Page 34 - Atlas of Small Animal CT and MRI

24 Atlas of Small Animal CT and MRI

Figure 1.1.24 Nasal Osteosarcoma (Canine) CT

(a) CT, TP (b) CT, TP (c) CT, TP
11y FS Rottweiler with a 3‐month history of sneezing and epistaxis. Representative transverse images are all at the same anatomic level
in the midnasal cavity. Images a and b are the same image presented in a wide and a narrow window, respectively. A partially mineralized
soft‐tissue mass fills the left nasal cavity, with the extent of mineralization best seen in the narrowly windowed image (b: arrows). There
is also associated destruction of the hard palate (a: large arrow) and productive reactivity of the maxilla (a: small arrows). The mass
heterogeneously contrast enhances. A nasal biopsy confirmed a highly aggressive and infiltrative osteosarcoma.

Figure 1.1.25 Osteochondrosarcoma (Canine) CT

(a) CT, TP (b) CT, TP (c) CT, TP

5y MC Labrador Retriever with nasal discharge and stertor. There is a smoothly margined mineralized mass occupying the midnasal
cavity. This mass extends ventrally through a bony defect at the rostral aspect of the palatine bone, and there is associated destruction
of the nasal septum (b: arrow). Moderate fluid accumulation in the caudal nasal cavity and the left frontal sinus is also evident (c). This
mass has the stippled, granular imaging features characteristic of multilobular osteochondrosarcoma. Although these neoplasms most
commonly originate from flat bones comprising the calvarium, they have also been reported to arise from the hard palate.

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