[Dehiscence of the lamina papyracea].

We report the case of a 35 year old patient presenting with acute onset of right periocular pain with palpebral edema due to nose blowing with absence of trauma. Early assessment showed periorbital emphysema without ophthalmological involvement, normal pupillary light reflex and visual acuity. Computerized tomography (CT) scan of facial and orbital bones objectified right pneumo-orbita with orbital fat herniation via a partial agenesis of the lamina papyracea, without muscle incarceration. Emphysema gradually reduced after two weeks by applying pressure dressing associated with broad spectrum antibiotic therapy as well as following the rules for cleanliness (avoiding closed glottis efforts, nose blowing…). Pneumo-orbita is defined by the presence of orbital air. It is mainly caused by a trauma but few cases of spontaneous dehiscence have been reported. The opening of the lamina papyracea, acting as an antireflux valve, prevents air outlet. CT scan is essential to confirm the diagnosis. It most often has a spontaneous resolution but the presence of hyperpression, that can be responsible for ischemic optic neuropathy or occlusion of the central artery of the retina, require a rigorous monitoring in order to implement possible urgent decompressive intervention.