Purpose. The purpose of the study is to show the importance of a multidisciplinary approach in the early verification of the primary immunodeficiency — Nijmegen breakage syndrome. A girl was admitted with complaints of daily productive cough, persistent obstruction of nasal breathing, mucopurulent discharge, recurrent respiratory tract infections for three years. From the age of 2, she suffered from protracted recurrent respiratory infections, repeatedly received inpatient treatment with systemic antibiotic therapy with insufficient effect in the form of maintaining complaints. When examining according to CT scan of the chest — single atelectasis, ground glass areas. Immunodeficiency states were excluded at the place of residence. On examination: phenotypic features of the type of «bird-like» face — sloping forehead, middle part of the face protruding forward, beak-shaped nose, large ears. Physical development is low: weight and height indicators are less than the 3rd percentile. From the nasal passages mucopurulent discharge, productive cough. Auscultatory — moist rales in all lung fields. For other organs and systems — without features. On examination: deep T-cell lymphopenia, according to CT scan signs of pansinusitis, bilateral otitis media; post-inflammatory pneumofibrotic changes. According to the results ofspirometry — mixed lesions. According to the results of immunological and genetic additional examination, the immunodeficiency state — Nijmegen breakage syndrome was verified, constant anti-inflammatory, antibacterial and antifungal, immunoglobulin replacement therapy was initiated.Conclusion. The presented clinical observation reflects the features of the course of the Nijmegen breakage syndrome. This example demonstrates the diagnostic complexity in verifying the diagnosis and shows the great importance of a multidisciplinary approach for the timely initiation of appropriate therapy, which, in turn, affects the severity of the disease and quality of life.
