Diagnosis of renal cell carcinomas (RCC) subtypes on computed tomography (CT) and magnetic resonance imaging (MRI) is clinically important. There is increased evidence that confident imaging diagnosis is now possible while standardization of the protocols is still required. Fat-poor angiomyolipoma show homogeneously increased unenhanced attenuation, homogeneously low signal on T2-weighted MRI and apparent diffusion coefficient (ADC) map, may contain microscopic fat and are classically avidly enhancing. Papillary RCC are also typically hyperattenuating and of low signal on T2-weighted MRI and ADC map; however, their gradual progressive enhancement after intravenous administration of contrast material is a differentiating feature. Clear cell RCC are avidly enhancing and may show intracellular lipid; however, these tumors are heterogeneous and are of characteristically increased signal on T2-weighted MRI. Oncocytomas and chromophobe tumors (collectively oncocytic neoplasms) show intermediate imaging findings on CT and MRI and are the most difficult subtype to characterize accurately; however, both show intermediately increased signal on T2-weighted with more gradual enhancement compared to clear cell RCC. Chromophobe tumors tend to be more homogeneous compared to oncocytomas, which can be heterogeneous, but other described features (e.g. scar, segmental enhancement inversion) overlap considerably between tumors. Tumor grade is another important consideration in small solid renal masses with emerging studies on both CT and MRI suggesting that high grade tumors may be separated from lower grade disease based upon imaging features.

Though rare, severe hemoptysis (SH) is associated with a mortality rate exceeding 50% when not managed properly. Areas covered: This paper reviews the recent epidemiological data regarding SH, the role of multidetector computed tomography angiography (MDCTA), and fiberoptic bronchoscopy (FOB) in its management, as well as the value of current treatments. Expert commentary: MDCTA is becoming an essential modality, since it allows determining the location, etiology, and mechanism of the bleeding. FOB can be delayed, except when local control of bleeding is required. Emergency treatment relies on interventional radiology. Both bronchial and non-bronchial arteries should be explored during bronchial arteriography. Surgery must be considered in all operable patients if the cause of hemoptysis persists.

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