Arteriovenous malformations (AVMs) are congenital lesions which result from abnormal communication between arterial and venous vessels directly without an intervening capillary bed. They may present as pulsatile subcutaneous mass which may bleed or ulcerate.
The respiratory capillaries were surrounded by a rich blood capillary bed. Ghrelin-ip cells were located among the tertiary bronchus mucosal epithelial cells, respiratory capillary epithelial cells and macrophages.
McDougall, Anderson, Chaplain, and Sherratt (2002) simulated blood flow and drug delivery through the vascular network from a nearby parent vessel to the tumor surface via an associated capillary bed generated from their mathematical model of tumor-induced angiogenesis.
described two patients who initially presented with a CRVO and then developed a subsequent CRAO, suggesting that increased venous pressure could cross the capillary bed to impede the arterial flow and cause ischemia .