[en] The ranges in which the normal structures in the pelvis located and were visualized by transaxial computed tomography were measured in 94 normal females. (Chiba, N.)

[en] Various imaging methods of endometrial cancer were evaluated. Transabdominal ultrasound tomography, intracavitary radial scanning ultrasound tomography, CT and gallium-67 scintigraphy were reviewed, and their clinical usefulness was described. (Chiba, N.)

[en] With the progress in diagnostic imaging techniques, the preoperative diagnostic technique for lesion in the pelvic cavity has become comparatively easy and its clinical usefulness is in high estimation. However, in case of an atypical lesion, it is not always easy to recognize the original organ by traditional imaging pattern. In the present report two cases of colossal hematometra in old women which presented a cystic lesion pattern are dealt with and discussed from a point of medical imagings for diagnosis. (author)

[en] Being a semi-fixed organ, the normal uterus showed variable shapes on CT, but generally, demonstrated a single solid pattern with a smooth margin, in continuation to the vaginal portion. The vaginal portion was visualized as a solid form localized in the cavity, and the uterine cervix and body appeared in series. The uterus usually emerged at 2 - 3 cm above the pubis, and the uterine base was revealed by the distance of 9 cm. By non-contrast enhancement, CT values were 40 - 55 Hounsfield unit (HU) at an almost iso-density with the surrounding organs. By 10 minute drip infusion (most desirable in view of duration) of 100 ml of 65% angiografin, CT values increased in correlation with the blood concentration of the drug, showing a peak of over 100 HU. The rate of this increase was low in other organs. CT values of the greatest gluteal muscle visualized at each level of inrapelvic CT were 40 - 60 HU by means of pre-contrast and less than 80 HU in the maximum of post-contrast. The ileopsoas muscle showed similar values. (Chiba, N.)

[en] To improve diagnostic accuracy of radionuclide examinations in malignant tumors of gynecological region, various pre-treatments carried out before ⁶⁷Ga-scintigraphy were discussed, and usefulness of ⁶⁷Ga-citrate was also discussed. Prior to ⁶⁷Ga-scintigraphy, contents of the intestine were excreted thoroughly, complete urination was done, and 200 ml of saline solution was injected into the bladder cavity. Then, a tandem used for intracavitary irradiation was inserted into the uterine cavity and the rectal cavity. When ⁶⁷Ga-scintigraphy was carried out, a vinyl tube of which point was applied with a small amount of sup(99m)Tc was passed through the tandem in order to mark positively the fundus of the uterine cavity, the external uterine cavity, and the rectum. Radioisotopic markers on the skin were placed on bilateral anterior superior and inferior iliac spines, promontrium or upper margin of the tumor. By these pre-treatments, the configuration of the pelvic cavity was obtained precisely, backgrounds within the pelvic cavity decreased, and ⁶⁷Ga accumulation in the pelvic cavity could be discussed from the uterine axis. Therefore, the image analysis became easy. (Tsunoda, M.)

[en] Ultrasonotography (USG) and CT were applied to diagnose the pelvic diseases and the images from them were compared and studied. USG should be performed before CT because of their easiness and non-invasiveness. There are many differences in the quality of the informations from images of USG and CT. When USG is used together with CT, one compensates with the disadvantage of the other. More accurate diagnoses of the pelvic disease can be provided by using USG together with CT and applied to the treatment. (Nishio, M.)

[en] RI scintigrams are useful in the diagnosis of intrauterine abnormalities during pregnancy, including placenta previa, placenta lobita, placental apoplexy, hydatidiform mole, etc. The usefulness of combined ultrasonography and RI scintigraphy in the diagnosis of placenta previa was determined. RI scintigraphy compensated for the disadvantages of ultrasonography and made a more accurate diagnosis possible. In the future, it will be possible to make an even more accurate diagnosis by the application of new RI, more efficient detectors, and the combined use of RI scintigraphy and ultrasonography. (Nishio, M.)

[en] In the diagnostic imaging of female pelvic lesions, the recognition of the uterus is considered to be an essential step for analyzing the image. Ultrasonically, the presence of uterus can be confirmed by echo pattern and level of intensity, and in CT, by the pattern and density. In both modalities, the uterine image is widely accepted as smoothly outlined solid mass Nevertheless, pathological findings show a wide range of variety in the image. With some obstructive cause of cervical canal, uterine body is displayed to be cystic, that is ''cystic uterus''. The cystic uterus, especially associated with neoplasma, must be differentiated from other cystic lesions. In such cystic uterus, the following images in CT and US can usually be observed: (1) close-up of tumor with vagina, (2) positional relationship of tumor with pelvic structures, especially ureters, (3) characteristic shape-smoothly outlined, gourd-shaped cystic lesion, (4) homogeneously thick, ''high density'' mass wall. (5) Partial projection of mass wall into cavity, so called ''cervical sign'', (6) nature of accumulated fluid containing the necrotic debris, suggesting the endometrial neoplastic change, and (7) rule out the other solid mass from pelvic cavity. (author)