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MBBS QUESTION #10172
Question 1
A patient with a base-of-skull fracture develops clear watery discharge from the nose (CSF rhinorrhea) that increases on bending forward. This is most likely due to fracture of which bone, given its perforations for olfactory nerve fibers?
  • Cribriform plate of the ethmoid bone✔️
  • Petrous part of the temporal bone
  • Body of the sphenoid bone
  • Squamous part of the occipital bone
Correct Answer Explanation
The cribriform plate is thin and perforated by numerous olfactory nerve filaments, making it vulnerable to fracture in anterior cranial fossa trauma, with resultant dural tearing and CSF rhinorrhea (often with anosmia).