The authors’ observations
The neurology team initially suspected Charcot-Marie-Tooth disease because her clinical presentation included pes cavus, distal lower extremity weakness, and lower extremity muscle atrophy with a self-reported family history of similar gait disturbance, all of which are consistent with Charcot-Marie-Tooth disease.
Subcortical syndrome—a feature of vascular dementia—is characterized by focal motor deficits, gait disturbance, history of unsteadiness with frequent falls, urinary symptoms, personality and mood changes, and cognitive dysfunction.1-3 Subcortical syndrome is caused by chronic ischemia and lacunar infarctions that affect cerebral nuclei and white matter pathways.1 On imaging, subcortical vascular dementia is characterized by leukoaraiosis, which are hypointense spherical-like lesions on CT and hyperintense lesions in periventricular areas on T2 MRI.4
Although normal pressure hydrocephalus could be suspected given her clinical presentation of the Hakim-Adams triad (ie,“wacky, wobbly, and wet”), her head CT did not show any changes consistent with this condition.
Her clinical presentation does not align with schizophrenia spectrum disorder because of her history of higher functioning, acute later onset, and the absence of hallucinations, fixed delusions, or markedly disorganized speech. Although she is paranoid of her surroundings, her delusions were ill-formed. A cord lesion compression cannot be ruled out, and MRI is required urgently.
HISTORY High functioning
When asked, Ms. S states that she was admitted to the hospital because “someone who looked like a fake police officer [a member of the fire department] told me it was nice here.” She indicates that she initially thought it would be a nice place to live temporarily but later regretted coming after realizing that she was in a psychiatry unit. Available documentation from her recent hospitalization indicated that she was living in a motel on her own. Ms. S says that she works as an actress and has had minor roles in famous movies. She says that she studied at a well-known performance arts school and that her parents are famous musicians; however, she refuses to identify her parents or give permission to contact them—or any other collateral informant—because she is embarrassed about her current situation stating, “They would never believe it.”
During this interview, Ms. S appears confused as well as disorganized—which was a challenge to clearly delineate—disheveled, and guarded with hypoverbal and hypophonic speech. Her thought process is circumstantial, and she seems to be confabulating. She denies visual or auditory hallucinations but appears paranoid and states that she thinks we are experimenting on her. Except for the neurological exam, the rest of her physical exam is within normal limits. Urine toxicology screen and labs are negative except for a positive antinuclear antibody homogenous pattern with a titer of 1:640; B12 vitamin levels are not tested.
MRI is ordered, however, she does not consent to the scan saying, “It’s creepy, I don’t want people looking at my brain.” The team makes several attempts to encourage her for consent but she refuses. Because of the clinical urgency (ie, possible cord compression) and her refusal to provide a surrogate decision maker, the team felt the situation is urgent, confirmed by 2 physicians, which led them to perform the MRI on an emergent basis. The MRI reveals multiple periventricular, juxtacortical, infratentorial, and likely cervical spinal cord T2 hyperintense lesions (Figure).
What would be your differential diagnosis at this time?
a) acute disseminated encephalomyelitis (ADEM)
b) systemic lupus erythematous
c) multiple sclerosis
d) vascular dementia
e) vitamin B deficiency