Table 4.
Description of the MRI signal characteristics of the identified lesions. All signals are presented with respect to the normal grey matter. FLAIR, fluid attenuated inversion recovery; T2 */SWI, susceptibility weighted imaging, indicating presence (yes) or absence (no) of signal voids; DWI, diffusion weighted imaging; ADC, apparent diffusion coefficient. The “\” symbol indicates that the sequence was not performed. In cases #3,4,10,13,14,15,16,17,18,19, MRI was not performed.
| Signalment | T1-Weighted | T2-Weighted | FLAIR | T2*/SWI | DWI | ADC | Contrast Enhancement |
MRI Diagnosis |
|---|---|---|---|---|---|---|---|---|
| 1. Mixed breed MN, 9.75 y, 24.6 Kg | Homogeneous isointense | Heterogeneous isointense | Heterogeneous isointense | No | Hyperintense | Hypointense | Heterogeneous | Pituitary mass with different stages of intralesional haemorrhage |
| 2. Italian hound F, 11.5 y, 14.8 Kg |
Heterogeneous isointense | Heterogeneous isointense | Heterogeneous isointense | Yes | Hyperintense | Hypointense | Heterogeneous | Pituitary mass with intralesional haemorrhage |
| 5. Mixed breed FN, 12.7 y, 30 Kg |
Homogeneous isointense | Heterogeneous isointense | Heterogeneous isointense | Yes | Isointense | Isointense | Heterogeneous | Pituitary mass with intralesional haemorrhage |
| 6. Beagle FN, 7.6 y, 16.6 Kg |
Heterogeneous hypointense | Heterogeneous hyperintense | Heterogeneous hyperintense | Yes | Hypointense | Hypointense | Heterogeneous | Pituitary mass with intralesional haemorrhage |
| 7. Labrador Retriever F, 5 y, 31.2 Kg |
Heterogeneous hypointense | Heterogeneous hyperintense | Heterogeneous hyperintense | \ | Hypointense | Hyperintense | Heterogeneous | Pituitary mass with intralesional haemorrhage |
| 8. Labrador Retriever FN, 10.8 y, 35 Kg |
Heterogeneous hypointense | Heterogeneous hyperintense | Heterogeneous hyperintense | No | \ | \ | Heterogeneous | Pituitary mass |
| 9. Mixed breed FN, 5.8 y, 21 Kg | Heterogeneous hypointense | Heterogeneous hyperintense | Heterogeneous hyperintense | Yes | \ | \ | Heterogeneous | Pituitary mass with intralesional haemorrhage |
| 11. Boxer FN, 11.4 y, 27.4 Kg |
Homogeneous hyperintense | Heterogeneous hyperintense | Heterogeneous hyperintense | \ | \ | \ | Heterogeneous | Pituitary mass with intralesional haemorrhage |
| 12. Springer Spaniel M, 13.7 y, 18.7 Kg |
Heterogeneous isointense | Heterogeneous hyperintense | Heterogeneous hyperintense | Yes | Hypointense | Hyperintense | Heterogeneous | Pituitary mass with intralesional haemorrhage |