| Summary: | Pneumatosis cystoides intestinalis (PCI) is a rare condition characterized by the presence of gas-filled cysts in the subserosa or submucosa of the bowel wall. It is associated with various disorders including chronic obstructive pulmonary diseases, autoimmune disorders, and organ transplantation. PCI has also been observed following Hematopoietic Stem Cell Transplantation (HSCT), associated with chemotherapy, acute Graft versus Host Disease (GvHD), immunosuppression, and infections. Computed tomography (CT) provides an easy diagnosis because it highlights the presence of air bubbles in the intestinal wall and possible pneumoperitoneum. We report the case of a patient with severe acquired medullary aplasia undergoing allogeneic HSCT with subsequent development of cutaneous GvHD and an incidental finding of PCI during a CT scan of the chest in absence of gastrointestinal symptoms. Our work aims at clarifying a possible complication in pediatric patients undergoing HSCT to guide young or non-pediatric radiologists in the identification of this rare condition, helping the clinician in the correct conservative management of these patients and reserving the surgical treatment only to specific complications.
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