Granular Cell Dermatofibroma: When Morphology Still Matters.

Area of Science:

• Dermatopathology
• Oncology

Background:

• Dermatofibromas, also termed fibrous histiocytomas, are frequent cutaneous soft-tissue tumors.
• Numerous variants exist, necessitating careful histological evaluation to distinguish them from potentially aggressive neoplasms.

Purpose of the Study:

• To highlight the importance of recognizing dermatofibroma variants.
• To discuss the diagnostic challenges posed by atypical cellular changes in dermatofibromas.
• To present a case of a rare granular cell variant of dermatofibroma.

Main Methods:

• Histopathological examination of cutaneous lesions.
• Review of literature on dermatofibroma variants.
• Immunohistochemical investigations for complex cases.

Main Results:

• Dermatofibromas exhibit diverse histological features, with variants sometimes coexisting within a single lesion.
• Atypical cellular changes can complicate diagnosis, often requiring immunohistochemistry.
• The granular cell variant of dermatofibroma was identified in the presented case.

Conclusions:

• Accurate identification of dermatofibroma variants is essential for appropriate clinical management.
• Immunohistochemistry aids in the correct classification of complex dermatofibroma cases.
• Awareness of variants like the granular cell type improves diagnostic accuracy.