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A 57-year-old female patient with breast cancer diagnosed as sarcoid reaction of mediastinal LNs. The total volume and attenuation of mediastinal and hilar LNs on CT images were quantitatively measured using the Image J program by multiplying the diameters of all LNs in all axial images by the slice thickness. An example of slices on Image J is shown. The measured total volume of LNs was 16903.5 mm3. CT = computed tomography, LNs = lymph nodes.
