Dehiscence of the lamina papyracea is an anomaly of the paranasal sinuses resulting in a defect of the medial orbital wall.
There is some speculation that it might be caused by a hyperaerated ethmoid 1.
Almost all patient tend to be asymptomatic, according to one study 2. Patients will have an absence of prior trauma.
CT / MRI
Dehiscence is usually characterized by protrusion of orbital fat through a defect in the anterior ethmoid bone. The posterior limit of the dehiscence tends to be always the basal lamella while the anterior limit can be varied.
On imaging consider
- sequelae of an old medial orbital blowout fracture.
Recognizing this has implications in planning sinus procedures such as functional endoscopic sinus surgery.
- 1. Moulin G, Dessi P, Chagnaud C, Bartoli JM, Vignoli P, Gaubert JY, Castro F, Delannoy L, Sibartie A. Dehiscence of the lamina papyracea of the ethmoid bone: CT findings. (1994) AJNR. American journal of neuroradiology. 15 (1): 151-3. Pubmed
- 2. Kitaguchi Y, Takahashi Y, Mupas-Uy J, Kakizaki H. Characteristics of Dehiscence of Lamina Papyracea Found on Computed Tomography Before Orbital and Endoscopic Endonasal Surgeries. (2016) The Journal of craniofacial surgery. 27 (7): e662-e665. doi:10.1097/SCS.0000000000003005 - Pubmed