Figure 20. Perfusion-CT of a 51-year-old patient with lip carcinoma and newly diagnosed induration of the anterior floor of the mouth.

a) Axial contrast-enhanced CT demonstrates discrete asymmetry and mild contrast enhancement on the left side.

b) PCT demonstrates increased blood volume,

c) increased blood flow

d) and increased permeability surface product indicating malignancy. Metastasis was confirmed by histology.