Rhabdomyosarcoma in a prehensile-tailed porcupine

Area of Science:

• Veterinary Pathology
• Comparative Oncology
• Wildlife Neoplasia

Background:

• Neoplasms in exotic animals require thorough investigation.
• Rhabdomyosarcoma is a malignant tumor of muscle tissue.
• Previous reports of rhabdomyosarcoma in porcupines are absent.

Purpose of the Study:

• To document and characterize a case of rhabdomyosarcoma in a prehensile-tailed porcupine.
• To provide histopathological and immunohistochemical details of the tumor.
• To contribute to the understanding of neoplasia in this species.

Main Methods:

• Surgical debulking and histopathological examination of a mass in a porcupine.
• Postmortem examination to assess tumor extent.
• Immunohistochemical analysis using myogenin, MyoD1, vimentin, smooth muscle actin, and desmin.

Main Results:

• A poorly differentiated neoplasm was surgically debulked.
• Postmortem examination revealed an invasive mass encircling the ear canal and invading bone.
• Histopathology and immunohistochemistry confirmed the diagnosis of rhabdomyosarcoma, with positive staining for muscle markers.

Conclusions:

• Rhabdomyosarcoma is a newly identified tumor type in prehensile-tailed porcupines.
• The tumor exhibited aggressive, infiltrative behavior.
• This case highlights the importance of considering rhabdomyosarcoma in differential diagnoses for similar presentations in porcupines.