70 CLINICAL APPLIED ANATOMY. 



Angiomata, or blood tumours. 



Angiomata are tumours composed of an abnormal formation 

 of blood vessels. As a rule they are spoken of as nasvi. 



One form of the subcutaneous capillary naevus the "port- 

 wine stain " is most often found upon the face, but it may be 

 seen upon the trunk or even a limb. Its frequency upon the 

 face and its actual distribution in particular regions of the 

 cheek may be dependent upon nerve distribution, the influence 

 of the nerve during development possibly having some obscure 

 bearing upon the excessive formation of capillaries. 



The other, circumscribed, form is very common, and may be 

 found in almost any part of the skin, but it is peculiarly 

 liable to be seen on the face or head, on the trunk, and on the 

 external genital organs. 



The more deeply placed naevi the cavernous angiomata 

 which are often in structure extremely like the vascular portions 

 of the corpus spongiosum, may be found in the same regions as 

 the capillary form, or beneath the deep fascia, in muscles, or 

 even in the viscera, as for instance in the liver. 



The last form of angioma, frequently termed plexiform, is 

 rare, and almost entirely confined to the scalp and upper limb, 

 and consists for the most part of vessels which should rank as 

 arteries. 



Lymphangiomata, or lymphatic tumours. 



A lymphangioma bears the same relation to lymphatic vessels 

 as an angioma bears to blood vessels. 



A lymphatic naevus is generally seen in the condition known as 

 macroglossia, in which there is congenital enlargement of the 

 tongue. Occasionally it may occur in the skin, and particularly 

 in regions where lymphatic glands are collected. 



Another form of lymphangioma occurs as the so - called 

 " hydrocele of the neck," which is in reality a lymphatic cyst. 

 Cysts may also arise in the axillae and the adjacent part of the 

 thoracic walls. They are usually present at birth, and bear some 

 resemblance to the large subcutaneous lymph spaces of frogs. 



Myomata, or muscle tumours. 



