<prompt> Which one of the following imaging modalities is most sensitive for evaluation of extra- adrenal phaeochromocytoma.UltrasoundCTMRIMIBG scan  <response>: D i.e. MIBI Scan Pheochromocytoma arises from paraganglion cellsQ autonomic nervous system. M. C. site of origin is adrenal medullaQ M. C. extra-adrenal site is paraveebral sympathetic ganglion in organ of zuckerkandlQ near aoic bifurcation Investigation of choice for adrenal pheochromocytoma is CT ScanQ followed by MRI dt low cost Investigation of choice for locally recurrent, metastatic, Ectopic Extra - adrenal pheochromocytoma is metaiodobenzylaguanidine MIBG ScanQ using P23 or 1131. Sensitivity of imaging modalities 