Figure 1.

Algorithmic approach to organizing pneumonia. ∗ A formal MDD may not be required in all cases, especially if the combination of clinical context and radiographic pattern is sufficiently convincing of the OP diagnosis. In such cases, a discussion between the physician and the radiologist is strongly encouraged. CRP = C-reactive protein; DAH = diffuse alveolar hemorrhage; Dx = diagnosis; ESR = erythrocyte sedimentation rate; GGO = ground-glass opacification; HRCT = high-resolution CT; MDD = multidisciplinary discussion; nl Pro-Cal C = normal procalcitonin; nl WBC = normal WBC; OP = organizing pneumonia.