PMC4802332_01
Axial and sagittal fat-saturated proton density images demonstrating diffuse increased SI of the proximal portion of the flexor digitorum profundus muscle and axial T1WI demonstrates decreased muscle bulk and a few streaks of high SI within the flexor digitorum profundus muscle. Both images denote mild atrophy.
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Magnetic resonance imaging (MRI) scans of the forearm revealed abnormal high signal intensity of the both the PQ and the radial FDP uscles on proton density fat-saturated images (Fig. 1) and mild atrophy represented by some fatty streaks on T1 weighted images (T1WI)(Fig. 2).
Intraoperative photograph showing compression of the median nerve by tendinous fascia off the deep head of pronator teres and the fibrous arch of the flexor digitorum superficialis proximal to it.
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Several tendinous fasciae and a tight fibrous arch of the flexor digitorum superficialis were also found to compress the median nerve at the level of the AIN branch (Fig. 3), which were surgically released.