Figure 10. .

False-positive diagnosis of miliary disease. Faced with this pattern of profuse micronodules (a), this patient was diagnosed with miliary tuberculosis, and consequently treated with antituberculous quadritherapy. However, the patient experienced a worsening of dyspnea and severe cough when he returned back home. The final diagnosis was hypersensitivity pneumonitis related to a humidifier use. Note the sparing of the juxtafissural area, which allows a definite diagnosis of centrilobular nodules (arrows) (b). A miliary disease was initially diagnosed on thin slices in this other patient with severe dyspnea and hypoxemia (c). A 4 mm-thick MIP demonstrates a tree-in-bud appearance (d), with a typical sparing of the subpleural area characteristic of centrilobular nodules, more difficult to assess on thin section. In association with the tree in bud appearance, this was strongly suggestive of bronchiolitis that was related to cannabis exposure and subsequently resolved after interruption of its use. MIP, maximum intensity projection.