Cushing's Syndrome – Differential Diagnosis	

No clinical features provide uniformly reliable differentiation between the causes of the syndrome, but unequivocal pigmentation, clinical diabetes mellitus, and  in Conn's Syndrome is strongly suggest the presence of ectopic ACTH secretion. Virilisation may be indicative of androgen secretion by an adrenal tumour. 

See later:
• Cushing's Syndrome – ACTH Test
• Cushing's Syndrome – Serum Cortisol Test
• Cushing's Syndrome – CRH Test
• Cushing's Syndrome – Metyrapone Test
• Cushing's Syndrome – Radiography
• Cushing's Syndrome – CT Scanning
• Cushing's Syndrome – Venous Catheterisation
• Cushing's Syndrome – Venous Sampling