Extradigital glomus tumor: dermoscopic description and histopathological correlation

Area of Science:

• Dermatology
• Oncology

Background:

• Glomus tumors are rare benign neoplasms originating from glomus bodies.
• Typically presenting as painful, angiomatous papules on the extremities, often subungual.

Observation:

• This case report focuses on an unusual extradigital glomus tumor located on the left arm.
• The lesion presented diagnostic challenges due to its rare location.

Findings:

• Dermoscopic examination revealed characteristic angiomatous lagoons.
• A novel finding was the presence of these lagoons being circumscribed by a pale halo, a feature not previously documented in extradigital glomus tumors.

Implications:

• The identification of this unique dermoscopic feature can aid in the diagnosis of rare extradigital glomus tumors.
• This finding expands the understanding of glomus tumor presentations and diagnostic criteria.