We present a new complication: Transient pupillary dilatation in an eye that sustained a posterior orbital floor blow-out fracture. By reviewing the neural pathways involved with pupillary motor function, we surmise the causes of this complication to include trauma to the ciliary ganglion, short ciliary nerves, or the parasympathetic motor root. This type of injury has only recently been reported in the ophthalmologic literature, and has not, prior to this report, been included in the otolaryngologic literature.
