Malignant Leydig cell tumor: clinical, histologic and electron microscopic features

Area of Science:

• Endocrinology
• Oncology
• Pathology

Background:

• Leydig cell tumors are rare testicular neoplasms.
• Understanding their ultrastructural characteristics aids in diagnosis and prognosis.

Observation:

• A 51-year-old male presented with a malignant Leydig cell tumor.
• Elevated serum estrone, androstenedione, and urine chorionic gonadotropin were noted.
• Neoplasm ultrastructure showed nuclear pleomorphism and lacked Reinke's crystals, differing from benign Leydig cell tumors.

Findings:

• Abundant smooth endoplasmic reticulum and mitochondria with tubular cristae indicated enhanced secretory activity.
• These ultrastructural findings correlated with biochemical evidence of increased hormone production.
• The tumor cells exhibited distinct ultrastructural features consistent with Leydig cell origin.

Implications:

• Ultrastructural analysis is a valuable tool for diagnosing Leydig cell tumors.
• Identifying specific ultrastructural markers can help differentiate malignant from benign Leydig cell tumors.
• This case highlights the importance of integrating ultrastructural and biochemical data in testicular tumor diagnosis.