Atypical Vascularity Within a Schwannoma.

Area of Science:

• Oncology
• Pathology
• Radiology

Background:

• Schwannomas are typically benign nerve sheath tumors.
• Internal vascularity on imaging is often associated with malignant neoplasms.
• Aberrant anatomical presentation can complicate diagnosis.

Purpose of the Study:

• To report an uncommon case of a benign schwannoma with internal vascularity.
• To highlight the diagnostic challenges posed by atypical imaging findings.
• To review the existing literature on schwannoma presentations.

Main Methods:

• Case report of a patient with a dorsolateral schwannoma.
• Ultrasonography to assess tumor vascularity (peripheral and internal).
• S100 immunohistochemical staining for definitive diagnosis.

Main Results:

• The schwannoma demonstrated both peripheral and internal vascularity on ultrasonography.
• Despite concerning internal vascularity, S100 staining confirmed a benign schwannoma.
• The tumor's dorsolateral anatomical location was atypical.

Conclusions:

• Internal vascularity does not exclusively indicate malignancy in schwannomas.
• Atypical imaging findings require careful histopathological correlation.
• This case underscores the importance of immunohistochemistry in diagnosing nerve sheath tumors.