Primary serous carcinoma (psammocarcinoma)

This peritoneal tumor is from a 37-year-old female with a history of Stage 3A primary peritoneal carcinoma diagnosed 6 years previously. Serous carcinoma is a high-grade tumor that usually behaves aggressively.  However, psammocarcinoma, this type of serous carcinoma, is the one variant that is considered low-grade and patients generally do very well. Note the numerous psammoma bodies in the photos.

Contributed by Dr. Michele Lomme