Imaging of granulomatous neck masses in children.

Non-tuberculous mycobacterial (NTM) infection is the most common cause of granulomatous inflammation in pediatric neck masses. Diagnosis relies upon culture, acid-fast bacilli (AFB) staining, chest radiograph, purified protein derivative (PPD) test, and clinical features. Computed tomography (CT) and magnetic resonance (MR) imaging may provide valuable information in the work-up of children with cervical masses. We reviewed 11 CT and 5 MR studies of children with a clinical diagnosis of NTM infection. Specific findings included stranding of the subcutaneous fat, thickening and enhancement of the overlying skin, obliteration of the tissue palnes, and multichambered masses. One patient had calcifications within the mass. MR with contrast better demonstrated the soft tissues and is our recommended imaging modality, although CT is more likely to detect calcifications within the neck mass.