LAUSR

Background To investigate the correlation between musculoskeletal mass and perfusion using quantitative computer tomography (QCT) and CT perfusion (CTP) in patients with gastrointestinal malignancy. Methods In this prospective study, 96 patients (mean age 66 years, range 25–90; 63.5% male) with gastrointestinal malignancy underwent QCT and CTP between May 2019 and February 2021. Bone mineral density (BMD) and body composition [perivertebral muscular mass index (PMI), skeletal muscular mass index (SMI) and muscular fat fraction] were evaluated through QCT. Musculoskeletal perfusion parameters were measured by CTP. Differences in these parameters between (or among) two (or three) groups (grouped by BMD, SMI, and TNM staging) were analyzed. Results There were significant differences in PMI and muscular fat fraction among normal ( n  = 30), osteopenia ( n  = 43), and osteoporosis ( n  = 23) groups (both P  < 0.001). Blood flow ( r  = 0.336, P  = 0.001; adjusted for age and gender, r = 0.383, P  < 0.001), blood volume ( r  = 0.238, P  = 0.011; adjusted for age and gender, r  = 0.329, P  = 0.001), and flow extraction product ( r  = 0.217, P  = 0.034; adjusted for age and gender, r  = 0.320, P  = 0.002) vaules of vertebral perfusion showed positive correlation with BMD. However, the relationships between PMI and perfusion parameters of perivertebral muscle were not significant. No significant differences were found in musculoskeletal mass and perfusion parameters between different TNM staging. Conclusions The changes of bone mass and perivertebral muscular mass in patients with gastrointestinal malignancy are synchronous. Decreased vertebral bone mass is accompanied with reduced perivertebral muscular mass, increased muscular fat, and decreased bone perfusion. However, the changes of perfusion in vertebra and perivertebral muscles are asynchronous. Musculoskeletal mass and perfusion have no correlation with TNM staging of the patients with gastrointestinal malignancy. Trial registration SHSY-IEC-4.1/20–242/01 (Registered 09–12-2020, Retrospectively registered).