A 15-year-old female Gymnastics injury. Diagnosis? • Radiology Case of the Week Figure 1. A 15-year-old female Gymnastics injury. Diagnosis? Figure 2. A. Cross-table lateral radiograph of the left knee. The patella (red arrows) is projected over the anterior femoral condyles (yellow arrow). B. Anteroposterior radiograph of the left knee. The patella (red arrows) is displaced laterally and lies beside the lateral femoral condyle (yellow arrow). C. Axial patellofemoral view of

A 23-Year-Old female at First-Trimester Ultrasound. Diagnosis? • Radiology Case of the Week Figure 1. Transabdominal first-trimester pelvic ultrasound. 23-year-old patient presenting with vaginal bleeding: Diagnosis? Figure 2. A. Magnified sagittal ultrasound of the cystic structure shows a thin, complete outer wall (red arrow) and an internal septation (yellow arrow) crossing the cyst; ultrasound calipers measure 1.6 x 1.2 cm. Fetal pole (green arrow) is seen with the cysti

Adolescent with Chronic Neck Pain and Suboccipital Discomfort: Diagnosis? • Xray of the Week Figure 1. CT images of the cervical spine (A) sagittal view and (B) coronal view. What is the important finding on this CT scan? Figure 2. A. Sagittal CT shows a small, round, well-corticated ossicle (yellow arrow) representing the os odontoideum separated from the underlying body of C2 (green arrow). Note the smooth, radiolucent gap between the body of C2 and the os odontoideum (red

Trauma due to motor vehicle collision. Diagnosis? • Xray of the Week Figure 1. CT images of the cervical spine (A) sagittal view and (B) coronal view. What is the important finding on this CT scan? Figure 2. CT scan of a Type I dens fracture. Red arrows point to the fracture line at the tip of the dens. Figure 3. Anderson and D’Alonzo dens fracture classification system. Diagram by Neal Joshi. Type I is an oblique avulsion fracture involving the upper tip of the dens, usual

Conventional osteosarcoma typically appears as an aggressive metaphyseal lesion with mixed lytic and sclerotic components, cortical destruction, an ill-defined zone of transition, mineralized osteoid matrix, and an associated soft-tissue mass. Aggressive periosteal reactions, including sunburst-type spiculation and a Codman triangle, may occur.

A 70-year-old female fell off her bed while changing a light bulb and complains of left shoulder pain. What is the diagnosis? • Xray of the Week Figure 1. Non-contrast CT of the cervical spine. What is the diagnosis? Figure 2. Non-contrast CT of the cervical spine (sagittal reconstructions): Bilateral facet dislocation at C7-T1 with anterior subluxation of C7 on T1. The inferior facets of C7 are locked anterior to the superior facets of T1 (yellow and green arrows), with ante

50-year-old female presenting with short 5th finger . What is the diagnosis? • Xray of the Week Figure 1. Frontal bilateral hand X-ray. What is the diagnosis? Figure 2. Frontal bilateral hand X-ray: Severe shortening of the middle phalanx of the fifth digit (red arrows). The phalanx measures less than 50% of the length of the adjacent fourth middle phalanx, satisfying the Hertzog criteria for Brachydactyly Type A3. A mild radial clinodactyly is present, secondary to the wedg

An 74-year-old male with chronic low back pain and progressive lower extremity weakness. What is the diagnosis? • Xray of the Week Figure 1. Non-contrast CT of the lumbar spine. What is the diagnosis? Figure 2. Non-contrast CT of the lumbar spine (axial, sagittal, and coronal reconstructions): Central pattern of arachnoiditis ossificans demonstrating dagger-like ossification within the central spinal canal at the L5 level (red arrows). The linear, hyperdense bony bar courses

26 M jumped to catch a baseball and landed while rotating to the right. Diagnosis? • Xray of the Week

This prestigious award is given by Professor Resnick to the winner of his annual MSK imaging quiz.