1. Signet ring cell carcinoma of prostate. Electron microscopic and immunohistosignet-ring cells stained positively %with chemical studies of 8 cases;Ro, J.Y.; Naggar, A.; Ayala, A.G.;Am J Surg Pathol; periodic acid Schiff with and without dias; tase 3 Ming SC. Tumors of the esophagus and stomach. Atlas of digestion. Electromicroscopically, our findiings showed that the signet-ring cell appearance was AturmmoerdpaFtohrocleosgyIn(s2tnitduSteeroifesPFaatshcoilcolegy7) 1.9W7a3s: 2h5i3n-g5t.on, DC: 4 Cormier WJ,1988