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Four examples of enhancement patterns using a qualitative method: (a) No perfusion. The patient was a 79-year-old male with a squamous cell carcinoma. (b) Partial ring perfusion. The patient was a 66-year-old female with an adenocarcinoma. (c) Complete ring perfusion. The patient was a 67-year-old female with an adenocarcinoma. (d) Heterogeneous perfusion. The patient was a 78-year-old male with a squamous cell carcinoma.
