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To analyze whether the presence of the abducens nerve might depend upon the ty pe of Duane’s retraction syndrome (DRS). Observational case series. Sixteen pat ients with type 1 DRS, 2 patients with type 2 DRS, and 5 patients with type 3 DR S. Ophthalmologic examination and thin-sectioned magnetic resonance imaging (MR I) at the brain stem level were performed in 23 DRS patients. To confirm the acc uracy of the procedure, we compared the results obtained with those of a control group of 30 individuals using the same technique. Examination of ductions and v ersions and the presence of the abducens nerve on MRI. The abducens nerve on the affected side could not be observed using MRI in 18 (100%) of 18 eyes (16 pati ents) with type 1 DRS and in 3 of 5 eyes with type 3 DRS. Conversely, the abduce ns nerve was observed in 2 of 2 eyes with type 2 DRS and 2 of 5 eyes with type 3 DRS. The abducens nerve was observed in 60 (100%) of 60 eyes screened as contr ols. The abducens nerve on the affected side was absent in type 1 DRS patients a nd some type 3 DRS patients, but present in type 2 DRS patients as well as in so me type 3 DRS patients. In terms of the presence or absence of the abducens nerv e, type 1 and type 2 DRS were homogenous, and type 3 DRS was heterogenous.
Six patients with type 1 DRS, 2 patients with type 2 DRS, and 5 patients with type 3 DR S . Ophthalmologic examination and thin-sectioned magnetic resonance imaging (MR I) at the brain stem level were performed in 23 individuals with DRS. To confirm the accracy of the procedure, we compared the results of those with a control group of 30 individuals using the same technique. Examination of ductions and v ersions and the presence of the abducens nerve on MRI. The abducens nerve on the affected side could not be observed using MRI in 18 (100%) of 18 eyes (16 pati ents) with type 1 DRS and in 3 of 5 eyes with type 3 DRS. Conversely, the abduce ns nerve was observed in 2 of 2 eyes with type 2 DRS and 2 of 5 eyes with type 3 DRS. The abducens nerve was observed in 60 (100%) of 60 eyes screened as contr ols. The abducens nerve on the affe cted side was absent in type 1 DRS patients a nd some type 3 DRS patients, but present in type 2 DRS patients as well as in so me type 3 DRS patients. In terms of the presence or absence of the abducens nerv e, type 1 and type 2 DRS were homogenous, and type 3 DRS was heterogenous.