score/[id]

Normal IPCL, or abnormal microvessels without severe irregularity

No invasion

Normal epithelium, inflammation, and LGIN

Type B vessels with a loop-like formation

T1a-EP or T1a-LPM

HGIN and invasive SCC

The B1 vessels normally appear as dot-like microvessels. The caliber of B1 vessels is around 20 μm.

Type B vessels without a loop-like formation that have a stretched and markedly elongated transformation

T1a-MM or T1b-SM1

The B2 vessels often show a multilayered arrangement or an irregularly branched/running pattern.

Highly dilated abnormal vessels whose caliber appears to be more than three times that of the usual B2 vessels

T1b-SM2 or deeper

The B3 vessels often appear green in color. The caliber of B3 vessels is often larger than 60 μm.

A low or no vascularity area surrounded by all subtypes of type B microvessels, including B1. The stretched irregular vessels themselves are not included in AVA.

Smaller than 0.5 mm in diameter

0.5 mm or between 0.5 and 3 mm

3 mm or larger

Any types of AVA (small, middle, and large) surrounded by B1 vessels are suggestive of T1a-EP or T1a-LPM SCC.

AVA-middle surrounded by B2 or B3 vessels is suggestive of T1a-MM or T1b-SM1. AVA-large surrounded by B2 or B3 vessels is suggestive of T1b-SM2 invasive SCC.