letteratura: https://www.mdpi.com/1648-9144/60/12/2006#
Austrature: https://www.researchgate.net/publication/41849207_Ultrasound_and_Inflammatory_Bowel_Disease
halo sign: https://radiopaedia.org/articles/fat-halo-sign-inflammatory-bowel-disease
Survived Lung https://www.sciencedirect.com/science/article/abs/pii/S0301562920302088
Swinging Kidney https://journals.sagepub.com/doi/full/10.1177/87564793211073693
