| Namespace | MPheno.ontology | Obsolete | false |
| description | greater than the expected number of neoplasms that arise from hair matrix cells occurring in a specific population in a given time period; pilomatricoma is an encapsulated tumor containing irregularly shaped, lobules of cells separated by fibrovascular connective tissue stroma; two distinct cell populations comprise this tumor, basaloid cells with scant cytoplasm located towards the periphery and the ghost (or shadow) cells occupying the central portion |