[Clinical aspects of capillary malformations]

Capillary malformations (CM) are defects of the dermal capillary bed. These slow-flow malformations can affect any part of the body and are always lateralized, despite Unna's naevus. Present at birth, they grow proportionally with the child. In rare instance, they can be part of a more complex syndrome such as Sturge-Weber syndrome. Ectatic CMs of telangiectatic types can be cutaneous, isolated, multiples, diffuse or generalized. In rare instance, they can be associated with epidermal modifications. They can also be part of a syndrome such as Fabry disease, Osler-Weber-Rendu disorder or Cutis marmorata telangiectatica congenita (CMTC). This chapter details the various clinical aspects of CMs.