Linhagem
- Origem em transformação maligna de pilomatricoma
- Pode ter origem primitiva pilomatricial
Clinical presentation
- Location at the nape of the neck or upper back
Histology
- Pilomatricoma structures
- Undifferentiated and infiltrating basaloid structures
- Signs of vascular invasion and perineural permeation
Prognosis
- There are cases with visceral metastasis
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