SDHD and adrenal gland pheochromocytoma: This highlights the importance of repeating diagnostic imaging tests to detect any other extra-adrenal paragangliomas in patients diagnosed with PCC; it is particularly important in pediatric cases since recurrent tumors are more common in children with PGLs than in adults.13 We found a novel heterozygous mutation in the SDHD gene in a patient who had been showing unusual symptoms, and we will report any significant clinical manifestations that may arise in the future.