Hypertensive crisis:
α blockade with phenoxybenzamine or phentolamine acutely
Phentolamine: 5mg IM/IV q2-4h PRN
Nitroprusside
Nicardipine
Beta blockade can be started 2 days later
If beta blockade started before alpha blockers, unopposed alpha activity can precipitate hypertensive emergency
Eventual surgical resection of tumor
α blockade with phenoxybenzamine or phentolamine acutely
Phentolamine: 5mg IM/IV q2-4h PRN
Nitroprusside
Nicardipine
Phentolamine: 5mg IM/IV q2-4h PRN
If beta blockade started before alpha blockers, unopposed alpha activity can precipitate hypertensive emergency
Pheochromocytoma
Hypertensive emergency
Wilms' tumor
Stroke
Neuroblastoma 
Sympathetic crashing acute pulmonary edema
Syndrome of inappropriate antidiuretic hormone secretion
Ischemic stroke