However, PSMA is also commonly expressed in other malignancies such as breast cancer, thyroid carcinomas, and head and neck malignancies, which increases the chances of their incidental diagnosis on PSMA PET scans.2, 3, 4However, biliary tract cancers are not commonly expected to be incidentally diagnosed on PSMA PET imaging. The gene discussed is FOLH1; the disease is thyroid gland carcinoma.