Histologically, these tumours exhibit an infiltrative growth pattern, small basaloid cells and prominent peripheral palisading [11]. The differential diagnosis of BSCC includes a solid variant of adenoid cystic carcinoma, which usually shows positivity for C-kit, SCNEC, which shows a positive reaction for TTF-1 and a negative reaction for 34βE12. This evidence concerns the gene TTF1 and adenoid cystic carcinoma.