Hi Ishyde

I could say that i have such similar experience.

As far as i know, Ultrasound is pretty inaccurate for diagnosing tumor malignancy/benignity so I supposed that a contrast CT scan was suggested in order to clear things up for a more proper diagnosis

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Also I could say that you shouldnt worry about the inclusion of Thorax CT-scan as I think it is a more standard procedure for kidney tumors regardless of whether they are cancerous or not.

Angiomyolipoma, the most common type of benign (non-cancerous) kidney tumor is often associated with a genetic condition known as Tuberous Scelorisis, specially in women. Such type of benign tumors would also cause fatty lesions and cysts on liver and lungs, so a Thorax Ct-Scan could also help rule out  such possibilities.

Hi ,I myself have a kidney cyst although I'm only at the stage where I've had 1 c.t scan and 2 ultra sound scan at the uss ,the urologist who conducted my ultra sound scan took picture and measured it . I didn't find out what size it is . But he said I need to come back for a contrast c.t scan . Now I'm not one to dawn on things unknown but like you I have been very worried  it could be cancer .I also have Gull stones which is absolute agony ..    hope you get good news at your results .I think that as being human and value your life it's very easy to get worried it's something it's not . I've told myself not to worry until I get the results .harder said than done ... so I know where your coming from with the worry side of things .