The Lothrop procedure resects the medial frontal sinus floor, superior nasal septum, and intersinus septum, creating a large frontonasal communication which is completely supported by bone. However, the external approach, which is not surrounded by bone, often allows medial collapse of soft tissue and stenosis of the frontonasal communication. We describe a modified transnasal endoscopic Lothrop procedure, using powered instrumentation for cases in which frontal recess exploration has failed to relieve obstruction of the frontal sinus.
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