Basal Cell Carcinoma-Signet Ring Type. Ultrastructural Study

Abstract
Light microscopic examination of a [human] 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.