to snoo-finity ... and beyond!
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There is not enough information in the question stem to determine what kind of cancer it is. You would need a biopsy and histology information to determine that. However, this is definitely not DCIS since there *is* a mass. DCIS usually just shows up as small microcalcifications on XR (I’d google an image so you can see it). All the words they use here describe an invasive cancerous scary mass -- what kind of cancer can’t be known until they biopsy it!
It's lupus, all the symptoms listed are classic especially the serositis. Anterior chamber of the eye = uveitis. Choroid plexus = cerebritis.
For a great overview, check out this (free) video: https://onlinemeded.org/spa/rheumatology/lupus/acquire
I think this was reactive arthritis, not lupus. Choroid plexus not just in the brain, also in eye (can’t see, can’t pee, can’t climb a tree). Mechanism of reactive arthritis is immune complex deposition, per UWorld, which was correct answer.
every time I read about Lupus there is something new!!