On distinction between papillary carcinoma (Hurthle cell variant) and Hurthle cell adenoma, sensitivity, specificity, and diagnostic accuracy were 100%, 75% and 83.3% respectively, with CK19/CD56 staining combination.
Material from 12 female and 15 male patients (13 granular cell tumours of the sellar region, 10 pituicytomas, four spindle cell oncocytomas) collected in the German Registry of Pituitary Tumours between 1993 and 2015 was re-evaluated according to the current WHO classification of tumours of the central nervous system and supplementary immunohistochemistry including S100-protein, CD56, CD68, thyroid transcription factor-1 (TTF-1), and Ki-67 was performed.