A patient presents with recurrent optic neuritis of both eyes with extensive transverse myelitis. Visual acuity in right eye is 6/60 and visual acuity in left eye is 6/18. Patient showed 50% response to steroids. Diagnosis is:
**Core Concept**
Recurrent optic neuritis and transverse myelitis in a patient with variable visual acuity suggest a chronic inflammatory demyelinating disease of the central nervous system. This condition is characterized by autoimmune-mediated damage to the myelin sheath, leading to demyelination and axonal loss.
**Why the Correct Answer is Right**
The patient's presentation is classic for Multiple Sclerosis (MS), a chronic autoimmune disease that affects the central nervous system (CNS). The presence of recurrent optic neuritis and transverse myelitis is pathognomonic for MS. The variable visual acuity and the partial response to steroids further support this diagnosis. In MS, the immune system attacks the myelin sheath, leading to demyelination and axonal loss, which can result in a wide range of neurological symptoms.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is likely incorrect because it does not match the clinical presentation of the patient. While other conditions, such as neuromyelitis optica (NMO), can present with optic neuritis and transverse myelitis, the variable visual acuity and partial response to steroids are more characteristic of MS.
* **Option B:** This option may be a distractor, but it does not accurately describe the patient's condition. While optic neuritis and transverse myelitis can occur in other conditions, such as Lyme disease or sarcoidosis, the combination of symptoms and response to steroids in this patient is more consistent with MS.
**Clinical Pearl / High-Yield Fact**
In patients with a suspected diagnosis of MS, it's essential to look for the presence of oligoclonal bands in the cerebrospinal fluid (CSF), which are a hallmark of the disease. Oligoclonal bands are a type of immunoglobulin that is produced in the CNS and can be detected in the CSF of patients with MS.
**Correct Answer:** C. Multiple Sclerosis