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Agressive Brain Lesion in a 4-Year-Old FS Mixed Breed Canine: Our Case Of the Month March 2018

Case Of the Month

Agressive Brain Lesion in a 4-Year-Old FS Mixed Breed Canine: Our Case Of the Month March 2018

The patient was presented for trouble seeing and staring into space. She appeared to respond well to steroids. Recent blood work was essentially normal.

The patient was presented for trouble seeing and staring into space. She appeared to respond well to steroids. Recent blood work was essentially normal.

DX

Biologically aggressive mass lesion of the right calvarium with aggressive osteolysis of the right temporal, occipital and sphenoid bone, extensive perforation of the cranial fossa and marked mass effect on the brain. Lymphadenomegaly of the right medial retropharyngeal lymph node.

Outcome

Main differential diagnoses are osteosarcoma, chondrosarcoma,multilobulated tumor of bone (chondrosarcoma rodens) and squamous cell carcinoma.
The lymph node changes are suggestive for metastatic spread.
Final diagnosis would require sampling of the primary tumor for histology and fine needle aspiration of the lymph node.
The lesion is not resectable. The long term prognosis is poor.
However, staging and palliative treatment such as tumor irradiation could be considered depending on the owner’s wishes.

Image Interpretation

A large irregular soft tissue attenuating mass lesion is associated with the right temporal bone. The mass lesion presents stippled to amorphous mineralization. Extensive permeative osteolysis of the right temporal bone – including the zygomatic process and right tympanic bulla – with perforation of the cranial fossa is seen. The mass lesion presents marked extension into the cranial fossa, causing an extraaxial mass effect with distortion of the brain and a midline shift of the cerebral falx to the left. The mass lesion extends into the caudal part of the cranial fossa, the adjacent occipital bone presents permeative osteolysis as well. The  medial extension is up to the level of the right orbital fissure and aggressive osteolysis of the right sphenoid bone is seen.

The right medial retropharyngeal lymph node is moderately enlarged with mildly irregular contrast enhancing.

Patient Information

Patient Name : Cassie Zvolensky Rockaway Feb 19 2018
Gender : Female, Spayed
Species : Canine
Status : Complete
Code : 16_00169

Clinical Signs

  • "Not Doing Right"

Exam Finding

  • Neurologic signs

Images

marked_intracranial_screen_shot_2018-02-28_at_5mass_lesion_screen_shot_2018-02-28_at_5enlarged_med_retro_lnscreen_shot_2018-02-28_at_5

Clinical Signs

  • "Not Doing Right"