348 Tumors. 



of rupture of the pedicle such lipomata become loose in the 

 peritoneal cavity and may be found at autopsy as compressed 

 free bodies. These peritoneal lipomata present a smooth surface, 

 are semitransparent, yellowish or white. Lobulated lipomata are 

 found also in the cow and hog in the omentum, and in the intes- 

 tine and perirenal fat; in these animals the fat is firm and white. 

 The subcutaneous tissue is a frequent site in the horse, especially 

 in the neighborhood of the knees where tliey may attain very large 

 size (twenty-six and a half kilograms in a case reported by 

 Moller) ; and in the dog especially on the inner surface of the thigh, 

 in the fold of the knee (Frohner), and in the breast (Stockfleth). 

 As submucous growths they have been found in the uterus (a lipo- 

 ma of a cow recorded by Lund reaching a weight of seventy-five 

 kilograms), and in the membrana nictitans in the horse and dog 

 (Frohner). Here, too, their shape is nodular or lobular and the 

 growth is usually well circumscribed and therefore easily shelled 

 out. 



Sometimes lipomata appear in positions where adipose tissue 

 does not normally exist; thus two lipomata of the size of a 

 child's head have been found in a dog's liver by Trasbot, small 

 lipomata in the kidneys of the same animal (Bruckmiiller), and 

 Kuhnau encountered a rare instance of a lipoma of the brain in a 

 three-year-old beef (four centimeters in diameter, rounded and 

 arising from one of the bloodvessels of the pia mater). This 

 last instance was congenital. According to Bostrom it is pos- 

 sible that a bit of germinal fat tissue of the skin of the embryo 

 might have been separated and been misplaced in the cranial 

 area. Lubarsch suggests that intraparenchymatous renal lipo- 

 mata take their origin from portions of the renal capsule. 



Lipomata occur as either single or multiple primary growths. 

 They may occasionally undergo mucoid degeneration (lipoma 

 myxomatodes), calcification {lipoma pctrificans) or dry anaemic 

 necrosis. When the combined fibrous connective tissue is espe- 

 cially abundant they may be very firm (lipofibroma). They 

 are slow in growth, but as above stated may attain considerable 

 size. Those which are situated subcutaneously may be easily 

 extirpated ; they are not recurrent and do not give rise to 

 metastases. 



