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RESIDENT
CASE
STUDIES
October 23,
2003: Case 2 Table
of Contents | List
of Diagnoses | Case 1 | Case
2
69 year old black male with tumor of right
epididymus
Discussion by Karen Cline, DO
Adenomatoid tumor is a benign tumor in the
epididymis. It is the most common tumor of the epididymis, usually at the
lower pole, and is unilateral and solitary. It can also arise in the
spermatic cord, testicular tunics or uterus and fallopian tube.
Distribution: 20-40 years of age
Gross Appearance:
Solid, tan-gray white glistening tissue, well circumscribed, usually less
than 5 cm
Microscopic
Appearance:
- Network of round, oval or slit-like
tubules within a fibrous stroma
- The cells lining the tubules are flat to
columnar with abundant cytoplasm and a large amount of vacuolated
cytoplasm
- Clusters of cells or cords may also be
present
- The fibrous stroma may or may not
demonstrate hyalinization and smooth muscle
- Lymphod aggregates are usually present
within the tumor and at the periphery.
Diagnostic Criteria
- Network of round, oval or slit like
tubules
- Fibrous stroma
- Peripheral Lymphoid aggregates
Differential Diagnosis:
- Malignant Mesothelioma-high mitotic rate
- Adenocarcinoma of Rete Testis: rare, ill
defined mass at hilum
- Metastatic Carcinoma-usually bilateral,
frankly malignant cells
References:
- Haber M. et al, Differential diagnosis in surgical pathology, Copyright 2002.
- Talerman, A.et al, Pathology of the
Testis and its adnexa, Contemporary issues in surgical pathology,
volume 7, Copyright1986.
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