A 14-year-old boy is brought to the office due to painless nodules on his lips and tongue that have been progressively enlarging. He underwent total thyroidectomy 5 years ago following the discovery of a thyroid mass and takes thyroid hormone replacement. On physical examination, he is tall and slender with disproportionately long arms and legs, long thin fingers, and joint laxity. Oral inspection reveals several small, soft, flesh-colored papules on his lips and tongue. Serum TSH is normal. This patient most likely has which of the following conditions?
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