[An unusual association: tracheobronchomegaly with a normal pulmonary function test].

Area of Science:

• Pulmonology
• Radiology
• Rare Diseases

Background:

• Tracheobronchomegaly is a rare congenital or acquired condition characterized by significant dilation of the trachea and main bronchi.
• Diagnosis relies on characteristic radiological findings, particularly computed tomography (CT) of the chest.
• Clinical presentation is often nonspecific, making early diagnosis challenging.

Observation:

• A case report of a 31-year-old male patient presenting with tracheobronchomegaly.
• The patient exhibited the characteristic radiological features of the condition on chest CT.
• Notably, the patient's pulmonary function tests (PFTs) were within normal limits.

Findings:

• This case presents an unusual manifestation of tracheobronchomegaly where pulmonary function tests (PFTs) are normal.
• This finding contrasts with the typical PFT abnormalities, such as airflow limitation and increased residual volume, often seen in patients with this condition.
• The absence of airflow limitation in this patient suggests potential variations in disease pathophysiology or compensatory mechanisms.

Implications:

• This case underscores the importance of considering tracheobronchomegaly even in the presence of normal PFTs.
• It suggests that PFTs alone may not always reflect the severity or impact of tracheobronchomegaly.
• Further research may be needed to understand the factors contributing to normal lung function in some individuals with tracheobronchomegaly.