In a patient with known APS (triple positive) and interstitial lung disease (NSIP), how do you distinguish APS associated lung involvement from connective tissue disease related ILD?

Patients with APS typically have vascular and thrombotic pulmonary disease, and very rarely has interstitial disease been ascribed to APS. The most common pulmonary manifestation of APS is pulmonary embolism, occurring in 14-16% of patients, followed by pulmonary hypertension often caused by chronic...