Primary Thymic Malignant Melanoma.

Area of Science:

• Thoracic Surgery
• Oncology
• Pathology

Background:

• Primary thymic malignancies are rare, with malignant melanoma being an exceptionally infrequent diagnosis.
• Early detection and complete surgical resection are critical for managing anterior mediastinal tumors.

Observation:

• A 72-year-old female presented with a 20-mm anterior mediastinal tumor.
• The tumor exhibited smooth, progressive contrast enhancement and homogeneous density on imaging.
• Video-assisted thoracic surgery was performed for complete tumor removal.

Findings:

• Pathologic examination confirmed malignant melanoma, positive for HMB-45 and S-100 markers.
• Postoperative positron emission tomography (PET) showed no evidence of metastatic disease.
• The diagnosis of primary malignant melanoma of the thymus was established.

Implications:

• This case highlights the possibility of primary thymic melanoma, a highly aggressive neoplasm.
• Complete resection and vigilant postoperative surveillance are essential for preventing recurrence.
• Further research into the pathogenesis and optimal management of primary thymic melanoma is warranted.