Fine-needle aspiration biopsy (FNAB) is a simple, safe and effective method for investigating suspected mycobacterial lymphadenitis in children. Fluorescence microscopy can provide rapid mycobacterial confirmation. Light-emitting diodes (LEDs) provide a cheap and robust excitation light source, making fluorescence microscopy feasible in resource-limited settings.
Division of Anatomical Pathology, Department of Pathology, National Health Laboratory Service, Stellenbosch University, Cape Town, South Africa. avw@sun.ac.za