Two Cases of Pheochromocytoma Diagnosed Histopathologically as Mixed Neuroendocrine-Neural Tumor.

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Abstract
We treated two rare cases of pheochromocytoma which were histopathologically diagnosed as mixed neuroendocrine-neural tumor (MNNT): a 35-year-old male patient associated with ganglioneuroblastoma and cutaneous neurofibromatosis and a 42-year-old male patient with ganglioneuroma. Both patients showed typical clinical manifestations of pheochromocytoma without any familial traits. Although each of the diseases has its own entity and clinical features, these tumors are all derived from the neural crest tissues. The tumorigenesis of MNNT is still unknown. Here, a brief review of the recent literature on this subject is discussed.

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