epithelial neoplasms of hair germ are further subdivided into those that are purely epithelial ( trichoblastomas ) and into epithelial neoplasms with mesenchymal components that may cause inductive changes toward the earliest phase of hair follicle differentiation ( trichoblastic fibroma ) or a more advanced and complete hair follicle formation ( trichogenic trichoblastoma ) .
C0221971
hair follicle
C0349658
trichogenic trichoblastoma