Signet-ring cell mesothelioma is uncommon and only two case reports have been published on this mesothelioma variant, both of which were initially misdiagnosed as signet-ring cell carcinoma. Herein ...
Signet-ring cell carcinomas usually have some extracellular mucin production. Occasionally, mucin accumulates intracellularly in mucinous adenocarcinomas, resulting in signet-ring cell morphology.