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Malignant primitive neuroectodermal tumor presenting as a scalp nodule.

C M Jacinto¹, J M Grant-Kels, D R Knibbs

¹Department of Medicine, Hartford Hospital, Connecticut.

The American Journal of Dermatopathology

|February 1, 1991

Summary

A rare malignant epithelioid schwannoma mimicked a benign scalp lesion in a young woman. Diagnosis required advanced techniques like immunohistochemistry and ultrastructural examination for this undifferentiated neoplasm.

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Area of Science:

Dermatopathology
Oncology
Surgical Pathology

Background:

Malignant epithelioid schwannoma is a rare soft tissue tumor.
Superficial tissue presentation is uncommon, often leading to diagnostic challenges.

Observation:

A 20-year-old woman presented with a 3-year history of a stable, benign-appearing cystic nodule on her scalp.
Excision revealed a malignant small round cell undifferentiated neoplasm.

Findings:

Immunohistochemistry suggested neural crest origin.
Ultrastructural examination confirmed schwannian differentiation.
Diagnosis was established as malignant epithelioid schwannoma of superficial tissue, also known as neurotropic or desmoplastic melanoma.

Implications:

Related Experiment Videos

This case highlights the diagnostic difficulties associated with rare malignant tumors presenting as seemingly benign lesions.
Specialized techniques are crucial for accurate diagnosis and appropriate patient management.
Understanding the immunohistochemical and ultrastructural features aids in differentiating this neoplasm from other small round cell tumors.