ABSTRACT
The hysteroscope has become a standard part of gynecologists' armamentarium, and hysteroscopy is taught routinely in residency curriculums. In recent years, its use in gynecology has changed from a diagnostic tool only to an instrument for gynecologic operations. An electrolyte-free irrigation fluid is used for hysteroscopic surgery, and it has a possibility of substantial absorption of irrigation fluid. The absorption depends on the rate, volume and nature of the irrigation fluid. Fortunately, large-scale fluid absorption is rare but leads to symptoms severe enough to require intensive care. Several methods have been proposed to reduce the risk but none of them is capable of preventing the complication from fluid absorption. In this case, the patient had pulmonary interstitial edema with hyponatremia after hysteroscopic uterine septectomy but that had resolved without sequelae.