Iris melanoma

Iris melanoma in a Rottweiler. The black asterisk identifies the anterior chamber, which appears deformed by the tumour (red asterisks). The same area is signalled in the right-side image with black asterisks, denoting how the neoplasia was growing towards the posterior chamber. The malignant nature of the tumour became quite evident after distant metastization to a limb. Below, a histology image shows the microscopic characteristics of the neoplasia, with prominent fusiform cells containing little or no melanic pigment. Several mitoses can also be seen (H&E, 100x).