Cortical pseudolaminar necrosis

Lore & Background

Histologically, grey matter is more vulnerable than white matter to necrosis due to lack of oxygen, with the third layer of the grey matter being the most vulnerable. Damage is greater in the sulci when compared to the gyri of the brain. On CT scan, it shows hyperdensity in the surface of the cortex, with cortical enhancement appearing after two weeks, reaching maximum intensity at one to two months, and resolving after six months.

Reader's Guide

Cortical pseudolaminar necrosis is significant as a marker of severe hypoxic-ischemic brain injury, providing a distinct pathological pattern that aids in diagnosis and understanding of cerebral damage. Its characteristic band-like necrosis, sparing the outermost cortical layer, reflects the differential vulnerability of cortical layers to oxygen deprivation. Imaging findings, such as hyperdensity on CT and T1 intensity changes on MRI, allow for temporal tracking of the injury, with enhancement peaking at one to two months and resolving by six months. This condition underscores the selective vulnerability of grey matter, particularly the third layer, and the greater damage in sulci versus gyri, offering insights into the pathophysiology of conditions like status epilepticus and stroke. Its legacy lies in its utility for both clinical diagnosis and neuropathological research into hypoxic-ischemic encephalopathy.

Did You Know?

• The third layer of the grey matter is the most vulnerable to necrosis in this condition.
• On CT scan, cortical enhancement appears after two weeks, with maximum intensity at one to two months.
• On MRI, cortical laminar necrosis typically shows high T1 signal in the subacute stage, not low T1 intensity initially.