[Carcinoma inside of an amygdaloid cyst. Apropos of a case]

The authors report one case of tonsillar cyst with area of dysplasia in the epithelium, in situ carcinoma, and invasive carcinoma which are peculiar to branchiogenic carcinoma. A tonsillarectomy made ten month after the operation contradict this diagnosis. The criteria for making the diagnosis of branchiogenic carcinoma are discussed so as the clinical sensibility of this cysts. Present imagery is not able to assert the primarity of such lesion. Removing of the tonsil would be made systematically.