RCC?

When it's RCC, how is that described on your reports? Mine MRI said solid cystic process 1 cm, suspicious for primary neoplastic process. Pet scan after 4 months said: sharply limited solitary focal lesion of heterodense structure with more pronounced imbibition in the arterial phase, 1,3 cm, 136 hu. Is it possible to not be malignant? I have a lot of symptoms, that's why I had MRI and pet scan (weight loss, back pain, abdominal pain and diarrhoea, etc.)