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Endoscopic Sinus Surgery with Iatrogenic Damage to Cribriform Plate. This medical illustration shows forceps inserted into the nasal cavity to cut away the ethmoid sinuses during an ethmoidectomy and sphenoidotomy. A normal anatomy drawing shows healthy sphenoid sinuses, cerebrospinal fluid, CSF, dura mater, and cribiform plate. The post-surgical condition indicates CSF leakage and a defect in the cribiform plate.