Small Animal Radiology and Ultrasound: A Diagnostic Atlas and Text

Chapter Five The Skull 641
Fig. 5-36 A 9-year-old female
Golden Retriever with seizures for 2
months. The lateral radiograph
revealed an irregularly round calcified
density replacing the normally
linear osseous tentorium cerebelli
(black arrow). This was confirmed
on the ventrodorsal view as well.
Differential diagnoses include primary
bone tumor, meningioma, and
metastatic tumor. Diagnosis:
Osteosarcoma.
Fig. 5-37 A 12-year-old male mixed
breed dog with polyuria and polydipsia
for 9 months and vomiting for
2 weeks. The lateral view of the skull
reveals a severely osteoporotic skull.
The teeth appear to be floating in
soft tissue rather than anchored in
the normal bone of the jaw.
Laboratory data revealed severe
azotemia. Diagnosis: Renal secondary
hyperparathyroidism.
of disease. The use of CT or MR imaging provides more detail than standard radiographs
but may not be readily available in many locations. Rhinoscopy and retroflexed endoscopy
have a higher sensitivity and specificity than radiography. 128
When evaluating the nasal passages, the presence or absence of soft-tissue density, masses,
or radiopaque foreign objects should be noted. The absence or presence and extent of
turbinate destruction should be evaluated. The overlying frontal bone and maxilla should
be examined for bony destruction or overlying soft-tissue masses. The radiograph should be
evaluated for evidence of extension of the lesion into the frontal sinus or into the calvarium.