Feroz Hussain1, Mir Alam Siddique2
A 45 year old lady presented with spontaneous onset CSF rhinorrhoea. There was no history of any head injury, nasal surgery or past history of any intra-cranial tumour. Clinical procedures like CSF analysis and CT brain were done and was diagnosed as a case with keros type 3 olfactory fossa with a small hole in right cribriform plate. Later MR cisternography was performed for confirmation. Olfactory fossa is a variable depression in the cribriform plate that is bounded medially by the perpendicular plate of ethmoid and laterally by the lateral lamella. It contain olfactory nerves and a small artery.
