Which of the following disease is known as "Great Masquerader"?

Since Pheochromocytoma has a variable presentation it is known as "Great Masquerader". It presents as episodes of palpitations, headache and profuse sweating. Catecholamine crisis can lead to hea failure, pulmonary edema, arrhythmia and intracranial hemorrhage. Moreover paroxysms are precipitated by surgery, positional changes, exercise and urination leading to great diagnostic challenge.