<s>[INST] my husband who is 47 had a CT scan which showed a dark spot on his kidney Is this usually always cancer? [/INST] Hello. Welcome to Chat Doctor. You will have to tell us the medical terminology mentioned in CT scan. There can be numerous causes... if the dark spot or description in your report signifies, hemorrhage, it is not related to cancer. These days, a guided FNAC under expert hands can accurately provide diagnosis even in deep internal organs like kidney. You can discuss the same possibility with your clinician and radiologist. Take care. </s>