A 68-year-old man presents with shoulder pain after many years of repetitive motion. His deformity shares a name with a farm animal, but which one is it?
This deformity is known as the “goat beard deformity” and it’s indicated by the arrow in the first image. More shoulder case review is available at MRI Online.
This 9-year-old presents with an elbow injury from gymnastics. What is the mechanism? What does the solitary arrow indicate? What is the accompanying soft tissue injury? What do the double arrows indicate?
The findings are the result of an acute valgus insult. The capitellum (single arrow) is edematous, a sign of this mechanism. The soft tissue injury is that the ulnar collateral ligament is torn proximally, an unusual injury in a 9-year-old. There is an avulsed ulnar collateral ligament from its origin as stated above (double arrows). For more case review, head to MRI Online.
This 59-year-old woman presents with “fluid behind the ear and ear pain'” for months. Lots of physicians try to pass off a skull base middle ear case to another doctor in their group, but we seek to change that. In image one, the three arrows on the left identify what three regions of the middle ear? In image two, what is the ossicular “joint”? What does the vertical arrow show in image three?
In image one, the three arrows on the left identify epitympanum (upper arrow), mesotympanum (middle arrow) and hypotympanum (lower arrow). The arrow in image two points to the incus-malleus articulation. The arrow in image three shows a dehisced and destroyed tegmen tympani. For more neuro case review, check out MRI Online.
This is a 48-year-old man who fell nine months ago and now has swelling and pain in the right index finger.
- What do the paired arrows label in image 1?
- What does the single arrow label in image 1?
- What does the single vertical arrow label in image 2?
- What do the sets of three paired arrows label in image 2?
- With image three, what do you think is the patient’s story?
- The paired arrows point to a torn ulnar collateral ligament in the first image.
- The single long arrow points to periosteal perpendicular reaction (first image).
- The single vertical arrow (second image) points to an inflamed irregular destructive erosion.
- The multiple short-axis arrows on T1 coronal imaging (second image, three paired arrows) point to extensive periosteal reaction.
- The most plausible explanation for what has happened to this finger is a traumatic injury leading to instability, cartilage injury and collateral ligament injury resulting in chronic indolent infection of the joint space. To back this up, see short-axis axial T2 in which arrows point to a large proteinaceous palmar effusion (short-axis T2 arrows, third image).
- For more case review, head to MRI Online.
This 69-year-old male presents with visual deficit. The finding on CT is a left occipital stroke. In what vascular territory is it distributed? Would the MRI be positive? More specifically, would a FLAIR MRI be positive? What about a diffusion MRI?
The location of the stroke is the left posterior cerebral artery territory. FLAIR MRI would never be normal when CT is positive. It is inordinately more sensitive and positive in the first 24 hours after a stroke. The diffusion MRI is positive even earlier than the FLAIR, as early as three hours.
ProScan Pearl: To find blood in a stroke on MRI, consider blood-sensitive sequences like BSI (Hitachi), SWI (GE), SWAN (Siemens) or Venous BOLD (Philips). Blood in a small stroke may “hide” or obscure diffusion imaging findings – pseudonormality. For more neuro case review, head to MRI Online.
This 57-year-old male presents with a large mass. What is it? But, more importantly, on these axial water-weighted MRI images, what is the potentially life-threatening finding?
The high signal mass is a gastrocnemius semimembranous bursal cyst (one of the many types of Baker’s cysts). The life-threatening finding is the absence of flow phenomena in the popliteal vein. This thrombosis (arrows) can eventually result in a pulmonary embolism. When a Baker’s cyst clinically simulates a popliteal thrombophlebitis, this is called pseudothrombophlebitis. But when it actually coexists with the thrombophlebitis due to compression (as in this case) it is called pseudo-pseudothrombophlebitis.
After you try to say pseudo-pseudothrombophlebitis five times fast, head to MRI Online for more knee case review.
This 10-year-old presents with right knee pain and swelling. There is no known trauma. What’s the most likely diagnosis? What is indicated by the arrows in the back of the knee? Is it concerning?
The diagnosis is Sinding-Larsen-Johansson syndrome or inferior patellar “apophysitis” (yellow arrow). The green arrows indicate lymph nodes, and they are innocuous (since they contain fat in the coronal). It is common to see lymph nodes behind the femur, particularly in children. Of course they are more numerous or larger in patients with inflammatory processes of the knee such as JIA (juvenile idiopathic arthritis).
For more knee case review, visit MRI Online.