Page 358 - Feline diagnostic imaging

366 22 Gastrointestinal Disease

(a) (b)

Figure 22.18 Ultrasound images of a 19-year-old domestic shorthair with intermittent vomiting. The cat had an ileocolic mass that
was confirmed as diffuse large centroblastic lymphoma at necropsy. (a) The small intestinal wall is greatly thickened at 0.5 cm
between the calipers. No wall layers are apparent and the wall is decreased in echogenicity. (b) In another image, the small intestinal
wall is greatly thickened with a loss of wall layering. An arrow indicates gas in the lumen.

(a) (b)

(c)

Figure 22.19 Ultrasonography of adenocarcinoma in the jejunum of an 11-year-old domestic longhair. Radiographs were
unremarkable. (a) A longitudinal ultrasound image shows the wall thickened at 0.594 cm between the calipers. Wall layers cannot be
distinguished. (b) In this transverse image, the wall measured 0.532 cm. (c) There was moderate enlargement of one of the adjacent
lymph nodes. An arrow indicates the tip of the needle during ultrasound-guided aspiration.
has a fixed rigid appearance so that abnormalities are mentioned above [42], a mass was found in all 16 cats that
unchanged between images made early in the study and underwent sonography. In cats with lymphoma [17], the
those made later. key sign is a loss of wall layering (Figure 22.22). Often the
Ultrasonography is invaluable for detection of intestinal intestinal wall is thickened and echogenicity is altered. The
neoplasia. In the study of feline intestinal adenocarcinoma wall may be hypoechoic but there may be areas of increased