Gas Gangrene
An elderly woman was sent to the ER by her senior’s residence in the middle of the night for bloody stools. The triage nurse found out that there was no blood but there was pus coming from her rectum. There was a very red and swollen area starting from the anus and extending onto her buttock and lower back. I looked for an abscess with the ultrasound probe. This video shows a quick scan starting in the lower back region (on normal skin). A few seconds later, you can see typical findings of cellulitis and, at the end, gas.
Excellent case and images.