Subungual blue nevus with combined phenotypic features.

Area of Science:

• Dermatopathology
• Oncology

Background:

• Blue nail dyschromia encompasses diverse etiologies, including melanocytic and vascular origins.
• Subungual lesions require careful histopathological evaluation for accurate diagnosis.

Observation:

• A unique case of a subungual blue nodule presenting with pseudo-clubbed nail is described.
• Histopathological analysis revealed a dual component: a common blue nevus and a pigmented epithelioid melanocytoma.

Findings:

• The study identifies an unusual combination of melanocytic nevi within the subungual region.
• This specific presentation challenges typical diagnostic criteria for blue nail conditions.

Implications:

• This case expands the differential diagnosis for blue nail dyschromia.
• Understanding combined melanocytic tumors is crucial for appropriate clinical management and patient outcomes.