PET Detection of Malignancy

area

Figure 1. CT of Malignant Lesion

Axial CT shows a large, low attenuation mass in the right upper lobe, consistent with malignancy. The generalized low attenuation suggests extensive necrosis. A rounded area of increased attenuation posteriorly corresponds to the viable tumor shown below.

Find the area of increased attenuation.

tumor

Figure 2. PET Detection of Malignancy

Axial PET scan shows the right upper lobe lesion, and reveals the metabolically active neoplastic cells forming part of the margin of the mass. The photopenic area of the mass reflects necrosis, in which metabolically active tissue is absent.

Outline the mass.

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Area of increased attenuation

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Tumor mass

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