Increased MR signal intensity in the pronator quadratus muscle: Does it always indicate anterior interosseous neuropathy?
OBJECTIVE
The objective of this study was to assess the prevalence of increased signal intensity in the pronator quadratus in the general patient population. Using region-of-interest measurements, we measured the signal intensity of the pronator quadratus and of an adjacent flexor muscle. In addition, we performed independent subjective assessments of the pronator quadratus.


CONCLUSIONS
Increased signal intensity in the pronator quadratus is a frequent normal finding of unclear etiology and is not related to disease. Familiarity with this normal phenomenon is important to avoid overdiagnosis of denervation due to anterior interosseous nerve entrapment.
Gyftopoulos
Soterios
S
Department of Radiology, New York University Hospital for Joint Diseases, NY 10003, USA. soterios20@gmail.com
Rosenberg
Zehava Sadka
ZS
Petchprapa
Catherine
C
D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002648:Child; D005260:Female; D005542:Forearm / Q000294:innervation*; D006801:Humans; D016018:Least-Squares Analysis; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D008875:Middle Aged; D018482:Muscle, Skeletal / Q000294:innervation*; D009408:Nerve Compression Syndromes / Q000175:diagnosis; D012189:Retrospective Studies; D018709:Statistics, Nonparametric