Background:severe preeclampsia (PET) is one of the hypertensive diseases of pregnancy associated with significant morbidity and mortality and require special monitoring, lung ultrasonography is a novel monitoring and diagnostic tools in intensive care and widely used nowadays with early detection of pulmonary oedema. Patients and Methods:this was a cross sectional study of 55 patients with severe preeclampsia,35 case with eclampsia and 60 healthy controls. Lung ultrasonography was done to detect B lines in 12 lung zone postoperatively in both cases and controls fluid input and output is encounted. Results:Median (Min- Max) of lung sonar was higher in severe PET than in controls p value = .0001. B lines were observed in 47.2% and 8.3% in eclampsia ,severe PET and controls respectively. There was highly statistically significant difference between cases and controls as regards input and output as ( P=.005), ( P=.003) respectively as input and output was higher in control group than cases group) While there was no statistical significance difference between cases and controls as regards net balance as (P=.09). complications occur in higher percentage in cases than control. Conclusions: Restrictedfluid policy is indicated with the finding of B pattern especially with higher lung ultrasound score. Early management in patients with high B line score (pulmonary congestion) even before development of clinical manifestations should be considered.