) SE T1 W image showing marked atrophy of posterior compartment muscles with fatty infiltration (arrow). (d and e) TSE T2W axial fat suppressed images showing thickening and abnormal T2 hyperintensity in the posterior interosseous nerve (arrow) while coursing through the supinator muscle. (f) Coronal reformatted image of GRE 3D PD VISTA showing thickening and altered signal intensity of the posterior interosseous while coursing between the two heads of supinator muscle (arrow). (g and h) Sonograms, axial and longitudinal images, showing marked thickening of the posterior interosseous nerve before entering the supinator muscle with sudden change in caliber after entering the supinator muscle suggestive of the supinator syndrome