[Value of MRI in diagnosis of obstetrical brachial plexus palsy pre-ganglionic injury].
OBJECTIVE
To evaluate the value of MRI in diagnosis of obstetrical brachial plexus palsy pre-ganglionic injury.


METHODS
From November 2006 to February 2008, 10 patients with obstetrical brachial plexus palsy were treated, 8 males and 2 females, aged from 2 months to 3 years (11.4 months on average). There were 7 cases of left side and 3 of right side. According to Tassin classification, 2 cases were type II, 6 type III and 2 type IV. All patients were performed MRI examinations before the operation, whose results were compared with those of exploration during the operation.


RESULTS
MRI examinations showed 1 patient was normal and 9 patients had post-traumatic spinalmeningolcele. The 6 patients had displacement of spinal cord (4 towards the healthy side and 2 towards the sick side), 6 had deformity of spinal cord, and 2 had avulsed nerve root thickening. MRI detected 19 nerve roots were positive, 16 were true positive and 3 false positive in surgical exploration. MRI detected 6 nerve roots were negative, 4 were true negative and 2 false negative in surgical exploration. The sensitivity, specificity and accuracy of MRI in diagnosis of obstetrical brachial plexus palsy pre-ganglionic injury were 84.2%, 80.0% and 83.3%, respectively. There were significant differences in the results by preoperative MRI examinations and by exploration during the operation (P < 0.05).


CONCLUSIONS
MRI can show pre-ganglionic injury of brachial plexus of the patients with obstetrical brachial plexus palsy and can supply references for early diagnosis and operation time. MRI can be routinely conducted as a preoperative examination.
Qin
Bengang
B
Orthopaedic Trauma & Microsurgery, First Affiliated Hospital, Sun Yat-sen University, Guangzhou Guangdong 510080, PR China.
Gu
Liqiang
L
Liu
Xiaolin
X
Zhang
Zhongwei
Z
Xiang
Jianping
J
Wang
Honggang
H
Fu
Guo
G
D001917:Brachial Plexus / Q000293:injuries*; D020516:Brachial Plexus Neuropathies / Q000145:classification / Q000175:diagnosis* / Q000209:etiology; D002675:Child, Preschool; D005260:Female; D006801:Humans; D007223:Infant; D008279:Magnetic Resonance Imaging; D008297:Male; D012189:Retrospective Studies