PUO or pyrexia of unknown origin has got new definition which includes now the OPD visits as
1) 3 outpatient visits or
2)3 days in the hospital with no elucidation of a cause...or
3) 1 week of intelligent and invasive investigation..
PUO includes causes like malignant causes, connective tissue
disorders, any underlying abscesses or infections,miscellaneous disorders like alcoholic hepatitis
or granulomatous conditions, and finally undiagnosed conditions.
In your case band cells and toxic granules suggest some infective conditions and HRCT
evidence also suggests this, one option can be go for bronchoscopy
and protected brush specimen to undergo AFB staining, grams stain, culture sensitivity and cytology examination....
best wishes and thanks for considering HCM