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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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A. Schlattau et al.

 

 

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Fig. 11  Peritoneal pseudocyst on MRI. Transaxial (a) and coronal T2WI (b) show a multiseptate cystic bilateral mass. Imaging features typical of this entity include the

ovary (arrows) displayed at the wall or within a septum, thin septas, and the contour following the predefined anatomical space

4.1.3.2\ Differential Diagnosis

Particularly in CT differentiation of a pseudocyst from cystadenomas or ovarian cancer may be difficult due to internal septations and the murally located ovary mimicking a solid component within a cystic mass. Conforming to the peritoneal cavity and encasement rather than displacement of adjacent organs as well as a history of previous surgeries, PID, or Crohn’s disease are key elements for the correct diagnosis (Fig. 11).

4.1.4\ Theca Lutein Cysts

Theca lutein cysts are ovarian cysts that are lined by luteinized theca cells. They develop in patients with high levels of serum human chorionic gonadotropin and are associated with multiple gestations, trophoblastic disease, and pregnancies complicated by hydrops fetalis, or in patients with ovarian hyperstimulation syndrome (Fig. 12).

4.1.4.1\ Imaging Findings

Theca lutein cysts are typically large, bilateral multiseptate ovarian cysts composed of simple fluid. They may cause gross enlargement of the ovaries to 10–20 cm in diameter. T2-weighted images or contrast-enhanced

Fig. 12  Ovarian hyperstimulation syndrome in a 45-year-­ old female treated with tamoxifen. Bilateral enlarged ovaries with multiple thin-walled cysts are found. Some of these show hemorrhagic foci. Bladder (B). Ascites (asterisk)

MRI or CT will typically display no evidence of mural thickening (Fig. 13).

4.1.4.2\ Differential Diagnosis

Theca lutein cysts may resemble bilateral cystadenomas, but the clinical background is different.