Ultrasound of scrotum
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‘Regressed’ or ‘Burnt-out’ Germ Cell Tumours - Widespread germ cell metastases but no primary tumour except for an area of calcification or fibrosis within an often atrophic testis may be encountered (91). The pathogenesis of this phenomenon may be the result of a high metabolic rate of the tumour, which outgrows its blood supply and involutes (92;93).
Figure 35 Mixed Germ Cell Tumour. A focal mass (arrow), a mixed germ cell tumour, is present at the upper aspect of the testis, heterogeneous but mainly high reflectivity and is not as clearly defined as a seminoma.
Figure 36 Embryonal cell tumour. Often a component of mixed germ cell tumours, this is an example of a pure embyronal cell tumour which is ill-defined and lobulated (arrow).
Figure 37 Teratoma. A large teratoma occupying the entire testis, demonstrating pockets of cystic change.