Q27: Other congenital malformations of peripheral vascular system

The ICD-10 grouping Q27, titled "Other congenital malformations of peripheral vascular system," encompasses a range of conditions that involve abnormalities in the vascular (blood vessel) system of the body, which are present from birth. These conditions result from defects in the formation and development of blood vessels during fetal development. They can significantly vary in their manifestation and severity, thereby causing a wide range of symptoms which typically depend on the site and extent of the vascular malformation. Common symptoms may include visible marks on the skin such as a birthmark or a lump, pain, and issues like swelling in the affected area. The progression of these conditions also varies - some may remain stable throughout life, while others may progress, causing complications like bleeding, infections, or ulcers. The peripheral vascular system, which includes all the blood vessels outside the heart, is the system primarily affected in these conditions. Importantly, it is not caused by anything the mother did or didn't do during pregnancy, but the exact causes are usually unknown.