in tumors containing malignant squamous epithelium ( adenoacanthoma , adenosquamous carcinoma , or pure squamous carcinoma ) there is a range of such lesions , and since many of them appear to be derived from follicular epithelium , it is most likely that squamous metaplasia which has undergone malignant transformation has occurred in these neoplasms .
C0334393
adenoacanthoma
C0014609
epithelium