pathology exam(1)

the mistake"s"

1. choose the WRONG, not the RIGHT one - Be carefully!

2. Infarcation:
- Red(hemorrhagic) infarct:
more in the lung. It happens in Venous occlusion(ovarian torsion), Dual circulation(lung, small intestine), Loose tissue(lung), Previously congested tissue and Reestablished blood flow to sites of previous art. occlusion and necrosis.

- White(anemic) infarct:
Art. occlusion in solid organs with end-art. circulation. eg. heart, spleen. kidney and brain. And the white infarct usually show in triangle or wedge-shaped sharp margin(very important!!)

So the twisted ovary belongs to the RED infarct!

3. Chronic GVHD means the thymus is distroied, so the central tolerance is missing. At this time autoimmune help T-cells increase, and it causes the autoimmune-like disease. The tissue is infiltrated by lymohocytes and becomes fibrosis.

So the main role here is the helper T cell.