Predictive value of 18F-FDG PET/CT metabolic heterogeneity parameter combined with peritumoral adipose tissue abnormality and cN stage in perineural invasion of colorectal cancer: a retrospective analysis - Chen, Qiaoliang; Tan, Shuangxiu; Chen, Jing; Yin, Jiaxin; Sun, Qing; Liang, Di; Wang, Lian; Li, Aimei; He, Jian (Quantitative Imaging in Medicine and Surgery, 2025)