Successful treatment of gastric adenocarcinoma in a Meckel's diverticulum with pemetrexed plus carboplatin.

A 42-year-old man was found to have an adenocarcinoma arising from ectopic gastric mucosa in Meckel's diverticulum, as diagnosed with surgical pathology. Recurrence was recognized with massive ascites at 1 year and 6 months after surgery. Chemotherapy in the first and second lines was not effective. In the third line of chemotherapy, pemetrexed and carboplatin were both administered and this resulted in a good response for massive ascites. This palliative therapy was effective and safe.