ADH	Adrenal-dependent hypercortisolism
ACTH	Adrenocorticotropic hormone
CI	Confidence interval
CS	Cushing’s syndrome
F	Female
FRT	Fractionated radiotherapy
HPA	Hypothalamic–pituitary–adrenal
I	Intact
LA	Laparoscopic adrenalectomy
M	Male
MD	Mean difference
MST	Median survival time
NT	No treatment
OA	Open adrenalectomy
OR	Odds ratio
PDH	Pituitary-dependent hypercortisolism
PRISMA	Preferred Reporting Items for Systematic Reviews and Meta-Analyses
RCT	Randomized controlled trial
ROBINS-I	Risk Of Bias In Non-randomized Studies of Interventions
RT	Radiotherapy
SD	Standard deviation
SEM	Standard error of the mean
SRT	Stereotactic radiotherapy