By Martin C. Powell
Offers the functions of MRI in obstetrics and gynaecology in a close, but sensible method
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Extra resources for Magnetic Resonance Imaging in Obstetrics and Gynaecology
On a Tx/T2-weighted image the tumour is difficult to differentiate from the myometrium and endometrium; its true extent is not apparent. If the T2 weighting is lengthened the signal from the tumour relative to the surrounding tissues increases, becoming more distinct. A pseudocapsule can be seen around the tumour, which has been 48 Magnetic Resonance Imaging in Obstetrics and Gynaecology (a) (b) (c) (d) Fig. 1 Sagittal view. Stage IB carcinoma of the cervix, (a) Γ,-weighted (TR 320 ms TE 40 ms); (b) r,/r2-weighted (TR 1000 ms TE 40 ms); (c) 72-weighted (TR 2000 ms TE 80 ms); (d) STIR (TR 1500 ms TI 100 ms).
1990). The accuracy rates of these modalities for parametrial evaluation were 78% for clinical evaluation, 70% for CT and 92% from MRI. Similar results have come from other centres (Sironi et al, 1990; Lien et al, 1991). The impact of these studies is lessened by the relatively small numbers of patients involved in the trials; in particular there are few patients with stage III and IV disease. Such selection bias is not surprising, as it may be difficult to persuade patients with advanced disease to undergo additional radiological examinations.
This has metastasised to the surrounding lymph nodes, which have been completely replaced by the high signal from the adenocarcinoma tissue. Some of the nodes are less than 10 mm in diameter and their involvement would not have been detected by CT. 16). There is an enlarged group of nodes around the bifurcation of the common iliac vessels, displacing the psoas muscle. The nodes again possess the characteristic high signal intensity associated with uterine carcinomas. This particular patient had presented with some mild abdominal discomfort, but was otherwise well, with no mass to be palpated on clinical examination.
Magnetic Resonance Imaging in Obstetrics and Gynaecology by Martin C. Powell