CT pattern of asymmetric contrast enhancing of the eye muscles in dogs with different position of the eyeballs

Abstract

The main aim of the study was to determine the cause of the asymmetric contrast enhancing of the eye muscles in dogs during CT. A group of 200 dogs with asymmetric contrast enhancing of the medial and lateral rectus muscles of the eye was formed. The research showed that regardless of the presence or absence of extracranial pathologies, provided there was no extensive invasion of those into the retrobulbar space, the asymmetric staining of eye muscles is associated with the position of eyeballs. With the eyeball turned laterally, the lateral rectus muscle acquires a more hyperdensive patter, with the eyeball turned medially, the medial rectus and oblique dorsal muscule acquires a more hyperdensive patter. There was not a single case when the difference in staining of the rectus muscles would not correspond to the position of eyeballs. No other reasons that could convincingly explain the pattern of asymmetric staining of eye muscles in dogs were found. This study is the first description of the pattern of asymmetric eye muscle contrast enhancing in dogs on CT.