Differential Diagnosis for Acute Diplopia with Mild to Moderate T2 Hyperintense Periventricular and Subcortical Lesions
- Single Most Likely Diagnosis
- Multiple Sclerosis (MS): This is a leading consideration due to the presence of periventricular and subcortical lesions on MRI, which are characteristic of MS. The acute onset of diplopia can be a presenting symptom of a relapse in MS.
- Other Likely Diagnoses
- Acute Disseminated Encephalomyelitis (ADEM): Although less common than MS, ADEM can present with similar MRI findings and acute neurological symptoms, including diplopia. It is often considered in the differential diagnosis, especially in patients without a prior history of MS.
- Small Vessel Disease: This condition can cause subcortical and periventricular white matter lesions due to chronic small vessel ischemic changes. While it might not directly cause acute diplopia, it could contribute to the neurological presentation in conjunction with other factors.
- Do Not Miss Diagnoses
- CNS Vasculitis: This is a critical diagnosis not to miss due to its potential for severe morbidity and mortality if left untreated. CNS vasculitis can present with a wide range of neurological symptoms, including acute onset of diplopia, and can cause lesions visible on MRI.
- CNS Lymphoma: Although rare, CNS lymphoma can present with periventricular and subcortical lesions and acute neurological symptoms. It requires prompt diagnosis and treatment to improve outcomes.
- Rare Diagnoses
- Progressive Multifocal Leukoencephalopathy (PML): This rare and often fatal viral disease caused by the JC virus affects the brain and leads to the destruction of the myelin sheath. It typically occurs in immunocompromised individuals and can present with subcortical and periventricular white matter lesions.
- Susac Syndrome: A rare condition characterized by microangiopathic changes in the brain, retina, and cochlea, leading to a variety of symptoms including vision loss, hearing loss, and neurological deficits. It can present with lesions on MRI similar to those described.