The lesion was observed as an incidental finding in the testis of a 22 months old male Wistar rat, which was found in a moribund condition after continued weight loss. At necropsy, one testis showed a glassy appearance.

Please send us your suggestions for immunohistochemistry and your tentative morphological diagnosis.

Click on the images below for a larger view.
Fig. 1: H&E, 1x	Fig. 2: H&E, 2x
Fig. 3: H&E, 5x	Fig. 4: H&E, 10x
Fig. 5: H&E, 20x	Fig. 6: H&E, 5x
Fig. 7: H&E, 10x	Fig. 8: H&E, 20x
Fig. 9: H&E, 5x	Fig. 10: H&E, 10x
Fig. 11: H&E, 20x