Pseudotumor cerebri vs Brain tumor
How to tell Pseudotumor cerebri and Brain tumor apart when a board question makes them look alike.
Pseudotumor is high ICP with normal imaging and normal CSF contents; brain tumor is high ICP or deficits with a mass lesion.
Side by side
Idiopathic intracranial hypertension causes headache, papilledema, transient visual obscurations, pulsatile tinnitus, sixth nerve palsy, normal neuroimaging without mass, and elevated opening pressure with normal CSF contents.
Brain tumor causes headache or seizures with focal neurologic deficits, mass lesion on imaging, edema, mass effect, or progressive course depending on location.
Raised intracranial pressure occurs without a structural mass, often in young women with obesity or medication triggers such as tetracyclines or vitamin A derivatives.
A neoplasm directly occupies space, infiltrates brain tissue, disrupts function, and may obstruct CSF or cause edema.
Normal MRI/MRV except signs of raised ICP, elevated LP opening pressure, and normal CSF composition support pseudotumor cerebri after mass is excluded.
Enhancing mass, focal edema, midline shift, necrosis, calcification, or tumor-specific imaging features support brain tumor.
The trap
Papilledema can occur in both, so imaging before LP and mass-versus-no-mass is the key separator.
The repair move
For papilledema, first exclude a mass, then use opening pressure and CSF contents.
Try a free question
CoreA young woman with obesity has headaches, transient visual obscurations, pulsatile tinnitus, papilledema, normal MRI/MRV without mass, and elevated opening pressure with normal CSF contents. Which diagnosis is most likely?
Show answer and explanation
Answer: A. Pseudotumor cerebri. Raised ICP with papilledema, normal imaging without mass, and normal CSF contents supports pseudotumor cerebri.
Why the other choices are tempting
- B. Brain tumor should show a mass lesion or infiltrative imaging abnormality.
- C. Subarachnoid hemorrhage causes thunderclap headache and blood in CSF spaces.
- D. Migraine does not cause papilledema or elevated opening pressure.
- E. Multiple sclerosis causes demyelinating lesions and neurologic episodes, not isolated high opening pressure.
Flashcards
Tap a card to flip it.
What opening pressure pattern supports pseudotumor cerebri?
Elevated opening pressure with normal CSF contents supports pseudotumor cerebri after mass is excluded.
What imaging pattern supports brain tumor over pseudotumor?
A focal mass lesion with edema or mass effect supports brain tumor.
Quick answers
What is the fastest way to tell Pseudotumor cerebri from Brain tumor?
Pseudotumor is high ICP with normal imaging and normal CSF contents; brain tumor is high ICP or deficits with a mass lesion.
What is the key clue for Pseudotumor cerebri?
Idiopathic intracranial hypertension causes headache, papilledema, transient visual obscurations, pulsatile tinnitus, sixth nerve palsy, normal neuroimaging without mass, and elevated opening pressure with normal CSF contents.
What is the key clue for Brain tumor?
Brain tumor causes headache or seizures with focal neurologic deficits, mass lesion on imaging, edema, mass effect, or progressive course depending on location.
What is the common trap with Pseudotumor cerebri vs Brain tumor?
Papilledema can occur in both, so imaging before LP and mass-versus-no-mass is the key separator.