Neonatal Nurse Practitioner Practice Exam

Which imaging technique is the preferred modality to evaluate the anatomy of obstructing tissue in choanal atresia?

1. Computed tomography

2. Ultrasound

3. X-ray

4. MRI

The correct answer is: Computed tomography

Computed tomography is the preferred modality for evaluating the anatomy of obstructing tissue in choanal atresia due to its ability to provide highly detailed cross-sectional images of the nasal passages and surrounding structures. This imaging technique allows for a clear visualization of the extent and nature of the obstruction, which is critical for planning surgical intervention. CT scans offer excellent detail in differentiating soft tissues and bony structures, making it particularly useful in identifying the type of choanal atresia (whether bony or membranous) and any associated anomalies. This is vital in the management of the condition, as understanding the exact anatomical context can significantly influence surgical strategy. Other imaging modalities have limitations in this scenario. Ultrasound, while non-invasive and beneficial in neonatal settings, does not provide the level of detail needed for complex congenital anomalies like choanal atresia. X-rays may not offer adequate distinction between soft tissue and bony structures in this specific context. MRI, although excellent for soft tissue differentiation, is less commonly used due to longer scan times and the challenges of patient sedation or cooperation in neonates. Thus, the precision and detail of a CT scan make it the optimal choice for evaluating choanal atresia.