Abstract
From the beginning of 2000s, there has been a significant increase in the incidence of inflammatory bowel diseases (IBD) and primary immunodeficiency disorders (PIDs) in adults and children in many countries around the world. The aim of the review is to summarize the state-of-the-art on diverse clinical types of PIDs with gastrointestinal manifestations and their differential diagnostic algorithms.
 Atypical PIDs with “blunted” clinical manifestations are challenging for the timely diagnosis. Some types of PIDs with gastrointestinal involvement are also difficult to differentiate with classical IBDs. Molecular genetic studies have allowed for selection of a specific group of monogenic IBD-like diseases, represented mainly by PIDs. The authors discuss current classification of PIDs and their main clinical types imitating IBD, with important clinical and laboratory aspects. High level of information and awareness of practicing specialists working with IBD patients would be helpful in the selection of a patient cohort with possible PIDs and in the performance of extended laboratory assessment or referring for genetic tests. Timely diagnosis of PIDs would ensure quick administration of target therapy or hematopoietic stem cell transplantation, which in most cases would allow for the achievement of the disease remission, improvement of quality and duration of life.
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