Intraretinal haemorrhages occur when aggregated sickled red blood cells abruptly occlude an arteriole, resulting in ischaemic necrosis
and 'blowout' of the vessel wall.
Calciphylaxis as a rare pathological and clinical entity generally develops in patients with renal failure, chronic dialysis and multiple factors aggravating arterial calcification and progressive peripheral ischaemic necrosis
The high pressure in the cuff compresses the mucosa against the rigid tracheal cartilage rings, resulting in mucosal damage and ischaemic necrosis
Zeek and Assali (1950) (9) defined placental infarction as a zone of ischaemic necrosis
of a group of villi due to complete interference with their blood supply in the deciduas, thrombosis of a spiral arteriole or a retroplacental haemorrhage.
DUE TO NON-INFLAMMATORY VASCULAR OCCLUSION
However, case reports of significant complications have been documented, including necrotising fasciitis, urine retention and ischaemic necrosis
of the glans.
We particularly noted lesions in the central system of moose that were characterized by nonpurulent meningo-encephalitis, edema, perivasculitis in extracellular spaces, and focal ischaemic necrosis
because of thrombosis of small vessels.
Causes of digital ischaemic necrosis
are most commonly due to vasculitis, either autoimmune or drug-induced.