Here an example of a high grade mastceltumor. I can recommend everybody to read

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Here an example of a high grade mastceltumor. I can recommend everybody to read this article on grading mastceltumors on cytology to predict prognosis:
[color=var(--blue-link)]https://todaysveterinarypractice.com/.../TVP-2023-0304...

This patient (8 yrs American Stafford,MC) had an infected ulcerated nodule. The owner chose to remove without cytology. A colleque operated the dog and took the nodule a way with 1.5 cm margins. The dog came back to me because the owner saw a new 'inflammatory nodule'. It turned out that more nodules were growing,  also at the scar of the removed nodule.

Cytology confirmed my suspicion -> many mastcells, some had no granules at all. Anisocytosis and anisokaryosis, bi- and multiple nucleation, regular mitotic figures.