الفهرس 
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Abstract
Testes are nonpalpable when they are intracanalicular or intraabdominal and never emerge through the external inguinal ring, or when they are atrophic dysgenetic or absent. The incidence of clinically nonpalpable testes is approximately 20% of an undescended testis population. Nonpalpable undescended testes differ from other variaties of incomplete testicul,ar descent in; their improbability of spontaneous descent, they are usually smaller in volume, and their malignant degeneration is much more common. In addition, surgical placement of the testis in the most dependent part of the scrotum is less frequently accomplished successfully. Approximately 20% of nonpalpable testes are absent. Bilateral ,absence of the testis can be predicted in normal phenotypic male subjects with 46XY karyotype when both L.H. and F .S.H. levels are elevated and no rise of testosterone level occurs after H.C.G. stimulation. Unilateral absence of the testis’ can be predicted when the epsilateral testis volume is significantly larger than the mean volume for age, and the stimulated testosterone level is above standard levels. There are no reliable endocrine or other tests that exclude the presence of a viable, dysgenetic or atrophic testis and surgical exploration is essential in all cases with non palpable testes.