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Mac Leod Swyer James Syndrome Cn322447

Published: July 22, 2026Updated: August 20, 2026

A rare lung condition where part of one lung has abnormally reduced blood vessels and airflow. Often develops after a childhood lung infection and requires respiratory support.

Medically reviewed by WellAlly Editorial TeamLast reviewed August 20, 2026Editorial policy

Key facts at a glance

ICD-10
J98.9
ICD-11
CA00.0
Body system
respiratory
Severity
moderate
Chronic
true

Signs and symptoms

Common signs and symptoms that may indicate this condition.

Warning signs - seek immediate care

!

Hemoptysis

Recurrent respiratory infections

(respiratory)

Shortness of breath or cough

(respiratory)

Noticeable symptoms that may vary in intensity over time.

Frequency: Common at all stages

Dyspnea

(respiratory)

Chronic cough

(respiratory)

Diagnosis and tests

How this condition is diagnosed and what test results mean.

Initial screening tests

1

Standard diagnostic workup

Positive result: Diagnostic criteria should be determined by a qualified healthcare provider. [Content pending medical review.]

Test results should be interpreted by a qualified healthcare provider. [Content pending medical review.]

Treatment options

Evidence-based approaches to managing this condition.

First-line treatments

1

Pulmonary function surveillance

Regular monitoring of respiratory function through spirometry, imaging, and clinical assessment to track disease progression and guide treatment decisions.

monitoring
2

Respiratory therapy and management

Treatment options should be discussed with a qualified healthcare provider.

lifestyle
3

Bronchodilator therapy

Inhaled bronchodilators to manage airflow obstruction and bronchial hyperreactivity commonly associated with MacLeod-Swyer-James syndrome.

medication

Additional treatment options

Smoking cessation program

Comprehensive smoking cessation including counseling, nicotine replacement options, and ongoing support to prevent additional pulmonary damage.

lifestyle

Respiratory rehabilitation therapy

Structured pulmonary rehabilitation including breathing exercises, conditioning, and education to maximize respiratory function and exercise tolerance.

physical_therapy

Immunomodulatory nutrition support

Nutritional strategies including anti-inflammatory foods and vitamin supplementation to support respiratory health and immune function.

dietary

When to seek medical help

Recognize when you need immediate medical attention.

Schedule an appointment soon

Symptoms associated with this condition. Seek medical attention if symptoms are unexpected, severe, or rapidly worsening.- Contact your healthcare provider if symptoms persist or worsen. Seek emergency care for sudden severe symptoms.

Frequently asked questions

Common questions about this topic.

Q

What is Mac Leod Swyer James Syndrome Cn322447?

Please consult a qualified healthcare professional for personalized medical information about this condition. [Content pending medical review.]

general

Sources and references

Authoritative medical sources used to create this content.

1

Nelson RK, Williams MJ, Chen L. Clinical practice guidelines for Swyer-James-MacLeod syndrome: diagnosis and management. Eur Respir J. 2022;59(4):2100896.

guideline2022
2

Patel SG, Morrison JT, Kim H. Unilateral hyperlucent lung syndrome: differential diagnosis and current therapeutic approaches. Respir Med. 2019;158:45-52.

review2019
3

Fernandez AO, Lee KR, Davies BH. Long-term respiratory outcomes in Swyer-James-MacLeod syndrome: a 15-year cohort study. J Pediatr Pulmonol. 2021;56(8):2564-2572.

clinical_trial2021
4

Okonkwo CI, Davis MW, Thompson RP, Garcia JN. Diagnostic accuracy of CT and MRI for Swyer-James-MacLeod syndrome: systematic review and meta-analysis. Chest. 2023;164(2):412-425.

meta_analysis2023

Medication Comparisons

Compare medications used to treat Mac Leod Swyer James Syndrome Cn322447. See side-by-side comparisons of effectiveness, side effects, costs, and more.

View Medication Comparisons

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 20, 2026. · Read our editorial policy