Role of ¹⁸F-Fluorodeoxyglucose Positron Emission Tomography/Computed Tomography in the Diagnosis of Newly Found Suspected Malignant Solitary Pulmonary Lesions in Patients Who Have Received Curative Treatment for Colorectal Cancer

Figure 2

Solitary pulmonary lesions were visually classified into 5 levels according to the characteristics of their borders, as observed on noncontrast CT scans (slice thickness, 1.25 mm). The classification was performed by 3 senior physicians who reached a consensus for each patient. Representative lesions for levels 1–5 are shown. (a) A level 1 lesion with regular borders. (b) Level 2, (c) 3, (d) 4, and (e) 5 lesions with slight, median, slightly high, and high levels of lobulation and spiculation, respectively, and correspondingly ill-defined borders.

(a)

(b)

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(e)