COVID-19 patients at New York’s Mount Sinai Health System, and in that time, she’s begun to notice some patterns.Many of the deceased patients were showing evidence of unusual blood clots in their veins, said Bryce, who is Sinai’s associate director of autopsy service.Some also had lung damage throughout the alveoli — the tiny air sacs branching through your lungs — and the lungs themselves were denser and heavier than normal.“When I looked at the lungs at autopsy, they had a very different look to them,” she said. “In this case, the lungs had an interesting lumpy texture.” Severe COVID-19 patients have ‘unprecedented’ blood clots.