Small Animal Radiology and Ultrasound: A Diagnostic Atlas and Text

348 Small Animal Radiolo g y and Ultrasono graphy
Fig. 3-120 Transverse (A to C) and
longitudinal (D) sonograms of the
abdomen of a 14-month-old castrated
male Siamese cat with a history
of anorexia and lethargy of 2
months duration. A mass was palpable
in the midabdomen. There is a
heteroechoic abdominal mass with
an eccentrically located hyperechoic
region (arrows), which represents
the intestinal lumen. This is indicative
of a bowel-associated mass.
Diagnosis: Feline infectious peritonitis.
A
B
C
D
Fig. 3-121 An 8-year-old neutered male
domestic short-haired cat had abdominal distention.
A longitudinal sonogram reveals a large
volume of fluid in the peritoneal cavity. It contains
numerous echogenic foci (short arrows).
The intestines have gathered into a tight ball
(long arrows). Diagnosis: Echogenic ascites and
bunched intestines due to carcinomatosis from
a small intestinal adenocarcinoma.
the patient’s history or physical examination. If a colonic obstruction is present, the
colon will become markedly distended, but the small intestines usually will remain
normal.
Congenital short colon has been reported in the dog and cat. In these patients, the
cecum was located on the left and there was no demarcation of the ascending, transverse,
and descending colon. 403 The colonic mucosa was smooth, suggesting that the condition
was congenital rather than secondary to chronic colitis. Chronic colitis can also produce a
short colon; however, mucosal irregularities should also be present.