CT Nodule Enhancement

Figure 1. CT Nodule Enhancement Study

True negative examination in a 56-year-old woman with neck carcinoma

Axial CT image was obtained without contrast.

Figure 2.

Images at one minute following contrast injection,

Figure 3.

three minutes following contrast injection,

Figure 4.

and four minutes following contrast injection all fail to show more than 15 HU of enhancement, suggesting a benign diagnosis.

A tuberculous granuloma was found at biopsy.

Figure 5. Histology

This healed granuloma from another patient is the peripheral component of the Ghon complex of primary tuberculosis. The rounded blue area represents calcification, which, when more extensive, may show a laminar pattern on CT, suggesting a benign lesion.

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