CT angiogram sign - lung adenocarcinoma

The right lower lobe bronchus is infilteredoccluded, and collapse consolidation of the right lower lobe is evident. A large ill-defined infiltrative mass encases the right hilar structures and extends into the adjacent mediastinum. After contrast mediamedium administration, vessels appear prominent as theyvessels traverse an airless low attenuation portion of the consolidated lung, resembling (CT angiogram signssign), and are displaced around a relatively hypovascular and lower attenuation area.

A few subcarinal and right paratracheal lymphadenopathylymph nodes have a short axis diameter of less thanup to 20 mm.

Mild leftmediastinal shift to right shifting of the heart and mediastinum is also seenright.

The patient underwent a bronchoscopy and biopsy, and histopathology with IHC evaluation confirmed poorly differentiated non-small cell lung carcinoma, adenocarcinoma subtype.

This case also demonstrates athe CT angiogram sign that refers to normally enhancing pulmonary vessels appearing prominent on contrast-enhanced CT as they traverse an airless, low-attenuation portion of the consolidatedatelectatic lung. The atelectatic lung relativeis hyperattenuating to skeletal muscle whereas the chest wall musculaturetumour is relatively hypoattenuating.

ThisThe CT angiogram sign is often associated withcan be seen in post-obstructive atelectasis, pneumonia, pulmonary oedema and malignancies such as lung adenocarcinoma, pulmonary lymphoma, and metastasis from gastrointestinal carcinoma. However, it may also be seen in infectious and post-obstructive pneumonia and pulmonary oedema. In this case the tumour