Krenning score explained

Krenning score
Purpose:	grade uptake intensity of neuroendocrine tumors

The Krenning score^[1] is used to grade the uptake intensity of neuroendocrine tumors on somatostatin receptor imaging such as octreotide scan. Typically, peptide receptor radionuclide therapy (PRRT) is considered when the Krenning score is greater than 2.

Krenning Score

Grade 1: uptake < normal liver

Grade 2: uptake = normal liver

Grade 3: uptake > normal liver

Grade 4: uptake > spleen or kidneys

Notes and References

1. Kwekkeboom. DJ. Krenning. EP. Somatostatin receptor imaging.. Seminars in Nuclear Medicine. April 2002. 32. 2. 84–91. 11965603. 10.1053/snuc.2002.31022.