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Книги по МРТ КТ на английском языке / MRI and CT of the Female Pelvis Hamm B., Forstner R..pdf
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R. Forstner

 

 

patient triage for appropriate surgery or radiation therapy in selected cases (Kyriazi et al. 2010). Usually only patients with limited recurrent pelvic disease may be considered as candidates for cytoreductive surgery. Furthermore, patients can be selected who will benefit from a relieving colostomy (Birrer 2016). CT has been widely used for the assessment of recurrent ovarian cancer. MRI assists in predicting tumor resectability, particularly in the pelvis (Forstner et al. 2010). PET/CT is particularly useful in assessing persistent ovarian cancer and serves as a complementary imaging technique when tumor markers are rising and CT or MRI findings are inconclusive or negative (Mitchell et al. 2013; Iver and Lee 2010). It is superior to the other imaging techniques in assessing small implants, in differentiation metastases from scar tissues (Fig. 21). Although PET/MRI shows promising results and seems superior to PET/CT in advanced gynecological tumors, its value has still to be assessed (Queiroz et al. 2015).

a

7.4.2\ Nonepithelial Ovarian

Malignancies

Malignant Germ Cell Tumors

Malignant germ cell tumors are much less common than epithelial ovarian neoplasms. Although germ cell ovarian malignancies account for only 2–3% of all ovarian malignancies, their clinical importance is based upon their potential for cure and the typical age distribution (Ozols et al. 2001). In women younger than 20 years of age, they account for approximately two-thirds of all ovarian malignancies. They are often very large solid tumors with rapid and predominantly unilateral growth. The most frequent sites of dissemination are the peritoneum and retroperitoneal lymph nodes. Compared with epithelial tumors, they have a greater tendency for hematogenous metastases, and liver and lung involvement can be observed at diagnosis. Ascites is only found in approximately 20% of cases (Ozols et al. 2001). Histologically they mostly occur in pure forms.

b

Fig. 22  Endodermal sinus tumor in a 14-year-old girl. Sag T2WI (a) and transaxial Gd T1FS (b). A large unilateral ovarian mass extends to the upper abdomen. It is well delineated but displays a very inhomogeneous architec-

ture with areas of necrosis, hemorrhage, and solid well-­ vascularized elements. AFP levels were markedly elevated. B bladder. Ascites (*)