Overview

Macrocephaly-capillary malformation (M-CM) is a multiple malformation syndrome causing abnormal body and head overgrowth and abnormalities of the skin, vascular system, brain and limbs.  The disorder is assumed to have a genetic basis, but the exact cause is unknown.  A diagnosis of M-CM is currently made based solely on clinical observations.  Though not every affected individual has all features, commonly found signs include macrocephaly, congenital macrosomia, extensive cutaneous capillary malformations, body asymmetry, extra or fused fingers or toes, lax joints, doughy skin, variable developmental delays and other neurologic problems such as seizures and low muscle tone. 

M-CM was first described in the medical literature in 1997.  At that time it was named macrocephaly-cutis marmorata telangiectatica congenita syndrome (M-CMTC) and this term is occasionally still used.  

M-CM appears to affect boys and girls equally and it is seen among all ethnicities.  It occurs sporadically in families who have no other affected family members.  While there have been only just over 130 reported cases of M-CM, there are likely many more affected individuals who have been misdiagnosed, are unrecognized or have not been published in the medical literature.

The M-CM Network was founded in 2010 through a team effort between families and the medical genetics community.  Our goal is to increase awareness of this condition and bring families and clinicians together to advance knowledge and encourage research. 

The following is a detailed summary of M-CM including an explanation of this condition, physical findings, medical issues and treatment options.  Please keep in mind that not all children with M-CM will have every one of the described problems.  Just like anyone with or without an underlying condition, every child is different. No two children with M-CM are exactly alike.