True hermaphroditism: sonographic demonstration of ovotestes.

A 15-year-old boy with normal external genitalia presented with severe bilateral gynecomastia, intermittent painful scrotal swelling, and a recent history of scrotal trauma. Ultrasound (US) revealed testicles of normal size with diffusely heterogeneous echotexture due to scattered cysts. Ovotestes were found at surgery and pathologic examination. Bilateral partial gonadectomies were performed. Four months later he had testicular pain and swelling. US revealed bilateral multiseptate cystic masses. After repeat surgery, he is now free of symptoms. The diagnosis of true hermaphroditism and ovotestis should be considered in a phenotypic male adolescent with gynecomastia when testicular parenchyma is heterogeneous at US because of multiple scattered cysts.

Dissociation of cellular transformation from platelet-derived growth factor independence.

ST2-3T3, a spontaneously transformed BALB/c-3T3 cell line which does not require platelet-derived growth factor (PDGF) for growth, was fused to THO2, a PDGF-responsive non-transformed BALB/c-3T3 cell line, in order to learn whether transformation is expressed coordinately with PDGF independence. Hybrid cells were selected and grown in medium containing both HAT (hypoxanthine-aminopterin-thymidine) and ouabain; unfused cells of each parental type were killed in HAT-ouabain medium. Five independently isolated ST2-3T3xTHO2 hybrid cell lines were established and characterized for both transformation and PDGF responsiveness. All five were transformed, having a disorganized growth pattern and achieving a final cell density similar to that of ST2-3T3 cells. Two of these lines did not respond to a brief treatment with PDGF: the mitogen neither induced the synthesis of a PDGF-modulated lysosomal protein (termed MEP), nor stimulated the cells to enter the S phase; one line responded to PDGF by synthesizing both MEP and DNA, whereas two others synthesized MEP but not DNA. In contrast, four independently isolated cell lines obtained by fusing PDGF-responsive non-transformed BALB/c-3TC cells to the THO2 line were all PDGF-responsive for both MEP and DNA synthesis and were not transformed. It appears that PDGF independence is not required for the transformation of BALB/c-3T3 cells.