RÉSUMÉ
Immunoglobulin deficiency with increased IgM, as defined by World Health Organization classification of primary immunodeficiency, is characterized by normal or increased concentrations of serum IgM and, in some cases, IgD, but decreased or absent IgG, IgA, and IgE. Patients with these disorders have a high incidence of recurrent pyogenic infections, including otitis media, pneumonia, and septisemia. We recently experienced a case of immunoglobulin deficiency with increased IgM in a 25-year old man. He had been suffered from recurrent pyogenic infections-pneumonia, otitis media-since about 6 months of his age. He was admitted due to pneumonia, and Haemophilus influenza was isolated from the sputum culture. Also chest X-ray showed bronchiectasis. His serum immunoglobulin levels revealed increased concentration of IgM and decreased IgG and IgA. He was successfully treated with antibiotics, and now he is being followed-up. So we present this case with the review of literature.