Dehiscence of Lamina Papyracea a Normal Variation: A Case Report in Iran

The dehiscence of lamina papyracea (LP) is an anatomic variation of ethmoid bone that is important in endoscopic sinus surgery. There are two different cases without a history of trauma. Entrapment of fat was observed without the involvement of medial rectus muscle. The variations of paranasal sinuses are common, and certain types of them are very important; for instance, the position of LP, whether medial or lateral, or the dehiscence of LP therefore regarding the position of LP in sinus surgery can prevent complications of orbit. Awareness of dehiscence of LP before surgery is crucial for preventing orbital complications. The present study describes two cases with medial positions and dehiscence of LP.