Obliquely orientated comminuted fracture of the right sacral ala with involvement of the sacroiliac joint anteriorly without significant diastasis. The fracture extends distally and involves the right S1-S3 neural foramina. Surrounding haematoma noted. Also swollen right piriformis muscle indicating intramuscular haematoma. No focal contrast blush.
There also comminuted and displaced fractures of bilateral inferior and superior pubic rami. Minor right pelvic side wall haematoma from the pubic fractures.