Malignant pheochromocytoma with negative biochemical markers: Is it time to reclassify pheochromocytomas?
Pheochromocytomas are catecholamine producing tumors of adrenal gland generally diagnosed by presence att nighthawk hotspot of these markers in urine or plasma.However, a few may be marker-negative and challenging for clinicians.Several reports of these marker-negative pheochromocytomas may warrant necessity for a new classification of these tumors