Collection of Rare Peripheral Nerve Tumors-Insights from the German Registry

Area of Science:

• Oncology
• Neuropathology
• Radiology

Background:

• Schwannomas and neurofibromas are the most common benign peripheral nerve tumors.
• Rare intrinsic and extrinsic lesions can clinically and radiologically mimic these common tumors.

Purpose of the Study:

• To analyze a cohort of rare tumors and lesions mimicking peripheral nerve tumors.
• To provide an overview of their pathology, imaging, and clinical presentation.
• To highlight the challenges in preoperative differentiation.

Main Methods:

• Retrospective analysis of 61 cases from the German Peripheral Nerve Tumor Registry (PNTR).
• Inclusion of surgically treated patients from three high-volume centers.
• Review of histopathological diagnoses, imaging features, and clinical data.

Main Results:

• The cohort included diverse entities: malignant peripheral nerve sheath tumors (MPNSTs), perineurioma, hybrid nerve sheath tumors (HPNSTs), and ANNUBP.
• Extrinsic lesions comprised lymphoma, lymphangioma, hemangioma, solitary fibrous tumor, and metastatic disease.
• Preoperative differentiation between benign and rare tumors was often not definitive.

Conclusions:

• Accurate preoperative diagnosis of rare peripheral nerve tumors is challenging.
• Clinical examination and subtle imaging findings may suggest rare entities.
• Multidisciplinary collaboration among specialists is crucial for optimal patient management.