FLEX February 2024

Stern et al

234

Fig. 10. Immature teratoma. Sagittal fat-suppressed T2 ( A ) and coronal fat-suppressed coronal postcontrast T1 ( B ) magnetic resonance images show a bulky T2 hyperintense, heterogeneously enhancing mass in the right neck ( arrows ). No discernible fat is evident in this immature, less differentiated lesion.

Infectious and Inflammatory Lesions Cervical lymphadenitis

Contrast-enhanced CT is useful in the evaluation of infectious and inflammatory processes in the neck, which typically demonstrate infiltration of the fat planes in the involved areas, usually with associated enhancing lymphoid tissue ( Fig. 16 ). Infec tious cervical lymphadenitis can be focal, particularly if bacterial, versus diffuse, particularly if viral in etiology. The presence of periadenitis associated with bacterial lymphadenitis is a helpful feature, which appears as ill-defined T2 hyperintensity and enhancement surrounding the abnormal lymph nodes on MRI ( Fig. 17 ). Mycobac terial (tuberculous or nontuberculous) lymphadenopathy demonstrates clustered

Fig. 11. Thyroglossal duct cyst. Axial ( A ) and reconstructed sagittal ( B ) contrast-enhanced CT images demonstrate a peripherally enhancing cyst in the anterior midline neck, embedded in the strap musculature. The collection abuts the hyoid bone, extending slightly into the posterior hyoid space ( black curved arrow ).

Downloaded for Anonymous User (n/a) at STANFORD UNIVERSITY from ClinicalKey.com by Elsevier on January 02, 2024. For personal use only. No other uses without permission. Copyright ©2024. Elsevier Inc. All rights reserved.