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SYNOPSIS A kidney metastasis from a squamous bronchogenic carcinoma is described that showed the unusual feature of occupying Bowman's On physical examination percussion revealed dullness over the right upper chest area, and bronchoscopy showed tumour protruding from the right upper lobe orifice. A scalene node biopsy was negative. An exploratory thoracotomy showed an unresectable carcinoma of the right lung. After the thoracotomy the patient went downhill and died on his 28th day in hospital. None of the laboratory data revealed pertinent findings.Necropsy showed a narrow right upper lobe orifice fixed by tumour which had invaded the bronchial wall, extending into the surrounding parenchyma. The hilar nodes were matted, enlarged, and replaced by tumour. The only other metastasis found was in the right kidney, in which a well-circumscribed, grey-white tumour nodule, 2 x 3 cm., was seen. The cut surface of the nodule appeared dry and granular.

A lesion which was an incidental finding in a paratesticular location is presented. Histologically it resembles a Brenner tumor. Histogenesis of this tumor is discussed in view of its unusual location and in view of the multiple theories offered in the literature. For working hypothesis, the Wolffian‐mesonephric duct remnants (appendage of epididymis) are accepted for its histogenesis, paralleling the theory of Berge and Borglin for Brenner tumors occurring in women.

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