A 20-year-old man with Marfan syndrome is having back pain. On examination, there is a curvature of his thoracic spine to the left. Which of the following is the most appropriate next step in management?
Marfan syndrome is a connective tissue disorder that affects the cardiovascular, skeletal, and ocular systems. One of the skeletal manifestations is scoliosis. The presence of scoliosis in someone with Marfan can lead to complications like dural ectasia, where the dura mater bulges due to weakened connective tissue. This can cause back pain and neurological symptoms.
The next step in management would involve imaging to assess the extent of the curvature and check for dural ectasia. MRI of the thoracic spine is the best choice because it provides detailed images of the spinal cord, dura, and surrounding structures without radiation. MRI can also detect any spinal cord compression or other abnormalities associated with the curvature.
Looking at the options, the correct answer would be MRI of the thoracic spine. The other options might include X-ray, which is less detailed for soft tissues, or CT scan, which uses radiation and isn't as good for soft tissue contrast. Physical therapy or observation might be considered if there's no neurological deficit, but given the presence of left curvature and back pain, imaging is necessary first.
So, the most appropriate next step is MRI to evaluate for dural ectasia and other complications.
**Core Concept** Marfan syndrome is a connective tissue disorder associated with dural ectasia, a common cause of chronic back pain. Thoracic scoliosis in Marfan patients increases the risk of spinal cord compression and requires imaging to assess for neurological compromise.
**Why the Correct Answer is Right** MRI of the thoracic spine is the gold standard to evaluate for **dural ectasia**, **spinal cord compression**, and **myelopathy** in patients with Marfan syndrome and scoliosis. It provides high-resolution images of soft tissues, including the dura, spinal cord, and intervertebral discs, without ionizing radiation. Left thoracic curvature (left-sided scoliosis) is a classic presentation, and MRI helps differentiate structural from non-structural causes of back pain.
**Why Each Wrong Option is Incorrect**
**Option A:** X-ray of the spine lacks sensitivity for soft tissue abnormalities like dural ectasia and provides limited detail for spinal cord evaluation.
**Option B:** CT scan is inferior to MRI for visualizing the spinal cord and dura, and exposes the patient to unnecessary radiation.
**Option C:** Physical therapy is inappropriate without confirming the absence of spinal pathology.
**Option D:** Observation alone is unsafe in Marfan syndrome due to the risk of progressive myelopathy.
**Clinical Pearl / High-Yield Fact** In Marfan syndrome, **dural ectasia** is a hallmark finding on MRI, appearing as a "black hole" on T2-weighted images due to CSF flow voids. Always consider spinal imaging in patients with Marfan syndrome and new back pain to prevent missed myelopathy.
**Correct Answer: C. MRI of the thoracic spine**