Comprehensive Evaluation of Lung Lesions, Before and After Birth
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In Utero InsightsAt the Center for Fetal Diagnosis and Treatment, we believe one of the most important elements of care is careful diagnostic testing and interpretation of results, both prenatally and postnatally. At their first visit with us, women with a suspected lung lesion undergo a day of testing using the most advanced diagnostic equipment to evaluate the fetal chest. The expertise of our imaging team frequently leads to additional findings and may significantly alter the initial diagnosis.
A sonographer and a radiologist, both highly specialized in diagnosing fetal anomalies, use state-of-the-art ultrasound machines and high-frequency probes, as well as 3-D and 4-D techniques if needed, to visualize a baby’s condition. The examination is held in a private room with a TV screen overhead so the family can watch the ultrasound in real time. Our team thoroughly examines the fetus from head to toe, including fine details such as the ears, corpus callosum and the conus medullaris. We have developed specific ultrasound protocols for each suspected anomaly and typically devote up to 1½ hours or more for each initial scan.
Fetal magnetic resonance imaging (MRI) provides excellent soft tissue resolution and proportionate anatomic detail of the anomaly, and often provides important information about the patency, caliber and position of the fetal airway. This information is critical in counseling and management decisions.
Postnatal computed tomography angiography (CTA) within the first two months of life provides information essential for diagnostic confirmation and surgical planning. This technique allows multiplanar reconstructions of the airway, lung parenchyma and vasculature. CT images are compared with prenatal studies. Studies performed at CHOP also allow for additional imaging post processing that provides important information in some cases.
The CHOP nursing and sedation staff is highly attuned to the unique imaging and sedation needs of pediatric patients. Our experienced pediatric radiologists perform CTA adhering to ALARA (As Low As Reasonably Achievable) principles for radiation exposure. CTA protocols have been designed with attention to radiosensitivity, low body weight index, faster heart rates, smaller cardiovascular structures and increased patient motion. The administration of intravenous iodinated contrast material helps to define vascular anatomy.
(A) Transverse view of the chest demonstrating a dilated fluid-filled bronchus in a case of bronchial atresia that was referred as a CCAM. (B) Sagittal view of a hybrid lesion, demonstrating a systemic feeding vessel from the celiac axis below the diaphragm. (C) Transverse view of the same hybrid lesion, demonstrating the pulmonary draining vein.
Contributed by: Ann M. Johnson, MD, Beverly G. Coleman, MD, FACR
Categories: In Utero Insights Winter 2014