Page 493 - Atlas of Small Animal CT and MRI

Figure 4.6.31 Mucinous Adenocarcinoma with Osseous Metaplasia (Canine) CT

10y Jack Russell Terrier with progressively
worsening nonproductive cough. There are
multiple mineral‐attenuating masses in the
left caudal, right middle, and right caudal
lung lobes on survey radiographs (a). Masses
are highly yet incompletely mineralized on
CT images, creating a complex multilobular
appearance (b,d). Pathologic diagnosis fol-
lowing lung lobectomy was mucinous adeno-
carcinoma with extensive osseous metaplasia
(c). The origin of the primary tumor was not
determined.

(a) DX, DV (b) CT, TP

(c) GP (d) CT, TP

Figure 4.6.32 Maximum‐Intensity Projection Imaging for Detection of Small Metastases (Canine) CT

(a) CT, TP (b) CT, TP (c) CT, MIP, TP
11y FS Australian Cattle Dog with bronchoalveolar carcinoma with distant metastasis to other lung lobes. Representative CT images of
the right caudal lung lobe were all acquired at the same level and include a 5 mm collimated image (a), a 1 mm collimated image (b),
and a 15 mm thick maximum‐intensity projection (MIP) image (c). Small peripheral miliary metastatic nodules are difficult to see on the
5 mm collimated image because of reduced contrast from partial volume averaging with aerated lung (a). A few nodules are seen on the
1 mm collimated image, but the number of images required to view the entire thorax makes thin collimation impractical for metastasis
screening. Miliary nodules are clearly seen on the MIP image because of nearly complete elimination of partial volume averaging, and
the number of images required to view the entire thorax is reduced. Postmortem examination confirmed the diagnosis of bronchoalveolar
carcinoma arising from the left cranial lung lobe with bronchial migration and distant metastasis to other lobes.
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