Large number of motor vehicle accidents and the more aggrresive surgical approaches to the skull base and intracranial diseases have increased the number of patients presenting with cerebrospinal fluid rhinorrhea. A greater majority of cerebrospinal fluid rhinorrhea is the result of an acute head injury, but the others are dut to the stereotaxic transsphenoidal approach to the sella turcica for pituitary tumors, defects in the base of skull produced as a result of intranasal operation or due to prolonged intracranial pressure, leading to thinning of the cribriform plate, e.g. hydrocephalus and intracranial tumors. The authors have recently experienced three cases of iatrogenic cerebrospinal fluid rhinorrhea which were repaired successfully with rhinologic approach. So, we represent the cases with review of the literatures.