We describe a boy presenting with macrosomy, body asymmetry, cutis marmorata and tall stature who developed a retinoblastoma. Although he does not have macrocephaly, his clinical picture is compatible with the diagnosis of Macrocephaly-cutis marmorata telangiectatica congenita syndrome (M-CMTC). Interestingly, retinoblastoma is not generally associated with overgrowth syndromes, and its occurrence in this patient suggests that M-CMTC is also a tumour-prone syndrome.