Seo I S, Warner T F, Priest J B
J Cutan Pathol. 1979 Apr;6(2):101-7. doi: 10.1111/j.1600-0560.1979.tb01110.x.
Light microscopic examination of a basalioma (basal cell carcinoma) revealed unusual keratinizing cells resembling signet ring cells with pink cytoplasmic inclusions. Ultrastructurally the inclusions consisted of filamentous masses encircled by abundant tonofilaments giving a striking picture of abnormal individual tumor cell keratinization.