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Unidimensional and bidimensional tumor measurements. CT scan of the chest in a 53-year-woman with stage IV adenocarcinoma of the lung depicts a lesion in the left upper lobe measuring 2.2 × 1.7 cm. With WHO criteria, the measurement of the lesion would be 3.7 cm2 (a product of 2.2 cm and 1.7 cm). The RECIST guideline uses the longest diameter of the lesion, which is 2.2 cm for this lesion.
