<prompt> Which one of the following imaging modalities is most sensitive for evaluation of extra-adrenal PheochromocytomaUltrasoundCTMRIMIBG scan  <response>: MIBG is taken up by catecholamine granules and is used mainly for localizing pheochromocytomas in the adrenal and in extra-adrenal sites and for the detection of metastasis. 