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The Daily Insight

What are septal lines

Author

Rachel Hunter

Published May 26, 2026

Septal lines represent thickening of the interlobular septa – interstitial tissue which separates the secondary lobules at the peripheries of the lungs. Septal lines are a specific sign of interstitial oedema in the context of suspected left ventricular failure.

What are septal lines in the lungs?

Septal lines, also known as Kerley lines, are seen when the interlobular septa in the pulmonary interstitium become prominent. This may be because of lymphatic engorgement or edema of the connective tissues of the interlobular septa. They usually occur when pulmonary capillary wedge pressure reaches 20-25 mmHg.

What are B lines on ultrasound?

B lines, previously termed ”comet tails,” are vertical hyperechoic reverberations moving synchronously with the lung and represent key artifacts in interpreting pulmonary ultrasound findings [3,4]. The physiologic basis of B lines relates to decreased lung aeration [5], a finding that is nonspecific.

What are Kerley B and A lines?

Kerley B lines are small, horizontal, peripheral straight lines demonstrated at the lung bases that represent thickened interlobular septa on CXR. They represent edema of the interlobular septa and though not specific, they frequently imply left ventricular failure.

Are B lines normal?

Presence of multiple, diffuse, bilateral B-lines, associated to a normal heart, indicates a non-cardiac cause of pulmonary edema, as acute lung injury (ALI)/ARDS, interstitial pneumonia; alternatively, especially in a chronic setting, it should pose the suspicion of pulmonary fibrosis (Figure 5).

Is sarcoidosis a lung disease?

Sarcoidosis is a rare disease caused by inflammation. It usually occurs in the lungs and lymph nodes, but it can occur in almost any organ. Sarcoidosis in the lungs is called pulmonary sarcoidosis.

What is Hampton hump?

Hampton’s hump is a radiological sign consisting of a peripheral, wedge-shaped opacification adjacent to the pleural surface, which represents pulmonary infarction distal to a pulmonary embolus. 1. Owing to good pulmonary perfusion from collateral blood vessels, this sign is rarely seen in clinical practice.

What is Kerley C lines?

Kerley C lines. These are the least commonly seen of the Kerley lines. They are short, fine lines throughout the lungs, with a reticular appearance. They may represent thickening of anastomotic lymphatics or superimposition of many Kerley B lines.

What is septal line thickening?

Diffuse interlobular septal thickening (DIST) is a pattern of lung disease found on high-resolution thoracic CT scanning (HRCT or CTPA). It represents pathology in the periphery of the pulmonary lobules (ie, the interlobular septa).

What swollen lungs?

Pulmonary edema is a condition caused by excess fluid in the lungs. This fluid collects in the numerous air sacs in the lungs, making it difficult to breathe. In most cases, heart problems cause pulmonary edema.

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Can ultrasound see lungs?

It uses sound waves to look at the structures and organs in your chest. It can help your healthcare provider see how well your lungs and heart are working. A chest ultrasound can look at these areas: Lungs.

What do a lines mean ultrasound?

The A-line is a horizontal artifact indicating a normal lung surface. The B-line is a kind of comet-tail artifact indicating subpleural interstitial edema. The relationship between anterior interstitial edema detected by lung ultrasound and the pulmonary artery occlusion pressure (PAOP) value was investigated.

What is lung sliding?

Lung sliding is the respirophasic shimmering to and fro movement of the visceral and parietal pleural surface. The presence of lung sliding indicates that the lung is fully inflated at the site of probe placement on the chest wall, so there is no pneumothorax at that examination site.

What are Z lines on lung ultrasound?

Z lines are vertical, bundle-like shaped lines arising from the pleural line; however, they are ill-defined, do not erase A lines and are not perfectly synchronous with respiratory movements.

What is lung pulse?

Lung pulse is the cardiophasic movement of the visceral parietal pleural surface (arrow). The presence of lung pulse indicates that the lung is fully inflated at the site of probe placement on the chest wall, so there is no pneumothorax at that examination site.

How many lines does the lungs have?

LungsThe human lungs flank the heart and great vessels in the chest cavityDetailsSystemRespiratory systemIdentifiers

What is S1Q3T3?

However, the “S1Q3T3” pattern of acute cor pulmonale is classic; this is termed the McGinn-White Sign. Enlarge. A large S wave in lead I, a Q wave in lead III and an inverted T wave in lead III together indicate acute right heart strain.

Does pulmonary embolism show up on ECG?

ECG can be normal in pulmonary embolism, and other recognised features of include sinus tachycardia (heart rate >100 beats/min), negative T waves in precordial leads, S1 Q3 T3, complete/incomplete right bundle branch block, right axis deviation, inferior S wave notch in lead V1, and subepicardial ischaemic patterns.

What is pulmonary plethora?

Plethoric lung fields are seen in conditions which increase pulmonary blood flow.

What triggers sarcoidosis?

Sarcoidosis is an inflammatory disease in which granulomas, or clumps of inflammatory cells, form in various organs. This causes organ inflammation. Sarcoidosis may be triggered by your body’s immune system responding to foreign substances, such as viruses, bacteria, or chemicals.

What foods should be avoided with sarcoidosis?

  • Refrain from eating foods with refined grains, such as white bread and pasta.
  • Cut back on red meat.
  • Avoid foods with trans-fatty acids, such as commercially processed baked goods, french fries, and margarine.
  • Stay away from caffeine, tobacco, and alcohol.

What is the best treatment for sarcoidosis?

Corticosteroids are the primary treatment for sarcoidosis. Treatment with corticosteroids relieves symptoms in most people within a few months. The most commonly used corticosteroids are prednisone and prednisolone. People with sarcoidosis may need to take corticosteroids for many months.

What is the most common cause of interstitial lung disease?

A bacteria called Mycoplasma pneumoniae is the most common cause. Idiopathic pulmonary fibrosis. This makes scar tissue grow in the interstitium.

What is Cephalization on chest xray?

Cephalization refers to the redistribution of blood into the upper lobe vessels. It has been hypothesized that once the hydrostatic pressure exceeds 10 mm Hg, then fluid begins to leak into the interstitium of the lung.

What are Kerley B signs?

Kerley B lines (arrows) are horizontal lines in the lung periphery that extend to the pleural surface. They denote thickened, edematous interlobular septa often due to pulmonary edema.

What is a phantom tumor?

— The “phantom tumor” is a roentgenographic finding caused by fluid localizing in an interlobar fissure of the lung secondary to congestive heart failure. These fluid accumulations have also been called “vanishing tumor” and “pseudo tumor” of the lung because they tend to disappear when the heart failure is treated.

What Orthopnea means?

Orthopnea is the sensation of breathlessness in the recumbent position, relieved by sitting or standing. Paroxysmal nocturnal dyspnea (PND) is a sensation of shortness of breath that awakens the patient, often after 1 or 2 hours of sleep, and is usually relieved in the upright position.

What do damaged lungs feel like?

Coughing up blood: If you are coughing up blood, it may be coming from your lungs or upper respiratory tract. Wherever it’s coming from, it signals a health problem. Chronic chest pain: Unexplained chest pain that lasts for a month or more—especially if it gets worse when you breathe in or cough—also is a warning sign.

What foods irritate the lungs?

  • White Bread. Simple carbohydrates such as white bread should be avoided, as it takes more work for the lungs to metabolize them. …
  • Potato Chips. Potato chips are filled with salt and saturated fat, two things that are detrimental to lung health. …
  • Chocolate. …
  • Beer. …
  • Cold Cuts.

Can lungs hurt in your back?

Pleurisy, which is inflammation in the lining of the lungs, can cause sharp pains in the back and chest. This can often be the result of a viral or bacterial infection. Asthma, a chronic, long-term infection of the lung, may also cause pain in your back. Costochondritis is inflammation of rib cage cartilage.

How do you know if there's something wrong with your lungs?

  • Trouble breathing.
  • Shortness of breath.
  • Feeling like you’re not getting enough air.
  • Decreased ability to exercise.
  • A cough that won’t go away.
  • Coughing up blood or mucus.
  • Pain or discomfort when breathing in or out.