Thank you for asking Healthcare majic. My name is Dr Ehsan Ullah & I have gone through your query. Lets split your question in two parts A). your ultrasound report shows fullness in the pelvicalyces fullness in the pelvicalyces (upper end of the urine drainage system, for the both kidney) means there is dilatation of the portion of kidney which collects urine and this happens due to obstruction of ureteropelvic junction... because of this there is stasis of some urine which causes pressure effect and pain. There is a list of causes leading to such condition like kidney stones especially in the ureteopelvic junction / ureter trauma Infections (Urinary tract infections) Pregnancy Enlarged prostate (Non Cancerous) Tissue scarring (from previous surgery) And Lesions / mass (Tumor) which is causing such symptoms / effects The treatment of this condition is Cause directed ... your physician will do your physical examination after relevant history . will do some Labs including Blood (kidney function tests) and Urine analysis and Radiological in the form of X-rays (KUB/IVU) , Ultrasound , CT Scan (Non Contrast) & MRI. Once the physician has searched the cause then treatment is cause directed B) you mentioned that Left ureter could not be visualised due to overlying intestinal gas and hence of left ureteric stone cannot be ruled out . it simply means that your left urine tract which brings urine from kidney to the urinary bladder could not be seen due to interference of the Gas shadows in between so radiologist is not sure fully about the absence of stone in this mentioned region. You should visit your physician which may do further work up for cause of this condition may refer you to urologist for further work up (Dependig upon your symptoms) to treat this condition timely . Hope this may help you. Let me know if anything not clear. Thanks.