CH_CRL (v0.2.1)
This page is part of the CH-CRL (R4) (v0.2.1: STU) based on FHIR R4. This is the current published version. For a full list of available versions, see the Directory of published versions 
Perineural invasion is the process of neoplastic invasion of nerves. Perineural invasion (Variable number: 4.16) in 'NATIONAL CANCER DATA DICTIONARY, V 1.1, Part A, BASIC VARIABLES for Adults, Adolescents, and Children' see Nationale Krebsregistrierungsstelle > Partner im Gesundheitswesen > Information, Grundlagen und Datenstruktur zum KRG.
This code system http://fhir.ch/ig/ch-crl/CodeSystem/nkrs-perineuralinvasion defines the following codes:
| Code | Display | Definition |
| 0 | Pn0 | No perineural invasion. |
| 1 | Pn1 | Perineural invasion. |
| 8 | PnX | Perineural invasion cannot be assessed. |