Mucus producing adenopapillary carcinoma of minor salivary gland origin with signet ring cells and intracytoplasmic lumina. A light and electron microscopic study. - De Araujo,V.C.; De Sousa,S.O.; Lopes,E.A.; DeAraujo,N.S.; Sesso,A. (Arch Otorhinolaryngol, 1988)