Original articlePresence of the abducens nerve according to the type of Duane's retraction syndrome
Section snippets
Materials and methods
Twenty-one patients with the characteristic findings of DRS, such as abduction deficit or adduction deficit, upshoot, downshoot, fissure narrowing on adduction, and 2 patients (4 and 6 years old) with an abduction deficit and a mild degree of upshoot, downshoot, or fissure narrowing on adduction were recruited from March 2003 to March 2004. Sixteen patients with type 1 DRS, 2 patients with type 2 DRS, and 5 patients with type 3 DRS, based on Huber's classification,6 were prospectively included
Results
The abducens nerve on the affected side could not be observed using MRI in 18 (100%) of 18 eyes (16 patients) with type 1 DRS (Fig 1) and in 3 (60%) of 5 eyes (5 patients) with type 3 DRS. The abducens nerve on the affected side was observed in 2 (100%) of 2 eyes (2 patients) with type 2 DRS (Fig 2) and 2 (40%) of 5 eyes (5 patients) with type 3 DRS (Fig 3). Among the 5 abducens nerves visible on the affected side, 4 had a normal root exit from the pontomedullary junction, whereas 1 emerged
Discussion
This report describes the varying presence of the abducens nerve according to the type of DRS. In type 1 DRS, the abducens nerve was absent in all patients. Conversely, in type 2 DRS, the abducens nerve was present in all patients. In type 3 DRS, the abducens nerve was absent or present. Though the numbers of type 2 and type 3 patients were small, they are reasonable, considering the rarities of types 2 and 3 DRS. Moreover, because 100% accuracy was achieved in the control group, we believe our
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Manuscript no. 240297.
The authors have no financial interest regarding the subject matter in this article.