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Adenoid cystic carcinoma (AdCC) is a distinct type of carcinoma, and cytological examination has been recognized as a useful tool in its diagnosis. Dedifferentiation is defined as the abrupt transformation of a low‐grade tumor into a tumor with high‐grade components. Albeit extremely rare, dedifferentiated AdCC has been reported: however, the cytological features of this tumor have not been documented...
Dedifferentiated adenoid cystic carcinoma is an extremely rare and highly aggressive tumor. We describe the first reported case of dedifferentiated adenoid cystic carcinoma of the trachea and analyze the expression profiles of mammalian target of rapamycin pathway proteins. A 66-year-old Japanese man was incidentally found to have stenosis of the trachea, and a bronchial biopsy revealed low-grade...
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