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.

34 M. Trauma due to falling off a roof. Diagnosis? • Xray of the Week Figure 1. Trauma due to falling off a roof. Diagnosis? Figure 2. Type B2 Lisfranc injury. (A) AP radiograph demonstrates the circled “fleck sign” or Lisfranc ligament avulsion fracture fragment. (B) Arrow demonstrates the increase in distance between the first and second metatarsals. The red lines show the misalignment or lateral displacement of the 2nd metatarsal bone over the second cuneiform bone and the

79 year old male. Back pain and lower extremity weakness after a fall • Xray of the Week Figure 1.What are the important findings in each...