Radiology Key

Hypoechoic Muscle Mass DIFFERENTIAL DIAGNOSIS Common • Hematoma • Muscle Tear • Nerve Sheath Tumor Less Common • Soft Tissue Sarcoma • Myxoma • Fibromatosis • Abscess • Metastases • Lymphangioma • Intramuscular Extension of Baker Cyst • Vascular Malformation • Local…

Shoulder IMAGING ANATOMY Overview • Rotator cuff  Consists of supraspinatus, infraspinatus, teres minor, subscapularis muscles, and tendons  Cuff tendons blend with shoulder joint capsule  Supraspinatus and infraspinatus tendons are inseparable at…

Postoperative Infection KEY FACTS Terminology • Infection at surgical site within 1 month of surgery or within 1 year of prosthetic implantation Imaging • Mild soft tissue edema, fluid, & hyperemia are…

Bone Surface Lesion DIFFERENTIAL DIAGNOSIS Common • Osteochondroma • Other Benign Bone Tumor • Malignant Bone Tumor Less Common • Metastases • Bone Tumor Recurrence • Acute Osteomyelitis • Chronic Osteomyelitis • Fracture • Orthopedic Implant • Cortical Tug Lesion…

Fascial Lesion DIFFERENTIAL DIAGNOSIS Common • Plantar Fasciitis • Plantar Fibromatosis Less Common • Plantar Fascial Tear • Enthesopathic Fasciitis • Investing Fascial Tear • Nodular Fasciitis • Infective Fasciitis • Necrotizing Fasciitis • Eosinophilic Fasciitis • Dupuytren Disease • Tumors…

Hematoma/Seroma KEY FACTS Imaging • Hematoma: Acute  Quite well-defined heterogeneous mass ± echogenic pseudosolid appearance  Multilaminated whorled appearance  Anechoic cystic areas  Echogenic foci due to gas locules  Surrounding soft tissue edema…

Foot Ultrasound KEY FACTS GENERAL CONSIDERATIONS • Common specific indications: Suspected plantar fasciitis and fibroma, Morton neuroma, ganglia, osteoarthritis, gout, and other joint disorders • Less common specific indications: Suspected ligament injury,…

Hyperechoic Muscle Mass DIFFERENTIAL DIAGNOSIS Common • Intermuscular Lipoma • Intramuscular Lipoma • Muscle Edema • Vascular Malformation • Hematoma Less Common • Foreign Body • Soft Tissue Sarcoma • Muscle Metastases • Local Recurrence • Fibromatosis • Peripheral Nerve Sheath…

Soft Tissue Sarcoma KEY FACTS Terminology • Malignant tumor arising from connective (mesenchymal) tissue other than bone Imaging • Large, heterogeneous, hypoechoic mass  Vast majority are located in deep (subfascial) tissues • Most…

Cystic Soft Tissue Mass DIFFERENTIAL DIAGNOSIS Common • Ganglion Cyst • Bursal Distension Less Common • Abscess • Hematoma • Seroma • Baker Cyst • Dermoid/Implantation Dermoid • Parameniscal Cyst • Metastasis • Vascular Anomaly • Lymphatic Malformation • Fat Necrosis • Schwannoma…