Correct!
5. All of the above

At this stage the cause of her neurologic findings is unclear.

The following additional laboratory tests were ordered:

• ANA, ANCA and Lyme serology were all negative
• Serum ACE was within normal limits.
• VDRL was nonreactive.
• Chest x-ray was interpreted as normal.

Based on these findings which of the following are reasonable differential diagnosis possibilities?

1. Idiopathic hypertrophic pachymeningitis
2. Sarcoidosis
3. Wegener’s granulomatosis (granulomatosis with polyangitis, GPA)
4. 1 and 3
5. All of the above

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