Computed tomography with normal chest radiograph in tuberculous infection

Area of Science:

• Pediatrics
• Infectious Diseases
• Radiology

Background:

• Primary tuberculosis infection in children requires preventive treatment to reduce disease incidence.
• Diagnosing tuberculosis infection without active disease is challenging, as minimal active disease may be missed on chest X-rays.
• Mediastinal lymph node enlargement is a potential indicator of active tuberculosis in infected children.

Purpose of the Study:

• To evaluate the utility of computed tomography (CT) in detecting unrecognised active tuberculosis in children with primary infection and normal chest radiographs.
• To assess the size of mediastinal lymph nodes in infected children compared to controls.
• To inform treatment strategies for pediatric tuberculosis infection.

Main Methods:

• Computed tomography (CT) scans were performed on 15 children with confirmed tuberculous infection and normal chest radiographs.
• Mediastinal lymph node sizes were measured in infected children and compared to 10 tuberculosis-free control children.
• Age-related differences in lymphadenopathy were analyzed.

Main Results:

• Sixty percent (9 of 15) of infected children exhibited enlarged mediastinal lymph nodes on CT scans.
• Enlarged lymph nodes were more prevalent in infected children under 4 years old compared to those over 8 years old.
• The findings suggest a significant rate of unrecognised active disease in children with primary tuberculosis infection.

Conclusions:

• CT imaging can reveal unrecognised active tuberculosis in children with primary infection and normal chest X-rays.
• The presence of enlarged lymph nodes in infected children challenges the assumption of latent infection and suggests active disease.
• A two-drug regimen may be more effective than isoniazid monotherapy for treating these cases of unrecognised active tuberculosis.