𝖱𝖠𝖣𝖨𝖮𝖫𝖮𝖦𝖸 CORE

𝖱𝖠𝖣𝖨𝖮𝖫𝖮𝖦𝖸 CORE ☢️☢️☢️

😲😲😲 Gallbladder disease 😲😲😲🟢 1. Multiseptated Gallbladder🌱 Multiple thin septations create a characteristic honeycomb ap...
12/06/2026

😲😲😲 Gallbladder disease 😲😲😲

🟢 1. Multiseptated Gallbladder
🌱 Multiple thin septations create a characteristic honeycomb appearance within the gallbladder.

🟡 2. Gallbladder Stone with Acoustic Shadow
🪨 Echogenic gallstone produces a clean posterior acoustic shadow behind it.

🟣 3. Gangrenous Gallbladder
⚠️ Irregular wall disruption, ulceration, and sloughed membranes suggest gangrenous cholecystitis.

🔴 4. Phrygian Cap
🎩 Normal anatomical variant where the fundus folds back on itself.

🟠 5. Gallbladder Sludge
🧈 Low-level echogenic bile sediment settles dependently without acoustic shadowing.

🟢 6. Gallbladder Perforation
💥 Focal gallbladder wall defect with surrounding pericholecystic fluid collection.

🟣 7. WES Sign (Wall-Echo-Shadow Sign)
🪨 Gallbladder lumen is packed with stones, showing wall, echo, and posterior shadow.

🔵 8. Acute Cholecystitis
🔥 Gallbladder wall thickening (>3 mm), often with stones, sludge, and a positive sonographic Murphy sign.

🟠 9. Ball-on-the-Wall Sign
🎯 Small pedunculated gallbladder polyp appears attached to the wall by a stalk.

Molar Tooth Sign (MRI Brain) What is it?A characteristic MRI appearance where the midbrain looks like a “molar tooth” du...
08/06/2026

Molar Tooth Sign (MRI Brain)
What is it?
A characteristic MRI appearance where the midbrain looks like a “molar tooth” due to abnormal brainstem and cerebellar development.

Structures involved:
Thickened & horizontally oriented superior cerebellar peduncles
Deep interpeduncular fossa
Hypoplasia/aplasia of cerebellar vermis

Most likely diagnosis:
👉 Joubert syndrome
Other associated causes:
COACH syndrome
Senior–Løken syndrome
Other ciliopathies

🟡 Reactive vs Malignant Lymph NodeNot every enlarged lymph node is malignant.Reactive nodes may become large, yet preser...
08/06/2026

🟡 Reactive vs Malignant Lymph Node

Not every enlarged lymph node is malignant.

Reactive nodes may become large, yet preserve their normal architecture.

The real clues are:
• Shape
• Fatty hilum
• Cortical morphology
• Vascular pattern

In lymph node ultrasound, morphology often matters more than size.

Building a modern archive of radiology signs and real teaching cases.

🔲 Core Mechanisms (Top Left)🚫 No protons: Tissues lacking hydrogen atoms cannot generate an MRI signal.🧲 Paramagnetic: M...
08/06/2026

🔲 Core Mechanisms (Top Left)

🚫 No protons: Tissues lacking hydrogen atoms cannot generate an MRI signal.

🧲 Paramagnetic: Materials that cause local magnetic field distortions, dropping the signal.

📉 Less protons: Tissues with high cell density or thick protein, resulting in lower water/proton content.

💨 1. No Protons / Signal Void (Top Row)
🌬️ Air (Pneumocephalus): Shows pockets of dark air traps inside the skull cavities (indicated by white arrows).

🌊 Flow (AVM): Shows an Arteriovenous Malformation where rapidly moving blood creates dark "flow voids" in the blood vessels.

🪨 Calcifications (Pineal gland tumor): Highlights a dark cluster of calcium deposits (arrow) within a pineal region mass.

🩸 2. Hemorrhage & Iron Deposition (Middle Row)
🔴 Hemorrhage:

Cerebellar hemorrhage: A large dark area in the cerebellum representing intracellular methemoglobin or hemosiderin from bleeding.

Hemorrhagic metastasis: A dark-rimmed circular tumor lesion (arrow) indicating a bleeding secondary tumor.

🟠 Iron Deposition:

Cavernoma: Shows a classic "popcorn" lesion surrounded by a dark ring of hemosiderosis stained brain parenchyma (arrows).

Superficial hemosiderosis: Displays dark lines coating the surface profile of the brainstem and cerebellum (arrows) after SAB (subarachnoid bleeding).

🧴 3. Mucoid / Protein Containing Lesions (Bottom Left)
🥥 Colloid cyst: A dark, round protein-rich cyst located characteristically at the third ventricle of the brain.

🍇 Mucoid metastasis (coloncarcinoma): A tumor spread from colon cancer that appears dark due to thick, mucinous fluid components.

🧫 4. Hypercellular Tumors (Bottom Right)
🧬 Medulloblastoma: A highly packed, aggressive childhood tumor in the cerebellum that appears dark because cells are crowded together, leaving very little space for water.

🧬 Lymphoma: A dense, cellular brain tumor (arrow) that restricts water content, making it look dark on a T2 sequence.

Basic Ultrasound Understanding and sizes of abdominal Visceras
04/06/2026

Basic Ultrasound Understanding and sizes of abdominal Visceras

Some Brain disease signs
04/06/2026

Some Brain disease signs

🦋 Lambda Sign - Ultrasound (OBS)
01/06/2026

🦋 Lambda Sign - Ultrasound (OBS)

🦆 Donald Duck Sign Rhombencephalosynapsis is a congenital abnormality of the cerebellum characterized by the absence of ...
01/06/2026

🦆 Donald Duck Sign

Rhombencephalosynapsis is a congenital abnormality of the cerebellum characterized by the absence of the vermis and continuity of the cerebellar hemispheres, dentate nuclei, and superior cerebellar peduncles. It occurs as an isolated anomaly (rare) or as part of a wider cerebral malformation and has variable degrees of neurological impairment.

FLAIR (Fluid-Attenuated Inversion Recovery) MRI is an imaging technique used to suppress the signal from fluids in the b...
31/05/2026

FLAIR (Fluid-Attenuated Inversion Recovery) MRI is an imaging technique used to suppress the signal from fluids in the body and improve the contrast between fluids and surrounding tissues.

The physics behind FLAIR MRI involves the use of an inversion recovery pulse sequence. In this sequence, a 180-degree radiofrequency pulse is used to invert the magnetization of the protons in the imaged tissue. This is followed by a delay, known as the inversion time (TI), during which the protons are allowed to recover some of their longitudinal magnetization.

LUMBAR SPINE OBLIQUE VIEW🔰:•An oblique view of the lumbar spine is a specialized X-ray projection taken at an angle (typ...
31/05/2026

LUMBAR SPINE OBLIQUE VIEW🔰:
•An oblique view of the lumbar spine is a specialized X-ray projection taken at an angle (typically 35° to 45°) to visualize structures that are obscured on standard front-to-back (AP) or side-on (lateral) images...
• It is the primary radiographic method for evaluating the pars interarticularis and the facet (zygapophyseal) joints...
•The hallmark of a properly positioned oblique lumbar X-ray is the Scottie dog sign, where the posterior elements of the vertebrae align to resemble the profile of a Scottish Terrier...

POSITIONING🔰:
•The patient is rotated 35°-45° from the table. A 35° angle is often preferred for average patients, while 45° may be better for very slender individuals...
•Posterior Oblique (LPO/RPO): Visualizes the facet joints on the downside (the side closest to the film)...
•Anterior Oblique (LAO/RAO): Visualizes the facet joints on the upside (the side farther from the film)...

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