Total proctocolectomy with enteral reservoir is, at present, the best technique used for the surgical treatment of some large intestine diseases involving the whole colon. In order to study the characteristics of the "J" reservoir enteral mucosa, thirty-six dogs underwent surgery. After resection of 5cm of the jejunum caudalis the animals were divided into two equal groups (GI and GII) for study-control. In GI, an entero-enteral end-to-end anastomosis was performed; in GII, a "J" reservoir was performed in the cranialis segment of the jejunum and this pouch was anastomosed end-to-end to the jejunun caudalis (similar to GI). On the 21st, 42nd and 63rd postoperative days, six animals of each group were sacrificed for macro and microscopic studies, including cellular counting and the measuring of the enteral mucosa lamina propria. On the 21st day, both groups showed oedema and erythema on macroscopic examination, and necrosis under microscopy in similar numbers. On the 42nd and 63rd days, these alterations decreased or disappeared in GI and persisted in GII. Only in the latter group, on macroscopy, ulcers were observed on the 21st day (2 dogs) and on the 42nd day (1 dog). In both groups there was no significant difference as to the incidence of abscess under microscopy. On the 21st day there was an increase of the volumetric density of neutrophils polymorph, macrophages, eosinophils, plasma cells and lymphocites in both groups. All the cells, except the eosinophils, showed a significant enlargement of the volumetric density in GII on the 63rd day. The transversal diameter of lamina propria, except for the villi height, was significantly larger in GII on the 63rd postoperative day. It was concluded that the enteral mucosa of the "J" reservoir in dogs shows alterations of the normal pattern of macroscopy and microscopy, including the volumetric density enlargement of the inflammatory cells.
Intestinal Mucosa; Small Bowel; Ulcerative Colitis; Familial Polyposis
