Part I: Anatomy and Histology of the Synovium -- Normal Anatomy and Histology -- Part II: Classification, Pathology, Genetics and Molecular Biology -- Classification of Synovial Tumors According to WHO 2020 -- Pathology, Genetics and Molecular Biology -- Part III: Imaging Modalities -- Ultrasound of Synovial Tumors and Tumorlike Conditions -- Radiography and CT in Synovial Tumors and Tumorlike Conditions -- Magnetic Resonance Imaging of Synovial Tumor and Tumorlike Conditions -- PET/CT in Synovial Tumors and Tumor-Like Conditions -- Diagnostic Algorithm of Synovial Tumors and Tumor-Like Conditions -- Part IV: Imaging of Synovial Tumors and Tumor-like Conditions of the Synovium -- Synovial Chondromatosis -- Tenosynovial Giant Cell Tumor -- Lipoma Arborescens -- Synovial Hemangioma -- Synovial Chondrosarcoma -- Synovial Metastasis and Lymphoma -- Synovial Amyloidosis -- Synovial Cysts, Ganglion Cysts, and Bursae -- Mimics of Synovial Tumors Due to Trauma and Inflammation.-Mimics of Synovial Tumors Due to Chronic Infection -- Part V: Treatment of Synovial Tumors and Tumor-like Conditions of the Synovium -- Surgical Treatment -- Nonsurgical Treatment. .