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| Depending on the degree of pneumatization, agger nasi cells can be bounded anteriorly by the frontal process of the maxilla, anterolaterally by the nasal and lacrimal bones, posterolaterally by the lamina papyracea, superiorly by the frontal sinus, inferolaterally by the uncinate process, and posteriorly by the anterior ethmoid complex. The preferred location for the ostium created by DCR is through the lacrimal bone in the anterosuperior part of the lateral nasal wall. The convex anterior margin ascends to the lacrimal bone and in some patients to the skull base or the lamina papyracea, remaining in contact with the bony lateral nasal wall. |
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