Cutis marmorata telangiectatica congenita (CMTC) is a congenital localized or generalized vascular anomaly characterized by a persistent cutis marmorata pattern with a marbled bluish to deep purple appearance, spider nevus-like telangiectasia, phlebectasia and, occasionally, ulceration and atrophy of the affected skin.

Abnormal dilatation of the pulmonary lymphatic vessels. Lymphatic fluid in the lung is derived from normal leakage of fluid out of the blood capillaries in the lung. In pulmonary lymphangiectasia, the pulmonary lymphatics are not properly connected and become dilated with fluid.