Calcifications are a rare finding described in benign and malignant tumors located in any site of the body. Their presence in stomach and colon carcinomas is very rare. Most of the cases described are mucinous adenocarcinomas. We present the case of one patient with this disease studied with endoscopic ultrasonography. There were punctate calcifications in the submucosa layer that tended to take on a crown-like shape in the outer-most area, producing an acoustic shadow. The pathological study of the surgical specimen showed amorphic calcifications inside some mucin lakes. More cases need to be studied with this technique in order to define their endosonographic characteristics.