Abstract
The escape of large amounts of fluid from the nose following an injury of the head was first described by Bidloo in 1700. Eight months after the injury meningitis developed, and the patient died. The first description of this condition in the English language was published by Miller in 1826, but the term "cerebrospinal rhinorrhea" was first used by St. Clair Thompson in 1899. He described a case of cerebrospinal rhinorrhea of unknown cause. Of the 21 cases which he reported, 1 was traumatic. Johnson, in 1926, reported 21 cases, in 6 of which the condition was due to trauma. The causes of a fistula leading into the nasal cavity through which cerebrospinal fluid escapes are (a) a bony defect in the posterior wall of the frontal sinus with defect in the dura, (b) a defect in the cribriform plate of the ethmoid bone and (c) defects in the walls

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