Page 319 - Feline diagnostic imaging

20.2 Selected rocedures 325
Figure 20.1 (a) Fully automated (double (a)
spring-fired) biopsy device for Tru-Cut
biopsies. Activation of one button
automatically extends the inner trocar,
followed immediately by the outer cutting
cannula. Disposable needles are used inside
the gun, as shown. (b) Semiautomatic (single
spring) Core biopsy device. The inner trocar is
pushed in manually. Activation of the button
results in automatic firing of the outer cutting
cannula.

(b)

hours later, as hemorrhage is the most common complica-
tion from a biopsy procedure [5,6]. Pneumothorax should
also be considered when lung is biopsied. Other potential
complications (abdominal biopsy) include peritonitis,
either focal or generalized, including bile peritonitis
from accidental perforation of the gallbladder. Hematuria is
another reported complication after renal biopsy.
Abdominal seeding of tumor cells after a biopsy of a malig-
nant mass has been reported, but appears to be very rare.
The incidence may be higher in transitional cell carcinomas
of the bladder. The overall complication rate of ultrasound‐
guided biopsy is low when correct technique is followed.
However, any ultrasound‐guided invasive procedure should
only be performed after practice and experience.

20.2 Selected Procedures

20.2.1 Thoracocentesis Figure 20.2 Longitudinal ultrasound image of the right

Ultrasound‐guided thoracocentesis is commonly per- hemithorax of a cat with chylous effusion. The needle (arrow)
has been placed in the pleural space which is widened with
formed, and is especially helpful when pleural fluid is anechoic pleural effusion (pl fl). The heart is noted deep to the
small in volume or is pocketed (Figure 20.2). The procedure pleural fluid.