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Background
Pelvic and hip musculoskeletal masses often present a diagnostic challenge due to the complexity of the anatomy and the variety of pathological processes. An understanding of the various pathologies by tissue of origin that preferentially arise at the pelvis and hip and their tissue of origin is critical in formulating a sound differential diagnosis. Additional accurate localization of musculoskeletal masses of the pelvis and hip and identifying aggressive features can provide valuable clues to guiding management, specifically the need for a biopsy. This educational exhibit aims to provide a diagnostic approach to musculoskeletal masses of the pelvis and hip that is based on the tissue of origin as well as identify unique features of various pathologies.

Educational Goals / Teaching Points
This exhibit will present multiple home institution cases of pelvic and hip pathology of varying tissue origin and benignity across multiple imaging modalities. Unique identifying features will be highlighted as well as mention of potential differential diagnoses and treatment options.

Key Anatomic/Physiologic Issues and Imaging Findings/Techniques
Understanding the complex anatomy of the pelvis and hip is critical not only to formulate a differential diagnosis, but also to guide treatment decisions and surgical management as masses can often affect neurovascular structures given the proximity to the lumbosacral plexus and sciatic nerve. A multiple imaging modality approach with radiographs, CT, MRI, and PET/CT is often needed to diagnose pelvic and hip masses.

Conclusion
Pelvic and hip musculoskeletal masses can often be daunting to the radiologist. An understanding of the anatomy, tissue origins of the more common benign and malignant pathologies, and unique imaging features can help the radiologist provide a focused differential diagnosis.