Infiltrating pituitary neoplasms in the rat

Area of Science:

• Veterinary Pathology
• Neuro-oncology
• Rodent Models in Research

Background:

• Pituitary neoplasms are uncommon in laboratory rats.
• Understanding spontaneous tumor development is crucial for interpreting research findings.

Purpose of the Study:

• To report and characterize spontaneous pituitary neoplasms in rats.
• To document the incidence of pituitary neoplasms with brain infiltration.

Main Methods:

• Retrospective review of animal health records.
• Pathological examination of pituitary tissues.
• Histological analysis for neoplastic growth and invasion.

Main Results:

• Eleven cases of spontaneous pituitary neoplasms were identified.
• These neoplasms demonstrated infiltration into adjacent brain tissue.
• The overall incidence of such tumors was approximately 0.42%.

Conclusions:

• Spontaneous pituitary neoplasms with brain invasion occur rarely in rats.
• These findings highlight the importance of considering spontaneous pathologies in rodent research.
• Further investigation into the etiology of these neoplasms may be warranted.