1 MCQs in Medicine for NEET PG
A 35-year-old man presents with a painless left neck mass and pulsatile tinnitus. Imaging reveals a carotid body paraganglioma. His father had a similar tumor at age 40, but his mother is unaffected despite carrying the same SDHD mutation. The inheritance pattern shown in the pedigree is marked as **A** — paternal-only transmission with maternal imprinting. Which of the following best explains why this patient's mother, though a carrier of the SDHD mutation, remains clinically unaffected?
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