FINDINGS:

There is a round opacity in the right mid lung with a thin crescent of lucency near the upper border.

PATTERN:

The definition of a mass is fulfilled, with slight cavitation causing the rim of lucency

DIFFERENTIAL DIAGNOSIS:

Of the five causes of masses, malignancy and inflammation are the most likely to cavitate. The smooth inner border of the lucency favors inflammation over malignancy.

DIAGNOSIS:

Abscess, bacterial

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CORRELATION:

The mass has eroded into a bronchus, but there is little liquified necrosis; the air from the bronchus thus surrounds the upper portion of the central region of the mass.