Primary mediastinal adenocarcinoma is rare, but its originating from a calcified nodule is even more unusual. We present herein a 55-year-old female with a superior mediastinal mass, first discovered 2 years prior that changed dramatically from its original appearance as a calcified nodule. The mass was completely resected, and histopathological examination revealed a primary adenocarcinoma. The patient has been disease-free for over 13 months since surgery. To the best of our knowledge, this is the first reported case of mediastinal adenocarcinoma to demonstrate such a surprising course of development.
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