The lesion presented here was observed as an incidental finding in an approximately 4-month-old female transgenic mouse from a carcinogenicity study. The animal had a good nutritional status but had to be terminated due to sudden severe intestinal bleeding. No other clinical observations or gross lesions were reported.

Please tell us your morphological diagnosis.

Click on the images below for a larger view.
Fig. 1: H&E	Fig. 2: H&E
Fig. 3: H&E	Fig. 4: H&E