**Core Concept**
Neurofibromatosis is a genetic disorder characterized by the development of multiple noncancerous (benign) tumors in the nervous system, leading to various systemic manifestations. It is a result of mutations in genes that regulate cell growth and division.

**Why the Correct Answer is Right**
The correct answer is about identifying the characteristic not associated with neurofibromatosis. Neurofibromatosis type 1 (NF1) and type 2 (NF2) are the two main forms of the disorder. NF1 is characterized by café-au-lait spots, neurofibromas, and Lisch nodules, whereas NF2 is marked by bilateral vestibular schwannomas and other central nervous system tumors.

**Why Each Wrong Option is Incorrect**
**Option A:** Neurofibromas are a hallmark of NF1, so this option is incorrect.
**Option B:** Lisch nodules are a common ocular finding in NF1, so this option is incorrect.
**Option C:** Bilateral vestibular schwannomas are characteristic of NF2, so this option is incorrect.
**Option D:** Scoliosis is a common musculoskeletal complication in NF1, so this option is incorrect.

**Clinical Pearl / High-Yield Fact**
Neurofibromatosis type 1 has a higher risk of developing malignant peripheral nerve sheath tumors (MPNSTs) compared to the general population. Regular monitoring and screening for these tumors are essential in patients with NF1.

**Correct Answer:** D. Scoliosis is a common musculoskeletal complication in NF1.