Tumors and Tumor-like Lesions

Benign and malignant bone and soft tissue tumors of the hip, while only accounting for a relatively small proportion of neoplasms overall, are not uncommonly identified during imaging of the hip. It is important for the radiologist to have a sound understanding of these neoplastic lesions and their imaging features, both incidental and suspected, as imaging plays a crucial role in their diagnosis and investigation and guiding appropriate management. Moreover, certain non-neoplastic conditions may mimic tumors which can serve as potential pitfalls, and correct identification of these entities is critical in order to avoid unnecessary investigations which may cause harm and distress to patients. A wide range of bone and soft tissue tumors have been identified and classified according to the most recent World Health Organization (WHO) classification of tumors published in 2020. Due to the wide range of conditions described so far, it is not possible to provide an all-encompassing review of the bone and soft tissue neoplasms that may affect the hip. This chapter delves into the commonly seen tumors and tumor-like lesions affecting the hip, providing an overview of the commonly encountered lesions. Particular attention is given to the imaging characteristics of the various lesions, which can aid in the differential diagnosis. Real-world examples of images have been included to illustrate key points and salient imaging features.