TeleFast Rad

↕️🔁 Normal Pressure Hydrocephalus (NPH); Radiological Aspects☢️👁️‍🗨️

📌NPH is a potentially reversible cause of dementia, characterized by the classic clinical triad:
* Gait disturbance (earliest and most prominent)
* Cognitive impairment
* Urinary incontinence
🚨 Radiology plays a central role in diagnosis, patient selection for shunting, and excluding mimics.
⸻
☢️1. CT and MRI Findings

🔻A. Ventriculomegaly (Essential Finding)
* Enlargement of the lateral and third ventricles
* Disproportionate to the degree of cerebral atrophy
* Fourth ventricle may be mildly enlarged

☑️B. Evans Index
The most widely used quantitative measurement.
📌Evans Index =
Maximum width of frontal horns ÷ Maximum internal skull diameter
* Normal: 0.33 are highly abnormal.
⸻
📐C. Callosal Angle (MRI Coronal)
Measured on a coronal image perpendicular to the AC-PC line at the level of the posterior commissure.
* Normal: 100–120°
* NPH: 50–80°
* Helps distinguish NPH from ex-vacuo ventriculomegaly.
Smaller callosal angle strongly favors NPH.
⸻
✅D. DESH Pattern
(Disproportionately Enlarged Subarachnoid Space Hydrocephalus)
One of the most characteristic MRI findings.
✳️Features include:
* Ventriculomegaly
* Dilated Sylvian fissures
* Tight high-convexity sulci
* Tight medial subarachnoid spaces
This pattern strongly supports NPH.
⸻
↗️E. Temporal Horn Enlargement
Early enlargement of the temporal horns;
Usually:
* 2 mm
* Not explained by hippocampal atrophy
⸻
⚠️F. Periventricular White Matter Signal
MRI:
* Periventricular T2/FLAIR hyperintensity
* Represents transependymal CSF flow and chronic ischemic change
May decrease after successful shunting.
⸻
🌀G. Bowing of Corpus Callosum
Upward elevation and thinning due to enlarged ventricles.
⸻
☢️↕️2. CSF Flow MRI (Phase-Contrast MRI)
Can demonstrate:
* Increased aqueductal CSF velocity
* Increased aqueductal stroke volume
⸻

🚨📌Differential Diagnosis⁉️
❇️Radiologically distinguish NPH from:
* Alzheimer disease
* Vascular dementia
* Ex-vacuo ventriculomegaly
* Obstructive hydrocephalus
* Long-standing overt ventriculomegaly in adults (LOVA)
* Chronic communicating hydrocephalus after subarachnoid hemorrhage or meningitis
⸻

🔻☢️High-yield radiology pearls
* DESH is one of the most specific imaging patterns for idiopathic NPH.
* Evans index ≥0.30 supports ventriculomegaly but is not diagnostic by itself.
* Callosal angle

تبحث عن تقارير لمفراس القلب coronary CT او رنين القلب Cardiac MRI؟
نقدم لك خدمة كتابة تقارير عالية الجودة بسرعة ودقة وتفاصيل بواسطة اختصاصين استشاريين ذوي خبرة.
تواصل معنا الآن
+971506093193

☢️ Diaphragmatic movement assessment by US & its clincical relevance ‼️

✅Chest ultrasound for assessment of diaphragmatic movement is a simple, bedside, non-invasive method commonly used in critically ill patients, postoperative patients, and those with suspected diaphragmatic dysfunction.

🔊Technique

* Use a low-frequency curvilinear or phased-array probe (2–5 MHz).
* Place the probe in the subcostal or lower intercostal region.
* The liver (right side) and spleen (left side) serve as acoustic windows.
* Assess the diaphragm in:
* B-mode (visualization of diaphragm motion)
* M-mode (measurement of excursion)

👁️‍🗨️What to Evaluate❓

❇️1. Diaphragmatic Excursion

Measure the distance the diaphragm moves during respiration.

↔️Normal values (approximate):

* Quiet breathing:
* Men: 1.5–2.5 cm
* Women: 1.0–2.0 cm
* Deep inspiration:
* Usually >3.5–4 cm
* Can reach 7 cm or more in healthy individuals

❇️2. Direction of Motion

* Normal: diaphragm moves toward the probe during inspiration.
* Paradoxical motion: diaphragm moves away from the probe during inspiration, suggesting diaphragmatic paralysis.

🔊👁️‍🗨️Ultrasound Findings

✅Normal diaphragm:
The diaphragm demonstrates normal caudal movement during inspiration with adequate excursion and normal thickening of the muscle during inspiration.

✅Diaphragmatic weakness:
There is reduced diaphragmatic excursion and a decreased thickening fraction, indicating impaired contractility. Motion remains in the normal direction but is diminished.

✅Diaphragmatic paralysis:
The diaphragm shows absent or markedly reduced excursion. During inspiration, paradoxical motion may be observed, with the diaphragm moving cranially rather than caudally.

✅Diaphragmatic eventration:
The hemidiaphragm appears elevated; however, diaphragmatic motion is generally preserved, helping differentiate it from paralysis.

✅Ventilator-induced diaphragmatic dysfunction:
The diaphragm demonstrates reduced thickening during inspiration, reflected by a low thickening fraction, suggesting diaphragmatic muscle weakness or atrophy.

👁️‍🗨️©️Clinical Applications

🔻Chest ultrasound assessment of diaphragmatic movement is valuable for predicting successful weaning from mechanical ventilation, evaluating suspected diaphragmatic paralysis or weakness, assessing diaphragmatic function after cardiac or thoracic surgery, investigating neuromuscular disorders affecting respiration, and monitoring recovery or progression of diaphragmatic dysfunction over time.

☢️Role of Neonatal Chest Ultrasound in Pneumothorax☢️

🔻Neonatal chest ultrasound (lung ultrasound, LUS) has become an important bedside tool for diagnosing and monitoring neonatal pneumothorax. It is especially valuable in NICU settings because it is rapid, radiation-free, portable, and highly accurate.

✅Why ultrasound is useful in neonates❓

🔻Thin neonatal chest wall and small lungs provide excellent acoustic windows.
🔻Can be performed at the bedside without transporting unstable infants.
🔻Avoids repeated ionizing radiation from serial chest radiographs.
🔻Provides immediate dynamic assessment in emergency situations.
⸻
☢️Ultrasound Signs of Pneumothorax‼️

🔻1. Absent Lung Sliding

Normally, the visceral and parietal pleura slide against each other during respiration.

👁️‍🗨️In pneumothorax:

* Air separates the pleural layers.
* Pleural sliding disappears.

This is usually the first sign searched for.
⸻
🔻2. Absence of B-Lines

Normally, vertical reverberation artifacts called B-lines arise from the pleura.

In pneumothorax:

👁️‍🗨️* B-lines disappear because air in the pleural space blocks transmission.

Presence of B-lines essentially excludes pneumothorax at that point.

⸻
🔻3. Presence of A-Lines

A-lines are horizontal reverberation artifacts.

👁️‍🗨️In pneumothorax:

* Prominent A-lines with absent lung sliding are typical findings.

⸻

🔻4. Lung Point (Most Specific Sign)✅

The “lung point” represents the transition between:

* Normal lung contact with chest wall
* Pneumothorax region

☑️It is considered highly specific for pneumothorax.

☢️M-Mode Findings‼️

Normal: Seashore Sign

* Granular appearance below pleural line due to lung motion.

👁️‍🗨️Pneumothorax: Barcode / Stratosphere Sign

* Parallel horizontal lines throughout image due to absent motion.

✅Diagnostic Accuracy❓‼️

Neonatal lung ultrasound has:

* Very high sensitivity and specificity
* Often superior sensitivity compared with chest radiography for small pneumothoraces
* Rapid detection in critically ill neonates

👁️‍🗨️Reported studies commonly show sensitivity and specificity approaching or exceeding 90–95%.

☑️ Key Takeaway

🔻The combination of:

* absent lung sliding,
* absent B-lines,
* prominent A-lines,
* and especially the lung point sign

☢️Role of ultrasound in neonatal septic arthritis☢️

✅Ultrasound plays a key, often first-line role in evaluating neonatal septic arthritis, especially because clinical signs can be subtle and early diagnosis is critical to prevent joint destruction.

🔻1. Early detection of joint effusion

* Ultrasound is very sensitive for detecting even small joint effusions (before X-ray changes appear).
* In neonates, the most commonly affected joint is the hip.
* Findings:
* Anechoic or complex fluid in the joint
* Joint capsule distension
* This is often the earliest imaging sign.

⸻

🔻2. Characterization of the effusion

* Helps differentiate:
* Simple (transudate-like) vs
* Complex fluid (suggestive of infection)
* Suspicious features:
* Internal echoes
* Septations
* Debris or pus
* However, ultrasound cannot definitively distinguish septic from sterile effusion → aspiration is needed.

⸻

🔻3. Guidance for diagnostic aspiration

* One of the most important roles
* Ultrasound-guided aspiration:
* Confirms diagnosis (via culture, Gram stain)
* Relieves pressure (especially in hip joint)
* Improves accuracy and safety compared to blind aspiration

⸻

🔻4. Assessment of adjacent soft tissues

* Detects:
* Synovial thickening
* Capsular hyperemia (with Doppler)
* Surrounding cellulitis or abscess
* Helps identify associated osteomyelitis, which is common in neonates due to transphyseal vessels

⸻

🔻5. Monitoring response to treatment

* Serial ultrasound can:
* Track reduction in effusion
* Detect persistent or re-accumulating fluid
* Useful in guiding need for repeat aspiration or surgery

⸻

🔻6. Screening tool in suspected cases

* Ideal because it is:
* Bedside, portable
* No radiation
* Non-invasive
* Especially valuable in unstable neonates

⸻

‼️ Limitations

* Operator-dependent
* Cannot assess bone marrow → MRI is superior for:
* Early osteomyelitis
* Deep soft tissue extension
* Cannot confirm infection without aspiration

⸻

❇️Bottom line

Ultrasound is essential for early detection, guidance of aspiration, and follow-up in neonatal septic arthritis, but definitive diagnosis relies on joint fluid analysis, and MRI complements ultrasound when complications are suspected.

⸻

⚠️Pelvic Congestion Syndrome⚠️
It is a cause of chronic pelvic pain due to dilated, incompetent pelvic veins—basically the pelvic version of varicose veins.

🔻☢️ Radiological Diagnosis☢️🔻

🥇 1️⃣ Catheter Venography (Gold Standard)

This is the definitive radiologic test and is usually performed when embolization is planned.

🔻Diagnostic Venographic Criteria:

✔ Ovarian vein diameter > 6 mm
✔ Reflux of contrast in the ovarian vein (especially left)
✔ Filling of dilated, tortuous pelvic venous plexus
✔ Delayed contrast clearance (venous stasis)
✔ Cross-pelvic filling of contralateral veins
✔ Opacification of v***ar, perineal, or thigh varices from pelvic veins

⸻
🥈 2️⃣ Transvaginal Doppler Ultrasound (First-Line Imaging)

Best initial, noninvasive modality.

🧠 Key point: Demonstration of reflux is more important than size alone.

Dynamic exam (upright or semi-erect + Valsalva) improves sensitivity.
⸻

🥉 3️⃣ MRI (Best Cross-Sectional Modality)

Great for confirming venous congestion and excluding other causes of pelvic pain (endometriosis, adenomyosis).

🔻MRI Findings Suggestive of PCS

✔ Multiple serpiginous flow voids around uterus and ovaries
✔ Dilated ovarian vein:
• Commonly > 8 mm
✔ Engorged parauterine and parametrial veins
✔ High-signal intensity slow flow on T2
✔ Enhancement of dilated veins post-contrast
✔ Varices extending to v***a or pelvic sidewall
⸻
4️⃣ CT Scan

Less preferred (radiation, supine position reduces venous distension) but often shows PCS incidentally.

🔻CT Features

✔ Dilated ovarian vein (>8 mm often used)
✔ Multiple tortuous enhancing veins in adnexa
✔ Congested uterine/ovarian plexus
✔ Pelvic varices crossing midline

⸻
⚠️ Important Radiology Pitfalls

🔴 Vein size alone is NOT diagnostic
Many women without symptoms have large ovarian veins.

🔴 Supine imaging underestimates reflux
Ultrasound with Valsalva is more sensitive.

🔴 Must correlate with chronic pelvic pain pattern

⚠️☢️Role of interventional radiology in PCS
Interventional radiology is basically the main character in treating Pelvic Congestion Syndrome now — both diagnosing it definitively and fixing the problem in the same sitting.
⸻
🎯 Main Role of IR in PCS:

🥇 1️⃣ Diagnostic Confirmation

Although US/MRI suggest PCS, IR confirms it with venography:
• Selective catheterization of ovarian veins (usually left first)
• Sometimes internal iliac veins
• Demonstrates:
• Venous reflux
• Dilated tortuous pelvic plexus
• Cross-pelvic collateral flow
• Delayed emptying
⸻
💉 2️⃣ Definitive Treatment — Pelvic Vein Embolization

This is now the treatment of choice for PCS.

🔧 What is embolized?
• Refluxing ovarian vein(s)
• ± Internal iliac vein branches (uterine, obturator, pudendal) if contributing

🔻Goal: eliminate reflux and decompress pelvic venous plexus
⸻

☢️ Variants holding the name“Horseshoe“ rarher than the famous “ Horseshoe Kidney”..?!🤔🧲

🫁 Thorax / Lungs

🔻Horseshoe lung
• Rare congenital anomaly
• The right and left lungs are connected by a band of lung tissue (isthmus) behind the heart
• Strongly associated with scimitar syndrome

⸻

🧠 Brain

🔻Horseshoe-shaped lateral ventricles
• Seen in agenesis of the corpus callosum
• The lateral ventricles run parallel and curve in a crescent/horseshoe configuration

⸻

🧬 Adrenal glands

🔻Horseshoe adrenal gland
• Extremely rare fusion anomaly
• Often associated with asplenia/polysplenia syndromes and other heterotaxy abnormalities

⸻

☢️ What is elastography?

🔻Elastography is an ultrasound-based (or MRI-based) imaging technique that measures tissue stiffness (elasticity).
It works on the principle that pathological tissues often have different stiffness than normal tissue—for example, many malignant tumors are stiffer than benign or normal tissue.

Think of it as a “virtual palpation” performed by imaging rather than by hand.

⸻

🔻Types of elastography (Ultrasound-based)

1. Strain elastography (SE)
• Measures tissue deformation after external compression (manual or physiological).
• Qualitative or semi-quantitative
• Results displayed as a color map (soft → hard).
• Operator dependent.

2. Shear Wave Elastography (SWE)
• Uses acoustic pulses to generate shear waves.
• Measures shear wave velocity, converted to stiffness:
• Expressed in kPa or m/s
• Quantitative, reproducible, less operator dependent.

⸻

☢️Role of elastography in thyroid gland pathologies

🔻1. Thyroid nodules (main clinical use)

Elastography helps differentiate benign from malignant nodules.

General principle:
• Malignant nodules → stiffer
• Benign nodules → softer

Typical findings:
• Benign nodules
• Low stiffness
• Elasticity similar to surrounding thyroid tissue
• Malignant nodules (e.g., papillary carcinoma)
• High stiffness
• Often appear predominantly “hard” on elastography

Diagnostic value:
• Improves specificity of conventional ultrasound
• Helps reduce unnecessary FNAC in low-risk nodules
• Adjunct tool, not a replacement for FNAC

Elastography is most useful in indeterminate nodules (TI-RADS 3–4)

⸻

🔻2. Integration with TI-RADS
• Elastography is not part of formal ACR TI-RADS, but:
• Acts as a supporting risk stratification tool
• High stiffness → increases suspicion
• Low stiffness → supports benign nature

⸻

🔻3. Diffuse thyroid diseases

Hashimoto thyroiditis
• Gland shows increased stiffness due to fibrosis and chronic inflammation
• Stiffness correlates with:
• Disease severity
• Degree of fibrosis

Graves’ disease
• May show moderately increased stiffness
• Usually less stiff than Hashimoto thyroiditis

Elastography can help differentiate diffuse thyroid disorders, but this is a secondary application.

⸻

🔻4. Post-treatment follow-up
• Monitoring stiffness changes after:
• Radiofrequency ablation
• Ethanol ablation
• Surgery or radioiodine therapy
• Decreasing stiffness → treatment response

⸻

⚠️Limitations of thyroid elastography
• Less reliable in:
• Cystic or heavily calcified nodules
• Very small nodules (

☢️MRI in pregnancy — when is it appropriate?☢️

⚠️Short answer: when it will change management and ultrasound isn’t enough. MRI is considered safe in pregnancy when used thoughtfully.

⚠️Safety basics
• No ionizing radiation → unlike CT or X-ray.
• Extensive data show no proven harm to the fetus at 1.5 T (and 3 T when clinically justified).
• Gadolinium contrast: avoid unless there’s a strong, life-saving indication (it crosses the placenta).

⸻

🔺When MRI is appropriate

Use MRI if ultrasound is inconclusive or limited and the result will affect care.

🧠 Fetal indications
• CNS anomalies: ventriculomegaly, agenesis of corpus callosum, posterior fossa abnormalities
• Spinal defects: myelomeningocele, tethered cord
• Thoracic lesions: congenital diaphragmatic hernia, lung masses (CPAM)
• Abdominal/pelvic anomalies: bowel obstruction, renal anomalies
• Suspected placental invasion (accreta spectrum) when US is equivocal

🤰 Maternal indications
• Acute abdomen:
• Suspected appendicitis
• Ovarian torsion
• Biliary or urinary obstruction when US is nondiagnostic
• Neurologic symptoms:
• Stroke, MS relapse, spinal cord compression
• Pelvic masses:
• Characterization of adnexal masses
• Placental disorders:
• Placenta accreta/increta/percreta

⸻

⚠️Timing considerations
• Any trimester: MRI can be done if clinically indicated
• First trimester: avoid unless essential (precautionary, not proven harm)
• Second & third trimesters: commonly used

⸻

🔺When MRI is not first choice
• Routine screening
• When ultrasound provides a clear answer
• If the result won’t change management

⸻

🔺Key take-home points
• ✔ MRI is safe and valuable in pregnancy
• ✔ Use it problem-solving, not routinely
• ❌ Avoid gadolinium unless absolutely necessary
• ✔ Always balance clinical benefit vs necessity

☢️Cone-Beam CT (CBCT) in Interventional Radiology — why it matters..?

CBCT gives you CT-like 3D imaging right in the angio suite, using the C-arm. Think of it as seeing the anatomy in depth without leaving the table. Here’s how it earns its place in daily IR work:

⸻

1) Pre-procedural planning (on the fly)
• Precise 3D vascular anatomy and organ relationships
• Identifies tumor feeders, variant arteries, and safe access paths
• Useful when prior CT/MRI is outdated or anatomy has shifted

Typical uses
• Liver tumors (TACE, TARE)
• AVMs/AVFs
• Complex pelvic or bronchial arteries

⸻

2) Guidance during the procedure
• Real-time 3D roadmap for catheter/wire navigation
• Needle guidance for percutaneous interventions
• Overlay of CBCT on live fluoroscopy (image fusion)

Examples
• Super-selective embolization
• Tumor ablation (liver, kidney, lung)
• Biopsies and drainages in difficult locations

⸻

3) Assessment of technical success
• Immediate confirmation of:
• Tumor coverage after embolization
• Ablation zone margins
• Stent position and expansion

This reduces the classic “wait for post-procedure CT” uncertainty.

⸻

4) Detection of complications (early)
• Active extravasation
• Non-target embolization
• Organ injury or malpositioned devices

Early detection = faster correction.

⸻

5) Dose and contrast optimization
• Fewer angiographic runs
• Reduced contrast volume (important in renal impairment)
• Often lower total radiation in complex cases (despite higher single-spin dose)

⸻

High-impact clinical applications
• Oncology IR: TACE, TARE, tumor ablation
• Neuro & peripheral AVMs
• EVAR adjunct imaging
• Spine procedures: vertebroplasty, biopsies
• Interventional oncology response assessment

⸻

Limitations to remember
• Lower soft-tissue contrast vs MDCT
• Motion artifacts (breathing, bowel)
• Limited field of view
• Requires operator experience for optimal use

⸻

🔻Bottom line

CBCT turns the angio suite into a hybrid CT lab, improving precision, safety, and confidence—especially in interventional oncology and complex embolization.