The ultrastructure of a pilar tumor of the nose is described for the first time. Evidence of sebaceous cell and possible apocrine duct cell differentiation is seen. In addition, the presence of ossification within the tumor is described, a feature not previously reported.
Roberts PF, Jerrome DW. Ultrastructure of a Pilar Tumor. Arch Dermatol. 1973;108(3):399-402. doi:10.1001/archderm.1973.01620240049014