FOLH1 and metastatic malignant neoplasm in the lymph nodes: Notably, 99mTc-HYNIC-PSMA detected 35.6% PSMA positive lymph nodes less than 10 mm in diameter, highlighting good detection yield for small lymph node metastases, suggesting that SPECT can be used to diagnose lymph node metastases although it has an inferior resolution than PET.