CT Scan and MRI study

🧠 1. Metastasis (Top-Left Panel)
🟡 Imaging Appearance: Shows a large, well-defined mass within the cerebellar hemisphere with peripheral ring enhancement and surrounding swelling.

📝 Key Notes: Text reads: "Adults; Can look like anything"

🩸 2. Hemangioblastoma (Top-Middle Panel)
🔵 Imaging Appearance: Shows a highly vascular, bright solid nodule sitting adjacent to a large, dark fluid-filled cyst cavity.

📝 Key Notes: Text reads: "Adults; Nodule+Cyst"

🌸 3. Pilocytic astrocytoma (Top-Right Panel)
🟢 Imaging Appearance: Similar to hemangioblastoma, it classically presents as a large, dark cystic lesion with a highly enhancing bright mural nodule along its wall.

📝 Key Notes: Text reads: "Children; Nodule+Cyst"

🐯 4. L’Hermitte-Duclos (Bottom-Left Panel)
🟤 Imaging Appearance: Shows an ill-defined thickening of the cerebellar folia with alternating bright and dark bands creating a striated look.

📝 Key Notes: Text reads: "Any age; tigroid pattern" (also known as dysplastic cerebellar gangliocytoma).

❌ 5. Medulloblastoma (Bottom-Middle Panel)
🔴 Imaging Appearance: Displayed on a Diffusion-Weighted Imaging (DWI) MRI scan as a very bright white mass, indicating highly cellular pathology.

📝 Key Notes: Text reads: "Children > adults; diffusion restriction"

📊 Summary Box: Most Frequent Cerebellar Tumor In (Bottom-Right Panel)
The guide provides a quick diagnostic rule of thumb based on patient age:

👴 (Older) adults: metastasis
🧑 (Young to middle aged) adults: hemangioblastoma
👶 Children: pilocytic astrocytoma

🧠 Lateral Temporal Gyri (Left Side)

🔴 Superior temporal gyrus: Highlighted in red at the upper outer portion of the temporal lobe.

➡️ Heschl Gyrus: An arrow points specifically to the upper-back portion of this red region, marking the primary auditory cortex.

🔵 Middle temporal gyrus: Highlighted in blue, located directly beneath the superior temporal gyrus.

🟣 Inferior temporal gyrus: Highlighted in purple at the bottom-left outer edge of the lobe.

🧠 Medial & Ventral Temporal Structures (Right Side)
🟡 Lateral temporo-occipital gyrus: Highlighted in yellow/tan along the lower surface of the brain, transitioning toward the occipital lobe.

🟢 Parahippocampal gyrus: Highlighted in green, located medially next to the lateral temporo-occipital gyrus.

🟤 Hippocampus: Highlighted in brown/orange and marked with an arrow, sitting deeply inside the medial temporal lobe directly above the parahippocampal gyrus.

🧠 Anatomical Structures Involved (Top Panel)

The graphic uses a vertical red shading overlay on the diagram (matching the white area of the stroke on the MRI scan) to show an injury to three specific pathways:

1. Corticospinal tract

2. Medial Lemniscus

3. Hypoglossal nucleus

♿ 1. Contralateral hemiparesis leg & arm
💪 Clinical Presentation: Weakness or paralysis affecting the leg and arm on the opposite (contralateral) side of the body.

🚫 Facial Sparing: The face is spared. This is because motor innervation to the face is handled by the corticobulbar tract and cranial nerves V and VII located higher up in the pons.

🔬 Anatomical Cause: Infarction of the corticospinal tract (labeled as 1. in the upper maroon segment).

🪵 2. Contralateral hemisensory loss
🧠 Clinical Presentation: Loss of specific sensory modalities on the opposite side of the body, explicitly involving vibration, proprioception & fine touch.

🚫 Facial Sparing: The face is spared in this sensory loss as well.

🔬 Anatomical Cause: Infarction of the Medial Lemniscus pathway (labeled as 2. in the central shaded segment).

👅 3. Ipsilateral hypoglossal palsy
👅 Clinical Presentation: Weakness or paralysis of the tongue on the same side (ipsilateral) as the stroke lesion, causing it to typically deviate toward the side of injury.

🔬 Anatomical Cause: Infarction of the Hypoglossal nucleus (labeled as 3. near the back center of the medullary cross-section).

Name of the lesion???

MRI Prostate Cancer and anatomy