Keaveny T V, Tawes R, Belzer F O
Br J Surg. 1971 Mar;58(3):233-4. doi: 10.1002/bjs.1800580319.
A case is presented in which toluidine blue-O was used to identify an islet-cell tumour of the pancreas. Metastatic deposits in two lymph-nodes were also stained. The method is recommended in exploration of the pancreas, especially when no tumour is palpable, or to identify metastatic spread of an islet-cell tumour.