Solitary or predominantly right-sided varicocele: a possible sign of situs inversus.

Among more than 850 patients undergoing outpatient sclerotherapy of the internal spermatic vein, only 1 unilateral and 1 predominantly right-sided varicocele were encountered. In both patients with this finding a total situs inversus was present, with inversion of normal anatomy, enlarged "right" internal spermatic vein draining into the renal vein, and the "left" internal spermatic vein entering the inferior vena cava directly. Total situs inversus should be considered whenever right-sided varicocele is solitary or predominant.