The objective is to discuss the terminology, differential diagnoses, and clinical and structural significance of MRI-detected subchondral bone marrow lesions (BML) of osteoarthritic joints. Subchondral BMLs are a hallmark of knee osteoarthritis (OA) on MRI, but are also regularly seen in hip OA and in non-weight bearing de- The staging of kidney tumours includes a systematic approach to recognise and describe the local, regional, and distant extent of tumour burden. Staging results determine therapeutic approach, success of individual treatments, and prognosis of individual patients. Evolving diagnostic, therapeutic, and prognostic experience continues to re-define staging categories. In renal cell carcinoma (RCC), the Robson classification has been replaced by the TNM classification. Since 2002, the TNM classification includes RCC of 4 cm or less in stage T1a, since recent surgical experience suggests that partial nephrectomy (nephron-sparing surgery) can be curative, while it preserves excretory capacity. Since surgery is currently the only means of curative treatment, lymph node (N-) or distant metastatic (M-) extent of RCC is associated with unfavourable prognosis. However, new therapeutic concepts involving tumour anti-angioneogenesis factors or multi-kinase inhibitors demonstrate promising effects on tumour volume or tumour viability. Staging and follow-up of RCC may involve various imaging modalities. However, the increase in speed and range of both CT and MRI suggests that these modalities may soon limit or obviate the need for other imaging modalities in the staging of renal tumours.