Pituitary adenomas are the most common cause of Cushing's syndrome, accounting for approximately 70% of cases.

Cushing's syndrome can cause a wide range of clinical manifestations, including central obesity, moon face, buffalo hump, striae, hirsutism, hypertension, diabetes mellitus, osteoporosis, muscle weakness, easy bruising, delayed wound healing, mood changes, and cognitive impairment.

The biochemical hallmark of Cushing's syndrome is increased cortisol levels.

The most common laboratory test used to diagnose Cushing's syndrome is the 24-hour urine free cortisol.

The treatment of choice for Cushing's syndrome caused by a pituitary adenoma is transsphenoidal surgery.

The treatment of choice for Cushing's syndrome caused by an adrenal adenoma is adrenalectomy.

The treatment of choice for Cushing's syndrome caused by ectopic ACTH production is medical therapy.

The most common medical therapy used to treat Cushing's syndrome is ketoconazole.

Cushing's syndrome can lead to a number of potential complications, including cardiovascular disease, stroke, diabetes mellitus, osteoporosis, infection, and psychiatric disorders.

The prognosis of Cushing's syndrome depends on a number of factors, including the underlying cause, the severity of the disease, and the timeliness of diagnosis and treatment.

Hyperthyroidism is not a clinical manifestation of Cushing's syndrome.

ACTH level is not a laboratory test used to diagnose Cushing's syndrome.

Chemotherapy is not a treatment option for Cushing's syndrome.

Hyperthyroidism is not a potential complication of Cushing's syndrome.

Patient's gender is not a factor that affects the prognosis of Cushing's syndrome.