By P.M. Bioselle, C. White
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Additional info for New Techniques in Thoracic Imaging
Computed tomography shows small, peripheral well-circumscribed nodule in right upper lobe (arrow). Low attenuation within nodule (attenuation Ϫ106 HU) is consistent with fat and diagnostic of hamartoma. Figure 11 Hamartoma. Computed tomography shows well-circumscribed nodule in right upper lobe. Focal punctate calcifications are suggestive of hamartoma. Similar calcifications can, however, be seen in carcinoid tumors. Small focal areas of fat within the nodule are diagnostic of hamartoma (arrow).
Management of a nodule depends on the likelihood of malignancy and includes observation, resection, and biopsy. Observation is usually undertaken if the probability of malignancy is low or the patient’s clinical status either precludes further evaluation or suggests a nonmalignant etiology. For instance, in a patient presenting with a new focal abnormal pulmonary opacity and clinical findings of pneumonia, radiographical reassessment after a short interval may be all that is necessary to exclude malignancy and confirm a diagnosis of round pneumonia (Fig.
Avium intracellulare infection. Noninvasive Assessment of the SPN 39 Figure 17 Squamous-cell lung cancer. Computed tomography shows thin-walled cavitary nodule in right upper lobe (arrows). Soft tissue within nodule is due to necrotic lung. Extensive necrosis can occasionally result in thin walls and erroneously suggest a benign etiology. monary neoplasms or sequelae of prior pulmonary infections. An absence of visible growth over a 2-year period is generally reliable in determining benignity [1,35,36].
New Techniques in Thoracic Imaging by P.M. Bioselle, C. White