| The chest radiograph showed a small left pleural effusion and oligemia of the right upper lung field. |
| Focal hyperemia followed by spreading oligemia and impaired activation of rCBF in classic migraine. |
| Vascular compartment reacts with initial hyperemia followed by long-term oligemia. |
| The severity of oligemia correlates well with hemodynamic abnormality. |
| Oligemia is considered to be present if, in a given lung region, the pulmonary vasculature is greatly diminished with concomitant hyperlucency of the lung parenchyma. |
