Section III. The form of imperative contrasting with hypothetical imperatives is the categorical imperative. This type of imperative purports to be true, or as is sometimes said, valid, apart from any presupposed end or purpose to be achieved by acting as it commands.ynthetic a priori. Kant claims that the categorical imperative is a synthetic a priori proposition. This means in part that we can know the categorical imperative that one ought to act only on maxims we can will to become universal laws independently of experience or any sensory observations.
The lung parenchyma is initially abnormal on chest radiographs in about one-half of patients. The percentage is higher on computed tomography which can detect disease when the radiograph is normal.
This is why transbronchial biopsy has such a high diagnostic yield and is the favored means of obtaining tissue for diagnosis. The involvement of the lung parenchyma by sarcoidosis can have very different appearances ranging from reticulonodular lung tissue densities to multiple masses and miliary lesions. These radiographic expressions of sarcoidosis can mimic many other diseases including malignancies and infections which involve the lungs.