Pseudoneoplasms of the nervous system

Area of Science:

• Neuropathology
• Neuro-oncology
• Diagnostic challenges in neurology

Background:

• Pseudoneoplasms of the nervous system present diverse origins, including inflammatory, autoimmune, infectious, malformative, reactive, degenerative, and radiation-induced conditions.
• These lesions can be mistaken for true tumors due to overlapping clinical, neuroimaging, and histological features.
• Misinterpretation can lead to significant clinical mismanagement, particularly overtreatment, highlighting the need for careful diagnostic consideration.

Purpose of the Study:

• To illustrate 10 cases of nervous system pseudoneoplasms.
• To analyze the mechanisms underlying their tumor-like appearance.
• To discuss differential diagnostic strategies for these entities.

Main Methods:

• Comprehensive review of existing medical literature on nervous system pseudoneoplasms.
• Analysis of consultation case files from one of the authors.

Main Results:

• Pseudoneoplasms exhibit varied presentations that can closely resemble neoplastic processes.
• Differential diagnosis requires careful integration of clinical, imaging, and pathological data.
• Specific diagnostic pitfalls associated with these mimics were identified.

Conclusions:

• Accurate diagnosis of nervous system pseudoneoplasms is challenging.
• Maintaining a broad differential diagnosis is essential.
• Utilizing immunocytochemical, ultrastructural, and molecular genetic methods aids in correct diagnosis.