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Right middle lobe syndrome in children
Insights
Right middle lobe syndrome (RMLS) in children often presents with vague symptoms, delaying diagnosis. Impaired collateral ventilation, rather than obstruction, is the likely cause, with bronchoscopy aiding treatment and diagnosis.
Area of Science:
- Pediatric Pulmonology
- Thoracic Medicine
Background:
- Right middle lobe syndrome (RMLS) encompasses various conditions affecting the middle lobe of the lung.
- Pediatric RMLS diagnosis can be challenging due to non-specific symptoms and findings.
Purpose of the Study:
- To evaluate the clinical characteristics, diagnostic findings, and treatment outcomes of RMLS in children.
- To explore the underlying pathogenesis of RMLS in the pediatric population.
Main Methods:
- Retrospective review of 21 pediatric patients diagnosed with RMLS over 10 years.
- Detailed analysis of patient history, bronchoscopic findings, and pathological data.
- Assessment of treatment strategies including medical management and surgical intervention.
Main Results:
- Most pediatric RMLS patients had asthma or a family history of atopic disorders.
- Bronchoscopic obstruction was minimal in most cases; impaired collateral ventilation was the most plausible theory.
- Bronchoscopy was therapeutic in two-thirds of cases, with resolution in one-third and eventual resolution in another third.
- Four patients required lobectomy for cure; two had persistent symptoms.
Conclusions:
- Pediatric RMLS is often linked to asthma and atopy, with impaired collateral ventilation as a key pathogenic factor.
- Bronchoscopy is crucial for diagnosis and therapy, and aggressive medical management post-procedure is recommended.
- While many cases resolve with conservative measures, some may require surgical intervention.
Abstract:
Right middle lobe syndrome (RMLS) is characterized by a spectrum of diseases from recurrent atelectasis and pneumonitis to bronchiectasis of the middle lobe. It has been described among all age groups, although the diagnosis in pediatrics may be delayed or missed because of non-specific symptoms or findings. Twenty-one children with RMLS were evaluated during the past 10 years with particular attention to the history, bronchoscopic and pathologic findings. Most of these patients had asthma or a family history of atopic disorders; 3 patients had a family history of RMLS. Only two of the 21 patients had sufficient obstruction on bronchoscopy to account for their disease. Four had evidence of concomitant laryngeal pathology. The various theories of pathogenesis are discussed. In this series, the non-obstructive (impaired collateral ventilation) theory appeared to be most plausible. Bronchoscopy was performed in all instances to rule out obstruction due to foreign body or tumor. It was therapeutic in two-thirds of the cases. Resolution occurred promptly in one-third, and eventually in another third. Of the remaining patients, 4 required lobectomy and were cured; two have decreased but persistent symptoms. An aggressive medical management following bronchoscopy is warranted in all cases, especially when there is a possibility of asthma.