Letter to the Editor on "Radiologic serosal invasion sign as a new criterion of T4a gastric cancer on computed tomography: diagnostic performance and prognostic significance in patients with advanced gastric cancer".

We provide commentary on the paper by You et al., which proposed the 'serosal invasion sign' as a new criterion for T4a gastric cancer on CT. We clarify the anatomical relationship between the perigastric vessels and the serosa, correcting for an anatomical oversight in the original figures.