Bone Scintigraphy Hot-spot in Projection to Rib and Kidney: Role of Single Photon Emission Computer Tomography/computer Tomography in Distinguishing a Urine Collection in Renal Calyx from a Metastasis to Rib
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Abstract
On planar bone scintigrams, activity enhancement foci in projection to kidney and lower ribs can arise from the kidney, or from bone lesions. A differentiation based only on the exact location and shape of the hot spot can sometimes be misleading, resulting in a false qualification of a rib metastatic lesion as urine collection in the kidney or opposite. The authors illustrate the problem with three cases: In two patients, such a hot spot appeared to be the solitary metastatic focus; in one, highly suggestive for solitary metastatic focus, it was proven to be a urine collection.
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