A 32-year-old woman complains of general weakness, headache, excess body weight, pain in her bones, and irregular menstrual cycle. Objectively, her skin is dry and cyanotic Purple-cyanotic stretch marks are observed in the area of her abdomen, shoulders, and thighs. Fat deposition is mainly observed on the face, neck, and trunk. Blood pressure 165/100 mm Hg. Blood testing revealed glucose of 72 mmol/L and elevated ACTH levels. X-ray of the bones revealed signs of osteoporosis. What is the most likely diagnosis in this case?