TeleFast Rad

☢️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.
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☢️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.
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🔻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.

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🔻3. Presence of A-Lines

A-lines are horizontal reverberation artifacts.

👁️‍🗨️In pneumothorax:

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

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🔻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

☢️Placenta Previa ..! – Radiological Diagnosis ☢️

❇️ Placenta previa = implantation of the placenta in the lower uterine segment, partially or completely covering the internal cervical os.

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✅1. Imaging Modalities

🔸A. Ultrasound (Modality of choice)
• Transabdominal (TAS):
Initial screening method.
May be limited by bladder filling, fetal head, or maternal habitus.
🔸B. Transvaginal (TVS):
• Gold standard for diagnosis.
• Safe and gives precise localization of the placental edge relative to the internal os.

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👁️‍🗨️ Sonographic Features

🟰 A. Placental location
• Placenta seen in lower uterine segment, extending toward or covering the internal cervical os.

*️⃣ B. Classification (based on relationship to internal os):
1. Low-lying placenta: edge within 2 cm away → normal.

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4. Doppler Findings (if used)
• Normal vascular pattern.
• Used mainly to rule out placenta accreta spectrum if placenta previa is present (look for loss of clear zone, bridging vessels, lacunae, etc.).

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5. Pitfalls & Precautions
• Overdistended bladder may falsely elongate cervix and give false-positive diagnosis.
• Underfilled bladder may obscure the lower segment.
• Placental location should be re-evaluated after 28–32 weeks since it may “migrate” upwards as uterus grows.

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6. MRI Role
• Not routinely needed.
• Used if placenta accreta spectrum is suspected (to assess depth of invasion).

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7. Key Points
• TVS is safe even with bleeding.
• Always report:
• Placental location (anterior/posterior/fundal/low-lying)
• Distance from internal os
• Any evidence of accreta spectrum
• Placental thickness and morphology