Serial computed tomography and lung function testing in pulmonary Langerhans' cell histiocytosis

Area of Science:

• Pulmonary Medicine
• Radiology
• Histiocytosis Research

Background:

• Longitudinal lung function changes in pulmonary Langerhans' cell histiocytosis (LCH) are poorly understood.
• The utility of serial computed tomography (CT) in managing pulmonary LCH requires evaluation.

Purpose of the Study:

• To investigate longitudinal lung function variation in pulmonary LCH patients.
• To assess the role of serial lung CT in managing these patients.

Main Methods:

• Retrospective study of 49 pulmonary LCH patients.
• Serial evaluation using lung CT and pulmonary function tests (PFTs).
• Correlation analysis between CT lesion extent and lung function parameters.

Main Results:

• Lung function deteriorated in approximately 60% of patients.
• Forced expiratory volume in 1 second (FEV(1)) and diffusing capacity for carbon monoxide (D(L,CO)) showed frequent deterioration.
• Airway obstruction was the predominant functional pattern, associated with FEV(1) at diagnosis.
• Increased cystic lesions on CT correlated with impaired lung function but did not predict decline in FEV(1) or D(L,CO).

Conclusions:

• Serial PFTs are crucial for monitoring pulmonary LCH patients, who often develop airway obstruction.
• Initial lung CT is informative, but routine sequential CTs offer limited value.
• Further prospective studies are needed to identify patients with early progressive disease.