Hepatoblastoma in a cat.

Area of Science:

• Veterinary Pathology
• Comparative Oncology
• Hepatic Neoplasms

Background:

• Hepatoblastomas are rare primary liver tumors originating from immature hepatic progenitor cells.
• Understanding their diverse cellular origins and markers is crucial for diagnosis and treatment.
• This case investigates a hepatoblastoma in an 8-year-old Abyssinian cat.

Observation:

• A hepatic mass was surgically biopsied from the cat.
• Histopathological examination revealed cords and sheets of neoplastic cells with varied morphology, including spindle cells.
• Ductal structures and rosettes were also noted within the tumor mass.

Findings:

• Immunohistochemical analysis showed neoplastic cells were positive for embryonic hepatocellular markers (alpha-fetoprotein, cytokeratin 8/18) and biliary markers (CK 7, CK 8/18, CK CAM5.2, vimentin).
• Cells were negative for Hepatocyte Paraffin 1, CK 20, and chromogranin A.
• Expression of CD56/neural cell adhesion molecule and neuroendocrine markers (protein gene product 9.5, synaptophysin) indicated a mixed phenotype.

Implications:

• This case highlights the complex and potentially mixed differentiation of feline hepatoblastoma.
• The findings contribute to the understanding of rare hepatic neoplasms in veterinary medicine.
• The aggressive nature of this tumor, evidenced by the cat's rapid decline, underscores the need for further research into feline liver cancers.