A pseudocavity is a radiological finding seen on high-resolution CT
(HRCT) scans of the lungs, characterized by a small, rounded, low
attenuation area within a region of ground-glass opacity or
consolidation. Unlike true cavities, which have defined walls and
are caused by tissue necrosis, pseudocavities lack a discernible
wall and are not due to tissue destruction. They can be associated
with various conditions, including organizing pneumonia,
adenocarcinoma, and pulmonary edema. The pathogenesis
involves air being trapped within inflamed or collapsed lung tissue,
creating the appearance of a hollow space. Pseudocavities are
important to distinguish from true cavities, as they can help guide
the differential diagnosis and are generally considered benign
findings. Diagnosis is based on imaging features, where
pseudocavities are seen as air-filled spaces without thickened
walls, and further clinical correlation is needed to identify the
underlying cause