How is use of diagnostic lap in pancreatic cancer?

About 20% of Pt with Resectable Dz on Preop. investigation , is unresectable Dz at Op.room Diag.Lap. : imp. Acc. For predict resectability to 98% Gen. Explor peritoneal surface Lig. of Treitz , Base of the T.colon Incised Gastocoloic Lig. , explor Lesser sac. US probe using for exam. : Liver , Porta., PV , SMA % of +ve pt. by Lap. Dx 10-30% in lesion at head 50% in lesion at body and tail