Inclusion Criteria:  age between 30 and 65 years old patient treated by the digestive surgery department of Montpellier University Hospital for a benign or malignant tumor of the liver requiring surgical excision in contact with the diaphragm who agreed to participate in the BOTAN study (Approval Number assigned by the IRB of Montpellier : 2021_IRB-MTP_08-37) Non-smoker patient for more than 6 months patient clinically stable at the time of the study, ie not requiring any treatment  Exclusion Criteria:  Patients undergoing treatment with antibiotics or corticosteroids, or recently within the last 4 months Pregnant or breastfeeding woman. Patients with a body mass index > 30 Patients with any criteria that may in themselves impair respiratory muscle function such as chronic obstructive pulmonary disease, heart failure, systemic infection, neuromuscular pathology, psychiatric pathology or metabolic disorder. Patients with coagulopathy or thrombocytopenia.