Page 486 - Atlas of Small Animal CT and MRI

Figure 4.6.20 Pneumocystis carinii Mycotic Pneumonia (Canine) CT

(a) XC (b) DX, DV (c) DX, DV

(d) CT, TP (e) CT, TP

2y FS Dachshund with a 4‐month history of exercise intolerance (a). There are moderate to marked diffuse interstitial infiltrates in the
lung fields on the radiographic examination (b,c). A diffuse ground‐glass pattern is seen on CT images (d), with an average attenuation
of approximately −650 HU in the ventral lung fields. There is a more lucent reticulated pattern in the most dorsal regions of the lung (e).
Bronchoalveolar lavage cytology was consistent with Pneumocystis carinii infection.

Figure 4.6.21 Paragonimus Parasitic Pneumonia (Canine) CT

(a) CT, TP (b) CT, TP
10y FS Kelpie with a mass involving the left optic nerve. Thoracic radiographs reveal a solitary pulmonary nodule in the right caudal lung
lobe. Image b represents a magnification of image a. A well‐demarcated soft‐tissue attenuating mass is seen immediately dorsal to the
caudal vena cava (a,b: arrow). Focal mineralization is present at the periphery of the mass (b: arrowhead). Increased attenuation and
volume depletion in the accessory lobe and the dependent part of the right caudal lung lobe (a: arrowheads) are indicative of a combina-
tion of alveolar infiltrates and atelectasis. Microscopic evaluation of the pulmonary mass following lung lobectomy revealed a focal
granulomatous pneumonia containing an aggregate of cysts filled with fluke eggs. The optic nerve mass proved to be a meningioma
unrelated to the pulmonary lesion.