Small Animal Radiology and Ultrasound: A Diagnostic Atlas and Text

442 Small Animal Radiolo g y and Ultrasono graphy
Fig. 3-254 A 6-year-old male
Cocker Spaniel with a palpable caudal
abdominal mass detected on routine
physical examination. The
survey radiograph revealed three
distinguishable caudal abdominal
tissue densities. The cystogram was
performed to determine the position
of the urinary bladder. The mass
caudal to it was presumed to be the
prostate (black p). Differential diagnoses
for the mass cranial and ventral
to the opacified urinary bladder
include paraprostatic cyst, neoplasm
of the cranial bladder wall, splenic
mass, or other forms of neoplasia.
Diagnosis: Paraprostatic cyst.
Fig. 3-255 A 5-year-old male
Doberman Pinscher with a palpable
caudal abdominal mass detected on
routine physical examination. The
lateral radiograph revealed the colon
filled with fecal material, the bladder
(black b) displaced cranially, moderate
prostatomegaly (black p), and a
mass (black arrows) with a calcified
rim (eggshell calcification) between
the bladder and colon. Differential
diagnoses include paraprostatic cyst
or neoplasm arising from the margin
of the colon, prostate, or bladder.
Diagnosis: Paraprostatic cyst.
U LT R A S O N O G R A P H Y O F P R O S TAT I C A B N O R M A L I T I E S
Ultrasonography is well suited for evaluation of the prostate. 55,873-877 Provided the
prostate is not too deeply positioned within the pelvic canal, it can be examined easily. A
specific diagnosis can be made in only a few cases, but the number of possible diagnoses
can be reduced based on the ultrasonographic features. Ultrasonography may also be
used for guidance during aspiration or biopsy of the prostate or for abscess or cyst
drainage. 57,875