A tumor in the adrenal region with two metastases in the liver was classified as poorly differentiated sarcoma on the base of extensive immunostainings (expression of vimentin, desmin, myogenin, and CD31, no expression of inhibin, melan A). Four years later in a second examination with molecular methods for a study of adrenal sarcomas, this diagnosis must be revised due to the lack of MDM-2 gene amplification and FKHR translocation which exclude sarcoma. Further immunostainings of many other parts of the tumor showed in one area more mature tumor tissue expressing synaptophysin, SF-1, and melan A. From these findings we classified an adrenal cortical cancer with predominant dedifferentiation into a sarcomatoid adrenal carcinoma. The properties of this very rare cancer type are presented and discussed.
Keywords: Adrenal carcinoma; Immunostaining; Molecular pathology; Sarcoma; Sarcomatoid carcinoma.