A 10-year-old girl is brought to clinic for laboratory follow-up. Her mother was recently diagnosed with von Hippel-Lindau (VHL) disease, and the patient received genetic testing. Examination is unremarkable. Laboratory evaluation reveals a missense mutation in the VHL gene. Periodic surveillance with which of the following is most likely to be of benefit in this patient?

Bone marrow evaluation
Chest radiography
Colonoscopy
Echocardiograohy
Plasma metanephrines