Page 484 - Atlas of Small Animal CT and MRI

Figure 4.6.17 Pulmonary Abscess (Canine) CT

(a) CT, TP (b) CT, TP (c) CT, TP
8y MC Dalmatian with 2‐month history of intermittent coughing. Images a and b are soft‐tissue and lung windowed images at approxi-
mately the same level in the cranial thorax. Image c is caudal to image b. A large, partially fluid‐filled, thick‐walled oval cavitary mass is
seen in the caudal part of the left cranial lung lobe (a,b: arrows). Diffuse mediastinal and subcutaneous edema is evident in close associa-
tion with the mass (a: arrowheads). Regional alveolar infiltrates (c: small arrow) and focal pleural effusion (c: arrowheads) are also
present caudal and adjacent to the mass. The cavitary lesion was found to be partially filled with hemorrhagic fluid at the time of lung
lobectomy. Microscopic evaluation of the abscess capsule and adjacent lung revealed a marked inflammatory response. Ancillary CT find-
ings were due to mediastinitis, pleuritis, and subcutaneous cellulitis.

Figure 4.6.18 Pyogranulomatous Pneumonia (Feline) CT

(a) DX, DV (b) DX, DV

(c) CT, TP (d) CT, TP (e) CT, TP
13y FS Domestic Shorthair with progressive cough and weight loss. Images b and e are magnifications of a and d, respectively.
Radiographs reveal widespread, irregularly margined and coalescing nodules of varying size in all lung lobes (a,b). Similar findings are
present on representative CT images (c–e). Bronchoalveolar lavage cytology was interpreted as pyogranulomatous inflammation. The
underlying cause of the pyogranulomatous pneumonia was not determined but thought to be infectious. Tests for feline coronavirus,
Toxoplasma gondii, Dirofilaria immitis, Mycoplasma, bacteria, and fungal organisms were all negative.