Conclusion
A rapidly growing mass within the axillary fossa arising from the peripheral nerves may be a similar presentation of wide spectrum of tumors. Highly malignant behavior of pPNET makes it an important differential diagnosis to be considered despite its low incidence.
Conflict of Interests: The authors declare that they have no competing interests.
Funding/Support: No funding was received.
Authors contribution: All authors contributed equally to this work.
Acknowledgment: We also thank Keyvan Kheradmand (MD) and Zhoubin Souri (MD) for their invaluable comments.