[Testicular teratoma with meningothelial elements].

Area of Science:

• Urology
• Pathology
• Oncology

Background:

• Teratomas are germ cell tumors containing diverse tissue types.
• Mature adult teratomas of the testicle are rare, particularly those with complex differentiation.

Observation:

• A case of a mature adult teratoma of the right testicle in a 34-year-old man is presented.
• Microscopic examination revealed well-differentiated gut and respiratory epithelium, epidermis, skin adnexa, meningothelial cell proliferation with psammoma bodies, peripheral nerve, and glial tissue.

Findings:

• Immunohistochemical analysis showed meningothelial cells positive for EMA and claudin, and negative for S-100-protein, cytokeratins, desmin, and chromogranin A.
• Glial tissue within the teratoma also showed specific positive staining.

Implications:

• This case expands the understanding of the diverse histological components possible in testicular teratomas.
• The presence of meningothelial and glial elements highlights the complex differentiation potential of germ cells.
• Further research into the pathogenesis of such complex teratomas may inform diagnostic and therapeutic strategies.