A system of surgery . scrotum. Whenmultiple they areoften symmetrical sofar as situation isconcerned. Rarelya lipoma becomespedunculated, andthere is a varietyknown as diffuselipoma, in which thesubcutaneous fat in the neck, the axillae, groins and pubic region,becomes excessive and forms unencapsuled masses, as in Fig. 98. 2. Subserous lipomata.— The peritoneum, like the skin,rests upon a bed of fat. In this subserous fatty deposit lipomataare prone to occur, and, like those of the subcutaneous species,they may be sessile, pedunculated, or diffuse. When arising inthe perirenal fat or in the m
A system of surgery . scrotum. Whenmultiple they areoften symmetrical sofar as situation isconcerned. Rarelya lipoma becomespedunculated, andthere is a varietyknown as diffuselipoma, in which thesubcutaneous fat in the neck, the axillae, groins and pubic region,becomes excessive and forms unencapsuled masses, as in Fig. 98. 2. Subserous lipomata.— The peritoneum, like the skin,rests upon a bed of fat. In this subserous fatty deposit lipomataare prone to occur, and, like those of the subcutaneous species,they may be sessile, pedunculated, or diffuse. When arising inthe perirenal fat or in the mesentery, lipomata may attain pro-digious proportions—fifty or sixty pounds. Exceptionally largefatty tumours have been encountered between the layers of thebroad ligament of the uterus, simulating ovarian cysts. Sub-peri-toneal fatty tumours sometimes drag upon the peritoneum in theneighbourhood of the inguinal and femoral rings, and produce finger-iike diverticula of this membrane, which, when surrounded by fat,. Fig. 98.—Diffuse Lipoma. (After Morrant Baker.) LIPOMATA. 461 are often mistaken for ruptures; they are known as fatty a fatty hernia forms a swelling as large as a bantamsegg in the scrotum or labium, and when exposed is not unlikeomentum. Subserous lipomata associated with small peritonealpouches are not uncommon in the linea alba in the vicinity of theumbilicus. (See Art. XLVIIL, on Hernia, Yol. II.) Pedunculated subserous lipomata are usually associated with thecolon; they are for the most part very large arborescent epiploicappendages. 3. Subsynovial lipomata.—Many synovial membranes havefat in the deeper layers. This fat may increase in quantity andcause the serous membrane to bulge into the joint until the massbecomes distinctly pedunculated—a subsynovial lipoma. This occursmost frequently in association with the alar ligaments of the knee-joint. The unusual variety to which J. Miiller gave the name lipoma arborescens consists of
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