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Example of discordant 131 I-MIBG and 111 In-pentetreotide tumor uptake. SPECT 131I-MIBG (A) and 111In-pentetreotide (B) images and corresponding CT (C) at the same level from subject #6 showing a large metastatic lesion that is both MIBG and pentetreotide positive (thin arrows), along with a metastasis which is MIBG positive and pentetreotide negative (black circle) and another that is pentetreotide positive and MIBG negative (thick arrow).
