[Case report of hereditary hemorrhagic telangiectasia in children and literature review].

To analyze the clinical features of 2 children with hereditary hemorrhagic telangiectasia (HHT) and review relevant literature. The clinical data of 2 children with HHT who were admitted to Beijing Children's Hospital, Capital Medical University from February 2017 to June 2018 were retrospectively analyzed. Meanwhile, the relevant papers published before December 2019 in Wanfang and Pubmed database were searched with the key words of "hereditary hemorrhagic telangiectasia" in Chinese and English, and reviewed. The first case was an 11-year-old boy, presented with fever and cough for 6 days. His past history revealed 3 times of left pneumonia and mild epistaxis. Ultrasound of the chest soft tissue found hemangioma and vascular malformation. Enhanced CT with vascular reconstruction suggested pulmonary arteriovenous malformation and multiple arteriovenous fistulas in the liver. After being treated with interventional pulmonary arteriovenous fistula embolization, his condition improved. The second case was a 12-year-old girl, presented with iron deficiency anemia during the past 3 years. Endoscopic resection of polyps had been performed before due to multiple polyps in the colon. High-resolution lung CT revealed multiple ground-glass nodules in bilateral lungs. Ultrasound of the digestive tract suggested small intestine polyps and secondary chronic loose intussusception. After admission, small bowel intussusception reduction was performed, and the polyps were ligated. Her whole exon gene testing suggested SMAD4 heterozygous variation. In the large number of reported cases, HHT1 and HHT2 are the main type. Children with HHT may present with anemia and repeated intestinal polyps. It is worth noting that visceral arteriovenous malformations, such as pulmonary arteriovenous malformations, which is easily misdiagnosed as recurrent pneumonia, can also occur in children with HHT. Enhanced CT with vascular reconstruction can help find pulmonary arteriovenous malformation, and timely genetic test can confirm the diagnosis.