Metabolic, hormonal profiles and comorbidities in pituitary Cushing's syndrome, adrenal Cushing's syndrome and mild autonomous cortisol secretion: a comparative study.

Purpose: Our study aimed to discern disparities in metabolic, hormonal profiles, and comorbidities among patients with pituitary Cushing (PC), adrenal Cushing (AC), and Mild autonomous cortisol secretion (MACS).

Methods: We conducted a retrospective analysis involving 76 patients diagnosed with PC ( = 26), AC ( = 21), and MACS ( = 29) at our clinic. We compared the groups' demographic data, clinical characteristics, biochemical profiles, hormonal analyses, and surgical interventions.

Results: No significant differences were noted in age, height, body mass index, or gender distribution among the groups, although a higher proportion of females was observed across all three groups. However, PC patients exhibited markedly elevated 24-hour urinary cortisol levels compared to AC and MACS patients. Furthermore, alanine aminotransferase, triglycerides, very low-density lipoprotein, insulin, and basal cortisol levels were significantly elevated in PC and AC cases compared to MACS cases. Interestingly, no significant differences were observed in terms of comorbidities among the groups.

Conclusion: Our findings suggest that urinary cortisol levels were significantly higher in the PC group than in the AC and MACS groups, potentially indicating that high-amplitude adrenocorticotropic hormone stimulation may lead to increased cortisol secretion in PC patients. The increased utilization of imaging methods has facilitated the earlier detection of adrenal incidentalomas, enabling the diagnosis of adrenal Cushing's cases with milder cortisol elevations. Additionally, the severity of disease symptoms worsens with increasing cortisol levels.Notably, moderate increases in cortisol are associated with heightened comorbidities, underscoring the importance of vigilant management in Cushing's syndrome patients. Despite a lower degree of hypercortisolism in MACS, there were no differences in comorbidities, suggesting that even mild cortisol secretion abnormalities are sufficient to establish the presence of comorbidities. Even moderate increases in cortisol levels can impact bone metabolism.