Why do this tumors show blooming artifact?
Blooming artifact is mostly attributed to melanin's paramagnetic effects, but old blood products may also contribute to it.
1. Fusocellular neoplasm with areas of pigmentation consistent with melanin.
2. Skull bone shows areas of melanocytes.
3. S100 protein marker shows diffuse positive stain.
4. Ki-67 marker shows a few punctate isolated positive foci