Classification of nasopharyngeal carcinomas has undergone several changes in the past editions of the WHO classification. The 1991 edition separates nasopharyn-geal carcinoma into two subtypes, the keratinising and the non-keratinising carcinoma . The non-kerati-nising carcinomas have been further subdivided into undifferentiated and differentiated forms. This subdivision, however, is nowadays considered optional since their distinction is of no clinical or prognostic significance. Whether basaloid-squamous carcinoma merits separate recognition or merely represents a morphologic variant of non-keratinising carcinoma has not yet been clarified [7, 138, 159, 194].
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