Case 2Case 2

Clinical dataClinical data

30-year-old male30-year-old maleTumorous mass in the rete Tumorous mass in the rete

testis/epididymis region. Duration 6 testis/epididymis region. Duration 6 monthsmonths

ExcisionExcision

1,3 x1,2 x0,8 cm1,3 x1,2 x0,8 cmWhitish on cut surphaceWhitish on cut surphace

Immunohistochemistry:Immunohistochemistry:

EMA, AE1-AE3: positiveEMA, AE1-AE3: positive

CEA, CD 34: negativeCEA, CD 34: negative

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Caterpillar of moth Actias cf. selenae

Our diagnosisOur diagnosis

Adenomatoid tumorAdenomatoid tumor

A very peculiar and constant feature A very peculiar and constant feature isis presence presence of thin intraluminal of thin intraluminal bridging strandsbridging strands

Bridging strands aBridging strands are so thin that resembled re so thin that resembled lipocytes of adipose tissue lipocytes of adipose tissue

StrandsStrands bridged lumina of numerous tubular bridged lumina of numerous tubular and slit-like structures and formed fine and slit-like structures and formed fine inconspicuous network in some cases.inconspicuous network in some cases.

Bridging strands are present constantly in ATs.Bridging strands are present constantly in ATs.

UltrastructureUltrastructure

UltrastructurallyUltrastructurally, bridges a, bridges are formed by re formed by apposition of attenuated cytoplasm of two apposition of attenuated cytoplasm of two adjacent cells. adjacent cells.

Luminal surfaces Luminal surfaces aare covered by short, re covered by short, narrow, occasionally branched or bushy narrow, occasionally branched or bushy microvilli confirming their mesothelial microvilli confirming their mesothelial origin origin

UltrastructureUltrastructure