Cases of<unk>  are diagnosed by histopathologic inspection. In prenatal cases,<unk>  is diagnosed during the late first trimester or early second trimester using an ultrasound. Other imaging methods such as CT and MRI scans are useful in treatment planning, delineate the size of the lesion, and determine its surrounding vital structures. T2-weight MRI is useful to differentiate<unk>  from surrounding structures due to its high T2 signal. Classification Cavernous<unk> , H&E stain. Irregular, dilated spaces are visible in dermis.<unk> s have traditionally been classified into three subtypes: capillary and cavernous<unk> s and cystic hygroma. This classification is based on their microscopic characteristics. A fourth subtype, the hemangiolymphangioma is also recognized. ;Capillary<unk> s :Capillary<unk> s are composed of small, capillary-sized lymphatic vessels and are characteristically located in the epidermis. ;Cavernous<unk> s :Composed of dilated lymphatic channels, cavernous<unk> s characteristically invade surrounding tissues. ;Cystic hygromas :Cystic hygromas are large, macrocystic<unk> s filled with straw-colored, protein-rich fluid. ;Hemangiolymphangioma :As suggested by their name, hemangiolymphangiomas are<unk> s with a vascular component.<unk> s may also be classified into microcystic, macrocystic, and mixed subtypes, according to the size of their cysts. ;Microcystic<unk> s :Microcystic<unk> s are composed of cysts, each of which measures less than 2 cm3 in volume. ;Macrocystic<unk> s :Macrocystic<unk> s contain cysts measuring more than 2 cm3 in volume. ;Mixed<unk> s<unk> s of the mixed type contain both microcystic and macrocystic components. Finally,<unk> s may be described in stages, which vary by location and extent of disease. In particular, stage depends on whether<unk> s are present above or superior to the hyoid bone (suprahyoid), below or inferior to the hyoid bone (infrahyoid), and whether the<unk> s are on one side of the body (unilateral) or both (bilateral). ;Stage I: Unilateral infrahyoid. ;Stage II: Unilateral suprahyoid. ;Stage III: Unilateral suprahyoid and infrahyoid. ;Stage IV: Bilateral suprahyoid. ;Stage V: Bilateral suprahyoid and infrahyoid.
Lymphangioma
Hemangioma
Angioma
Lymphohemangioma
Chorangioma
Chorioangioma
Tufted angioma
Cavernous hemangioma