CT perfusion. CBF. Brain #Stroke. | Figure 1

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CT perfusion. CBF. Brain #Stroke.

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Axial diffusion-weighted image (image 1) shows a region of restricted diffusion corresponding to the vascular territory of the middle cerebral artery. The region is hypointense on T1-weighted imaging (arrow, image 2). On perfusion imaging (arrow, image 3), there is increased perfusion in the area of affected by the stroke consistent with luxury perfusion. Luxury perfusion is defined as "excessive brain blood flow in demand of the metabolic rate and oxygen demand of the brain tissue. It is nonnutritive flow to the infarcted tissue because of abnormal autoregulation system." It occurs after recanalization of a thrombosed artery and is thought to represent dysfunctional vascular autoregulation. #NeuroWednesday



non-contrast axial ct head: what is the abnormality and what does it indicate? What additional study(s) do you want to see? What treatment can this patient receive?](https://app.figure1.com/case-detail/115cbd38-7c6c-4124-b7c0-189ed6867740)



Axial non-contrast CT demonstrates abnormal decreased attenuation (arrow) within the left middle cerebral artery territory and a smaller area of decreased attenuation (arrowhead) within the anterior right middle cerebral artery territory. Pediatric stroke, though uncommon, presents differently in children compared to adults. In neonates, the most common symptom is seizure, while older children more frequently show focal deficits. However, seizures also occur in approximately 40% of older children. Common risk factors include vasculopathies, infections, cardiac conditions, and coagulopathies.



FU for 75 yo AA male with appx 90% stenosed RICA. 8-10/40 mm stent placement with reperfusion. It is still unclear exactly where the collaterals were coming from to feed the left brain.](https://app.figure1.com/case-detail/44cdcefa-ca9f-4012-9019-77f47a946b39)



A 52-year-old man presented with a 20-minute history of chest pain radiating to the left shoulder and neck, associated with dyspnea and diaphoresis. He had a history of hypertension, long-term smoking, and a sedentary lifestyle. On physical examination, bibasilar crackles were noted on lung auscultation. An electrocardiogram (ECG) was performed in the primary care setting, and the patient was promptly referred to the emergency department.



A 28-year-old woman presented with a 3-day history of intense pruritus over the lower back. She reported no recent travel or exposure to new environments. She cares for a small kennel with approximately eight dogs rescued from the streets. Physical examination revealed multiple small vesicles, some clustered and others scattered, predominantly involving the lumbar region and the left gluteal area.](https://app.figure1.com/case-detail/c271070f-2bc7-4052-9895-635277e1a7d5)



A 4-month-old male infant presented with skin lesions localized to the chin for the past 3 days. Physical examination revealed multiple small pustules with surrounding inflammatory signs on the chin, along with a few scattered papules on the chest.](https://app.figure1.com/case-detail/48f41642-b9db-4089-b120-a94ee52328de)



patient in late teens presenting after a collapse, no chest pain, no previous cardiac history, no history of sudden death in family, are there any features in this ekg that would warrant further work-up or is this just a pediatric ekg?](https://app.figure1.com/case-detail/2af390e1-ace8-40ed-ba1c-98fb2d72f4c5)