Mucinous adenocarcinoma is a malignant tumor that produces abundant mucin (a thick, slippery substance). It can occur in various organs, with common sites including the colon, pancreas, and appendix. On ultrasound, mucinous adenocarcinomas appear as solid masses that may contain cystic or complex areas. Peritoneal mucinosis, an advanced form of appendiceal mucinous neoplasm with spread to the peritoneal surface, creates a distinctive appearance with areas of ascites and thickened peritoneal nodularity. These tumors are often diagnosed at an advanced stage because they may not cause symptoms until they have grown substantially. Ultrasound may detect the primary tumor and associated fluid collections but is typically supplemented by CT for staging.
Sonography Term