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case_images: Ultrasonography of paratesticular lesion showing hyperechoic cystic regions with multiple septations.
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case_images: He underwent ultrasonography of his testes which showed a large left sided cystic area 16.6 x 8.2 x 8.8 cm3 with multiple septations and hyperechoic areas (Fig. 1).
case_images: Multicystic surgical specimen received for examination.
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case_images: Macroscopic examination of the surgical specimen revealed an atrophic testis 40 x 30 x 30 mm3 with a large, multiloculated structure adherent to it composed of cysts of varying sizes containing serous fluid ~60 mm in maximal dimension (Fig. 2).
case_images: Haematoxylin and eosin staining showing thin-walled cystic areas lined by cuboidal mesothelial cells.
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case_images: No atypia, mitoses or necrotic regions were observed (Fig. 3).
case_images: WT-1 immunohistochemical staining.
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case_images: Immunohistochemistry was undertaken and mesothelial cells were positive for WT-1 and calretinin (Figs 4 and 5) and negative for desmin in keeping with a diagnosis of BMM (Fig. 6).
case_images: Calretinin immunohistochemical staining.
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case_images: Immunohistochemistry was undertaken and mesothelial cells were positive for WT-1 and calretinin (Figs 4 and 5) and negative for desmin in keeping with a diagnosis of BMM (Fig. 6).