Clinicopathological features of minute pharyngeal lesions diagnosed by narrow-band imaging endoscopy and biopsy

Table 2 Histological characteristics of the biopsied pharyngeal lesions n (%)

	Non-D	LGD	HGD
Number	34	25	3
IPCL
Upward extension	26 (76)	24 (96)	3 (100)
Dilatation and branching	5 (15)	21 (84)	3 (100)
Diameter expansion	0 (0)	8 (25)	1 (33)
Architectural atypia
Proliferative cell distribution
≥ 2/3	0 (0)	0 (0)	3 (100)
< 2/3	34 (100)	25 (100)	0 (0)
Tumor front	0 (0)	23 (92)	3 (100)
Cytological atypia
Abnormal variation in cell size	0 (0)	2 (8)	3 (100)
Abnormal nuclear arrangement	0 (0)	23 (92)	3 (100)
Increased nuclear size
High	0 (0)	0 (0)	3 (100)
Absent or low	34 (100)	25 (100)	0 (0)

Non-D: Non-dysplastic; LGD: Low-grade dysplasia; HGD: High-grade dysplasia; IPCL: Intra-papillary capillary loop.