Intraoperative Touch Imprint Cytology of Brain Neoplasms: A Useful High-Diagnostic Tool in 93 Consecutive Cases; Differential Diagnoses, Pitfalls, and Traps

Table 2

Sensitivity and specificity of touch imprint cytology and final histopathological diagnosis for brain neoplasms.

	Positive/total (%)
	Glial tumors	Nonglial tumors	Metastatic (secondary) tumors
Sensitivity	32/33 (97)	20/21 (95.2)	28/31 (90.3)
Specificity	4/4 (100)	4/4 (100)	3/31 (9.7)
Positive predictive value	32/32 (100)	20/20 (100)	28/28 (100)
Negative predictive value	4/5 (80)	4/5 (80)	3/3 (100)

Sensitivity = true positive/true positives + false negatives; specificity = true negatives/true negatives + false positives; positive predictive value = true positives/true positives + false positives; negative predictive value = true negatives/true negatives + false negatives.