Table 4.

Cytomorphological features in cell block specimens divided according to accurately and falsely diagnosed cases groups

Cytomorphological feature		FN AUS (n = 17), n (%)	FN SUMP (n = 5), n (%)	TP BN (n = 21), n (%)	p values between groups
Background	Necrosis	1 (5.9)	0 (0.0)	0 (0.0)	0.457
	Haemorrhage	9 (52.9)	1 (20.0)	9 (42.9)	0.421
	Cystic haemorrhage	1 (5.9)	0 (0.0)	1 (4.8)	0.860
	Inflammatory background	0 (0.0)	0 (0.0)	2 (9.5)	0.333
	Lymphohistiocytic aggregates	2 (11.8)	0 (0.0)	9 (42.9)	0.035
	Granular cystic debris	1 (5.9)	0 (0.0)	0 (0.0)	0.457
	Macrophages	8 (47.1)	2 (40.0)	4 (19.0)	0.174
	Lymphocytes	13 (76.5)	4 (80.0)	19 (90.5)	0.494
	Plasma cells	0 (0.0)	0 (0.0)	3 (14.3)	0.185
	Neutrophils	6 (35.3)	4 (80.0)	3 (14.3)	0.014
	Adipocytes	1 (5.9)	0 (0.0)	0 (0.0)	0.457
	Crystals, crystalloids	2 (11.8)	0 (0.0)	0 (0.0)	0.201
	Debris	10 (58.8)	2 (40.0)	5 (23.8)	0.090
	Keratin	2 (11.8)	0 (0.0)	0 (0.0)	0.201
Architecture	Hypocellularity	1 (5.9)	0 (0.0)	0 (0.0)	0.457
	Sheets	0 (0.0)	1 (20.0)	1 (4.8)	0.175
	Formation of trabeculae	0 (0.0)	0 (0.0)	1 (4.8)	0.585
	Papillae	1 (5.9)	0 (0.0)	20 (95.2)	<0.001
	Discohesivity	1 (5.9)	0 (0.0)	0 (0.0)	0.457
	Single cells	1 (5.9)	1 (20.0)	0 (0.0)	0.154
	Small groups	2 (11.8)	0 (0.0)	6 (28.6)	0.218
Cell	Spindled cells	0 (0.0)	1 (20.0)	0 (0.0)	0.020
	Oncocytic cells	10 (58.8)	3 (60.0)	21 (100.0)	0.004
	Oncocytoid cells	1 (5.9)	1 (20.0)	0 (0.0)	0.154
	Acini	2 (11.8)	0 (0.0)	0 (0.0)	0.201
	Cytoplasmic granules	1 (5.9)	0 (0.0)	0 (0.0)	0.457
Nuclear	Size variability	1 (5.9)	0 (0.0)	0 (0.0)	0.457

FN, false negative; TP, true positive; AUS, atypia of undetermined significance; SUMP, salivary gland neoplasm of uncertain malignant potential; BN, benign neoplasm.