Figure 1
Takano's classification for oral cavity lesions. In type I, point and small intrapapillary capillary loops (IPCLs) appear widespread on the mucosa. Elongated IPCLs with dilated calibre belong to type II. Extremely tangled IPCLs with larger calibre, creating a dotted pattern, are a typical feature of type III. Type IV is characterized by irregular vessels, extremely variable calibre, and no loops. Vascular patterns of type II, III, IV were considered as an indicator of neoplastic progression, and therefore judged as “positive” [47].