Shortness of breath

74 year-old woman who reports gradual onset of dyspnea on exertion over the past year. No chest pain, fevers chills or night sweats. She has a minor non-productive cough.
ROS: Some minor arthralgias, probably OA; o/w unremarkable.

PmHx: chronic UTI's followed by urology otherwise negative.

SH: Lifelong nonsmoker. Occupation was secretary.
FH: 2 daughters with fibromyalgia.
Travel Hx: Thailand in the past year.

On exam initially the lungs were clear to auscultation, but subsequent exams over the next year revelaed bilateral crackles, as can be imagined based on xrays shown below.

So over the next year she became more and more short of breath with the following progression on chest xray.
First CXR
CXR a few months later

CXR more months later with worsening dyspnea.

Here is a few CT slices around the time of the second chest xray (above):


ct up

ct mid

ctlow
What additional information would you like to know?

RF and ANA were low in the past.