Figure 1.
Defined classification system for extracapsular extension in nodal metastases. Grade 0 and 0c are considered to represent no extracapsular extension, while Grade 1 represents simple extracapsular extension with tumor cells invading perinodal soft tissue in the background of an at least partially preserved lymph node and Grade 2 represents nodal metastases where tumor cells have obliterated all nodal tissue and are just growing in irregular collections (so-called “soft tissue metastasis”).