Hyper-attenuated mucous obstructing distal segments of the right lower lobe in ABPA. Woman with asthma who developed ABPA after exposure to a mouldy house (new renovation that leaked). During pregnancy starting coughing black plugs up and had an episode of ‘pneumonia’. CT scan shows rounded opacities posteriorly in the right lung base which are enlarged bronchi full of mucus. On the lung windows, rounded shadows are typical of mucus in bronchi, with some surrounding inflammatory change, on the bone windows (shown here), the mucus in some places appears white than others, consistent with hyper-attenuated mucous (HAM)