1 MCQs in Medicine for NEET PG
A 15-year-old boy presents with marfanoid habitus, mucosal neuromas on the lips and tongue, chronic constipation with megacolon, a thyroid nodule, and serum calcitonin of 950 pg/mL. Imaging reveals a 4.5 cm right adrenal mass with elevated plasma metanephrines. Molecular testing confirms a pathognomonic M918T missense mutation in exon 16 of the RET protooncogene. The mutation is located at the locus marked **A** in the diagram. Which of the following best characterizes this genetic alteration?
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