Light bulb sign (pheochromocytoma)

Last revised by Dr Daniel J Bell on 15 May 2021

The light bulb sign of an adrenal pheochromocytoma is an MRI feature of this tumor. It refers to marked hyperintensity on T2 weighted sequences, however, this finding is neither sensitive nor specific and pheochromocytomas are more often heterogeneous with intermediate or high T2 signal intensity.

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