<prompt> Investigation useful for detecting extra adrenal phecochromocytoma-USGCCTT2-weighted MRI with gadolinium contrastMIBG  <response>: T2 weighted MRI with gadolinium contrast is optional for detecting pheochromocytoma and is somewhat better than CT for imaging extra adrenal pheochromocytoma and paragangliomas Ref Harrison 17 pg 2271 