On chest film, hamartoma appears as a rounded opacity or coin lesion.

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Multiple Choice

On chest film, hamartoma appears as a rounded opacity or coin lesion.

Pulmonary hamartoma commonly presents on a chest radiograph as a solitary, well-circumscribed, round or oval nodule in the lung periphery—a coin-like lesion. This “coin lesion” description is the classic radiologic hallmark and reflects its benign, discrete nodule that can be seen as a round opacity on a frontal view. Many hamartomas contain cartilage, so they may show calcifications, sometimes described as popcorn calcifications, which can help distinguish them from malignant nodules. Ground-glass opacity is a hazy, diffuse increase in attenuation that still lets the vessels be seen and is typical of partial air-space disease such as edema, infection, or inflammation, not a discrete rounded nodule. Pleural effusion is fluid in the pleural space, which blunts the costophrenic angles and distorts the diaphragms rather than forming a discrete kidney- or coin-shaped nodule. Cavitary lesion refers to a lesion with a central cavity, often due to necrosis or infection, which is not the appearance of a typical hamartoma. So the rounded, coin-like nodule on chest film best fits a pulmonary hamartoma.

Pulmonary hamartoma commonly presents on a chest radiograph as a solitary, well-circumscribed, round or oval nodule in the lung periphery—a coin-like lesion. This “coin lesion” description is the classic radiologic hallmark and reflects its benign, discrete nodule that can be seen as a round opacity on a frontal view. Many hamartomas contain cartilage, so they may show calcifications, sometimes described as popcorn calcifications, which can help distinguish them from malignant nodules.

Ground-glass opacity is a hazy, diffuse increase in attenuation that still lets the vessels be seen and is typical of partial air-space disease such as edema, infection, or inflammation, not a discrete rounded nodule. Pleural effusion is fluid in the pleural space, which blunts the costophrenic angles and distorts the diaphragms rather than forming a discrete kidney- or coin-shaped nodule. Cavitary lesion refers to a lesion with a central cavity, often due to necrosis or infection, which is not the appearance of a typical hamartoma.

So the rounded, coin-like nodule on chest film best fits a pulmonary hamartoma.

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