The 'HYP'OP' cohort comprises patients who underwent endoscopic endonasal surgery (EES) for pituitary adenoma during a 10-year period spanning from January 2012 to June 2022 at the Nancy University Hospital. Post-operative hospitalization in our endocrinology department is part of the standard care protocol, which also includes a systematic reevaluation 4 -6 months following the surgical intervention.

Risk factors associated with complications arising from surgery, specifically targeting the incidence of de-novo, clinically significant pituitary insufficiencies

Patients were stratified into groups based on surgical indications. The first group consisted of non-secreting, non-compressive adenomas without preoperative insufficiency or hyperprolactinemia, with success defined as absence of new insufficiency and no MRI-detected residual tissue. The second group was similar to the first but included disconnection hyperprolactinemia, and success was defined by the absence of new insufficiency and hyperprolactinemia regression. The third group involved non-secreting adenomas with at least one preoperative axis deficiency, irrespective of hyperprolactinemia, with success defined as restoration of at least one deficient axis without new insufficiency. The fourth group included secreting adenomas, with success defined as hypersecretion regression. The fifth group involved adenomas operated on for their compressive effect on the optic pathways, with or without hyperprolactinemia, and success was defined as no compression observed on follow-up MRI.

Patients were stratified into four groups using the same criteria as outlined in Outcome 3.