. The diseases of children : medical and surgical. rm there is often somecavernous formation. After removal frorn the body andescape of its blood, a subcutaneous or mixed nsevus consists of a tough,spongy, or stringy mass, often somewhat lobulated, and always much smallerthan might be expected from its size before removal. If encapsuled, it willbe found that only a small number of vessels, and those of considerable size,feed the growth and enter it at various parts—a very important fact as regardsthe treatment of these cases. Simple xueevi consist of newly formed vessels having the structure o
. The diseases of children : medical and surgical. rm there is often somecavernous formation. After removal frorn the body andescape of its blood, a subcutaneous or mixed nsevus consists of a tough,spongy, or stringy mass, often somewhat lobulated, and always much smallerthan might be expected from its size before removal. If encapsuled, it willbe found that only a small number of vessels, and those of considerable size,feed the growth and enter it at various parts—a very important fact as regardsthe treatment of these cases. Simple xueevi consist of newly formed vessels having the structure ofcapillaries, and presenting ampullar or cirsoid dilatations ; the vessels aresupported by a framework of connective tissue, and often fat. Cavernous Waevi consist of an irregular network of fibrous tissue, in-closing freely intercommunicating spaces like the channels in a sponge ; there 1 Sir J. Paget. 2 A good account of the structure of nsevi will be found in Cornil and RanviersHistology, to which we are indebted for part of our Fig. 8i.—Extensive Mixed Naevus of the Face,involving the lower lip and both cheeks up tothe ears. N<2VUS 423 is occasionally unstriped muscular fibre developed in the septa, as well asvessels and nerves. The endothelium lining a n^rvoid lacuna is exactly likethat of a vein. These naevi are formed by dilatation of newly developedcapillaries and subsecjuent absorption of their barrier walls, so that freeopenings are made between adjacent vessels. hnportance of NcEvi.— Usually nasvi are simply disfigurements ; some-times, however, they may give rise to serious bleeding from rupture of vesselsby injury or ulceration, as in a case of our own where the soft palate anduvula were the seat of a large nevoid growth and frequent bleeding occurred ;similar trouble has been met with in the case of rectal nasvi. Internal naivimay possibly be dangerous from hcemorrhage, or from extravasation of bloodsetting up peritonitis, &c. ; butthis must
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