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<p><strong>Part 1: Trauma</strong><br>1 Shoulder dislocation<br>2 Distal clavicular erosion<br>3 Widening of acromioclavicular (AC) joint<br>4 Fracture dislocation of forearm<br>5 Carpal dislocation<br>6 Avulsion fracture of finger<br>7 Avulsion fracture of the pelvis<br>8 Widened pubic symphysis<br>9 Pelvic ring disruption<br>10 Avulsion fracture at the knee<br>11 Distal fibular fracture<br>12 Calcaneal avulsion fracture<br>13 Fracture at the base of the fifth metatarsal<br><strong>Part 2: Bone Tumors</strong><br>14 Aggressive periosteal reaction<br>15 Focal cortical thickening<br>16 Epiphyseal equivalent lucent lesion<br>17 Solitary focal sclerotic lesion<br>18 Lesion with permeative or moth-eaten pattern<br>19 Osseous lesion with fluid–fluid levels<br>20 Osseous lesion with chondroid matrix<br>21 Osseous lesion with osteoid matrix<br>22 Polyostotic lesions–looks like a syndrome<br>23 Surface lesion of bone<br>24 Multiple lytic lesions<br>25 Multiple sclerotic lesions<br>26 Expansile lytic lesion of rib<br>27 Ivory vertebral body<br>28 Lytic lesion of distal phalanx<br>29 Anterior tibial cystic appearing lesion<br>30 Lucent lesion in calcaneus<br>31 Diffusely increased bone density<br>32 Well-marginated ossific mass projecting off the surface of the bone (without full-thickness cortical disruption or overlying soft-tissue mass)<br>33 Long lesion in a long bone with ground glass matrix–Roentgen classic<br>34 Bony projection with continuation of cortex and medullary cavity of host bone–Roentgen classic<br>35 Fractured lytic lesion with a fallen fragment–Roentgen classic<br><strong>Part 3: Upper Extremity</strong><br>36 Abnormal/variant appearance of anterosuperior labrum<br>37 Abnormality of inferior glenohumeral ligament<br>38 Abnormality of proximal long head of biceps tendon<br>39 Tear of the anteroinferior labrum<br>40 Bursa or cyst around the shoulder<br>41 Rotator cuff abnormality<br>42 Rotator interval abnormality<br>43 Posterior glenoid labral abnormality<br>44 Nerve entrapment at shoulder<br>45 Nerve entrapment at elbow<br>46 Distal biceps tendon abnormality<br>47 Radial-sided, soft-tissue injury at elbow on MRI<br>48 Osteochondral lesion of elbow<br>49 Ulnar-sided, stabilizer injury at elbow on MRI<br>50 Numerous tiny T2 hyperintense subcutaneous nodules<br><strong>Part 4: Lower Extremity</strong><br>51 Variant sciatic nerve anatomy<br>52 Ischiofemoral space narrowing and quadratus femoris muscle edema in a patient with chronic ischial tuberosity avulsion (nonunion)<br>53 Small smoothly marginated depression ("fossa") at the mid-acetabular roof<br>54 Focal subchondral bone edema in the femoral head<br>55 Low-grade tearing of the iliotibial band (ITB), with soft-tissue edema along the fascia<br>56 Focal periphyseal edema<br>57 Curvilinear signal separating the patella into two fragments<br>58 Frond-like lobules of fatty tissue in the suprapatellar recess, with effusion<br>59 Cystic-appearing lesion centered inferior to the medial joint line of the knee<br>60 Accessory muscle around ankle<br>61 Accessory ossicle around ankle<br>62 Achilles tendon abnormality<br>63 Impingement syndrome at ankle<br>64 Ankle sprain<br>65 Medial tendon abnormality at ankle<br>66 Nerve entrapment around ankle and foot<br>67 Plantar fascial abnormality<br>68 Peroneal tendon disease at the ankle<br>69 Midfoot ligamentous or osseous injury<br>70 Hallux sesamoid abnormality<br>71 Subchondral crescent sign–Roentgen classic<br>72 Fluid collection at the inferomedial aspect of hip–Roentgen classic<br>73 Cleft of T2 hyperintense signal at the attachment of rectus abdominis-adductor aponeurosis–Roentgen classic<br>74 Hamstring tendon discontinuity with subacute hematoma–Roentgen classic<br><strong>Part 5: Arthropathies</strong><br>75 Intense, diffuse, nontraumatic bone and soft-tissue edema centered at the midfoot<br>76 Polyarticular arthritis in an adolescent, with "blooming" intraarticular hemosiderin<br>77 Bilateral sacroiliitis<br>78 Contour defect at the posterolateral humeral head<br>79 Proximal arthropathy affecting primarily the metacarpophalangeal joints.<br>80 Distal arthropathy affecting primarily the interphalangeal joints<br>81 Erosive arthropathy involving the foot<br>82 Acro-osteolysis<br>83 Loose bodies<br>84 Articular cartilage thinning, subchondral cyst formation and dorsal subluxation of the metacarpal base–Roentgen classic<br><strong>Part 6: Infection</strong><br>85 Penumbra sign<br>86 Sequestrum<br>87 Fluid collection with edema at metaphyseal-equivalent location (prior to skeletal maturity)<br>88 Space occupying lesion posterior to olecranon<br>89 Unilateral sacroiliitis<br>90 Epitrochlear lymphadenopathy<br>91 Aggressive, cortically-based osteolysis and periosteal reaction at the diaphysis of an adult long bone<br>92 Abscesses in bone and adjacent to bone, with thin perforations in cortex–Roentgen classic<br><strong>Part 7: Soft Tissue Tumors</strong><br>93 Fusiform mass, with longitudinal "tail" entering and exiting eccentrically<br>94 Complex fluid collection in the bicipitoradial bursa<br>95 Infiltrative intra-articular mass of low-T2 signal intensity, with erosions<br>96 Non-mineralized soft-tissue mass with an infiltrative border ("tail sign") that responds favorably to non-operative treatment<br>97 Post-traumatic fluid-like collection in the deep subcutaneous tissue along the superficial aspect of the fascia<br>98 Large, pendulous mass at the inner thigh in a morbidly obese patient<br>99 Leg, ankle, and foot edema, with prominent thickening and increased density of the subcutaneous fat layer<br>100 Triad of key findings: Pretibial varices, linear cortical defect in mid tibia, and prominent nutrient vein within the mid tibia<br>101 Multiple T2-hypointense masses in the subcutaneous fat layer of the foot<br>102 Large subfascial soft-tissue mass with heterogeneous signal on T1, T2, and post-contrast images<br>103 Rim enhancing mass in iliopsoas<br>104 Infrascapular soft-tissue mass containing diffuse streaks of fatty tissue–Roentgen classic<br><strong>Part 8: Metabolic Musculoskeletal Conditions</strong><br>105 Frayed metaphyses<br>106 Generalized periosteal reaction<br>107 Periarticular calcified mass<br>108 Long bone sclerosis<br>109 Multiple bone infarcts<br>110 Osteoporosis<br>111 Widespread soft tissue calcifications<br>112 Rugger jersey spine<br><strong>Part 9: Spine</strong><br>113 Vertebral body fusion<br>114 Odontoid fracture<br>115 Hyperflexion Injury<br>116 Midline sacral lesion<br>117 Posterior vertebral body scalloping<br>118 Anterior vertebral body scalloping<br>119 Lytic lesion of posterior elements of spine<br>120 Epidural mass<br>121 Diffuse marrow T1 and T2 low signal<br>122 Focal T1 signal increase<br>123 Intradural extramedullary mass<br>124 Intradural intramedullary spinal cord mass<br>125 End plate irregularity<br><strong>Part 10: Pediatric or Developmental Musculoskeletal Conditions</strong><br>126 Short rib skeletal dysplasia<br>127 Abnormal epiphyses<br>128 Limb deficiency<br>129 Genu varum<br>130 Lucent metaphyses<br>131 Dense metaphyses<br>132 Dislocated hip<br>133 Physeal widening<br>134 Hip effusion<br>135 Infrapatellar soft tissue swelling<br>136 Foot deformity<br>137 Soft tissue mass in an infant<br>138 Large soft tissue mass in an older child<br>139 Periosteal reaction in a newborn/infant<br>140 Wormian bones<br>141 Madelung deformity<br>142 Tarsal coalition<br>143 Well-corticated ossific density at the lateral aspect of acromion–Roentgen classic<br>144 Osteoporosis, bowing deformities, and multilevel spine fractures–Roentgen classic<br>145 Decreased lower lumbar interpediculate distances, "tombstone" iliac bones, "champagne glass" pelvic inlet, and rhizomelic limb shortening–Roentgen classic<br>146 Multiple rib fractures in various stages of healing–Roentgen classic</p>

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