Real time endoscopic ultrasound elastography and strain ratio in the diagnosis of solid pancreatic lesions

Table 1 Location of the Solid pancreatic Lesions

Location of pancreatic lesions	Number of cases = 172
Head of the pancreas	118
Uncinate process	7
Body of the pancreas	22
Tail of the pancreas	4
Diffuse involvement (pan-pancreatic lesion)	21

Table 2 Final diagnosis of solid pancreatic lesions

Nature of the lesion	Final diagnosis	Number of cases = 172
Benign lesions	Pancreatitis	49
(49 cases)	-Chronic pancreatitis	40
	-Autoimmune pancreatitis	9
Malignant lesions	Ductal adenocarcinoma	97
(123 cases)	Mucinous neoplasm	22
	Neuroendocrine tumors	2
	Lymphoma	1
	Metastasis	1

Table 3 Qualitative analysis by elastography distribution

Diagnosis (n = 172)	Score 1	Score 2	Score 3	Score 4	Score 5
Pancreatitis	6	25	12	-	6
Chronic pancreatitis	6	21	8	-	5
Autoimmune pancreatitis	-	4	4	-	1
Ductal adenocarcinoma	-	-	28	-	69
Mucinous neoplasm	-	-	3	-	19
Neuroendocrine tumors	-	-	1	-	1
Lymphoma	-	-	1	-
Metastasis	-	-	-	-	1

Table 4 Diagnostic values of elastography and strain ratio

	Elasticity score	SR 7.8	SR 3.8	Elasticity score and SR 7.8
Sensitivity	99%	92%	99%	98%
Specificity	63%	77%	53%	77%
PPV	87%	91%	84%	91%
NPV	96%	80%	96%	95%
Accuracy	88%	88%	86%	92%

PPV: Positive predictive value; NPV: Negative predictive value.