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FIGURE 3. Pelvic AHO with soft-tissue abscess. (A) Tissue- and skeletal-phase images show high tracer localization and uptake extending from left anterosuperior to anteroinferior iliac spine of 9-y-old boy. MRI was requested to assess for possible abscess because of pelvic location of presumed AHO. (B) Coronal gadolinium-enhanced fat-suppressed T1-weighted MR image shows enhancement of ilium corresponding to abnormality shown by scintigraphy. Within enhancing region is nonenhancing area consistent with intraosseous abscess (long arrow). Lobulated rim-enhancing abscess is also present in proximal left musculus gluteus minimus adjacent to anterosuperior iliac spine (short arrow). Note that scintigraphic tissue-phase image also shows subtle degree of high soft-tissue tracer localization in this region. Percutaneous abscess drainage was performed.
