Cystic rete testis in a central bearded dragon (Pogonavitticeps)

Area of Science:

• Veterinary Pathology
• Reptile Reproductive Biology
• Comparative Anatomy

Background:

• The rete testis is a network of channels crucial for sperm transport from seminiferous tubules to efferent ductules.
• Cystic rete testis is characterized by uni- or multilocular cysts with specific epithelial lining and stromal features.
• This condition has primarily been documented in mammalian species.

Purpose of the Study:

• To document and characterize the first reported case of cystic rete testis in a non-mammalian vertebrate, a central bearded dragon (Pogona vitticeps).
• To histologically analyze the cystic mass and determine its potential origin and classification (primary vs. secondary).

Main Methods:

• Surgical excision of a coelomic mass from an 11-year-old male bearded dragon.
• Gross examination of the excised mass.
• Histopathological analysis of the cystic mass, including cyst lining, stroma, and relationship with seminiferous tubules.
• Evaluation of spermatogenesis within adjacent seminiferous tubules.

Main Results:

• A 6-cm diameter yellow mass composed of multiple cysts (0.5-3.0 cm) filled with fluid was identified.
• Histology revealed cysts lined by simple cuboidal to flattened epithelial cells, with occasional connections to seminiferous tubules.
• Approximately 10% of seminiferous tubules were dilated, but all showed normal spermatogenesis, with no signs of inflammation.
• The findings are consistent with a primary cystic rete testis, as spermatozoa appeared able to escape.

Conclusions:

• This case represents the first documented instance of cystic rete testis in a reptile.
• The histological features and presence of normal spermatogenesis suggest a primary etiology, distinct from secondary obstruction.
• This finding expands the known spectrum of reproductive pathologies in reptiles.