Low minimum ADC values (p = 0.001), unfavorable tumor histopathology (p < 0.001) and the presence of microvascular invasion (p < 0.001) were risk factors for tumor recurrence, while ADC<sub>mean</sub> (p = 0.111) and DWI<sub>T/L</sub> (p = 0.093) showed no significant difference between the groups.
Maximum standardized uptake value (SUVmax) and ADC values were correlated with pathologic grade, extent of invasion, solid tumor size, and tumor cellularity.Mean solid tumor size (low: 1.7 ± 3.0 mm, indeterminate: 13.9 ± 14.2 mm, and high grade: 30.3 ± 13.5 mm) and SUVmax (low: 1.5 ± 0.2, indeterminate: 3.5 ± 2.5, and high grade: 15.3 ± 0) had a significant relationship with pathologic grade based on 95% confidence intervals (P = .01 and P < .01, respectively).
ADC values were significantly lower in patients with undifferentiated tumours, large tumour size, as with optic nerve and scleral invasion (all p < 0.05).