How would you describe the mineralization pattern within this mass?
Ring and arc pattern
How many osteochondromas can you count?
5, but 6 if you include the one that likely led to the pelvic mass.
What bovine sign is used to describe the appearance of a femoral neck that is enlarged by a sessile osteochondroma(s)?
Brahaman bull appearance. This breed of bull has a large, thick neck, similar to the right femoral neck in this patient.
There is a large mass within the pelvic outlet which demostrates a fine ring and arc pattern pattern of calcification. The mass occupies the majority of the diameter of the pelvic basin.
Note that there are multiple sessile osseous escresences along the proximal right femur including the proximal right femoral neck (Brahman bull appearance) and metaphysis, as well as pedunculated excressences at the lesser trochanter and femoral neck on the left, and anterolateral ilium on the right. These excressences demonstrate medullary continuity with their parent site.
- X-ray (Pelvic outlet view):