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Anorchidism
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- Both monorchidism and testicular regression syndrome display similar histologic features:
- absence of testicular parenchyma
- presence of vas deferens, epididymis, or small groups of seminiferous tubules (69-83% of cases)
- spermatic vessels are small in 83% of cases
- areas of dystrophic calcifications, hemosiderin deposition, or giant cell reaction may be found within the mass that is noted instead of a testis
- Etiology: two hypotheses have been proposed: either it represents a primary anomaly of the gonad or it represents atrophy of the testis secondary to a vascular lesion, such as thrombosis or intrauterine torsion -- a theory that may be supported by the common finding of hemosiderin in the area adjacent to the regressed testis...
- Associations:
- absence of the kidney
- cystic seminal vesicles
- ipsilateral renal dysgenesis
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