['In children with testicular masses characteristic ultrasonographic features may occasionally allow the preoperative determination of a benign process and permit a testis sparing procedure to be performed. Often the amount of normal parenchyma surrounding the mass may be seemingly negligible, which may prompt some investigators to wonder what a testis sparing procedure might realistically spare.', 'We retrospectively reviewed 7 consecutive patients with intratesticular lesions who underwent surgical exploration. Several of these children seemingly had complete replacement of the testis with the pathological process with little to no discernible normal parenchyma. The surgical technique involved delivery of the testis and control of the vessels. The capsule was incised and the normal parenchyma was bluntly separated to the level of the tumor. The mass was then mobilized circumferentially and enucleated intact. The residual parenchyma was reapproximated, the capsule was closed and the testicle was replaced in the scrotum. All patients were followed postoperatively by physical examination and ultrasonography.', 'The series consists of 7 children 10 to 188 months old (mean age 68). The final diagnosis was cystic teratoma in 4 cases, epidermoid tumor in 2 and a simple cyst in 1. Postoperative physical examinations revealed symmetrical testes. Postoperative ultrasonography demonstrated normal echo texture and testicular volumes. Furthermore, no tumor recurrence was detected.'] Does ultrasonography underestimate the volume of normal parenchyma in benign testicular masses?