MR urography has been utilised to evaluate entire urinary system with advantage of not using ionizing radiation. Differentiate between physiological hydronephrosis from pathological is main concern in pregnant patients. Early identification of hydronephrosis in cases of ca cervix is required for better prognosis. The present study was planned at Department of Obstetrics and Gynaecology, Rajendra Institute of Medical Sciences, Ranchi. Total 50 females were enrolled in the present study. The enrolled patients were diagnosed with the hydronephrosis pre detected on the USG method. The study was performed using GE 1.5 Tesla 16 channel MRI machine. MR Urography delivered highest accuracy to demonstrate the cause, level and degree of obstruction and hydroureteronephrosis. MRU provided Information about structure, function and integrity of the urinary tract, along with identification of neoplasm and its involvement in adjacent structures. So, MRU is a better modality for evaluation of malignant as well as benign causes of obstruction due to its multi planar capability and superior soft tissue contrast. Thus, in patients with clinical features of Hydronephrosis, screening should be done with trans abdominal sonography which can detect level of hydronephrosis and any abnormality if present.