Ryuichiro Yano

Anatomic variation of the celiac trunk with special reference to hepatic artery patterns

Based on a large homogeneous sample from a Japanese population, anatomic variations in the celiac trunk (CT) and the hepatic artery were studied. Previously we analyzed the branching mode of the CT in 450 Japanese cadavers. In order to maximize the database on the CT and hepatic artery, we examined the anatomy of these arteries in 524 cadavers, a total of 974 cases. A total of 89.8% of cases showed the classical trifurcation of the CT. The typical normal pattern of the CT and the hepatic artery was confirmed in 66.6% and 72.4% of the cadavers, respectively. Variant left and right hepatic arteries were observed in 11.0% and 4.9%, respectively. A variant anatomy involving both the left and right hepatic arteries was found in 1.5%. A common hepatosplenic trunk and a gastrohepatic trunk were seen in 4.4% and 0.3%, respectively. A common hepatic artery (CHA) arising from the superior mesenteric artery (SMA) or directly from the aorta was present in 3.5% or 0.5%, respectively. A hepatosplenomesenteric trunk and a celiomesenteric trunk were encountered in 0.7%, respectively. This anatomical update of the CT and the hepatic artery can be useful for transplantation and general surgeons, as well as vascular radiologists in this area.

Exploratory study of pre‐surgical medications with dienogest or leuprorelin in laparoscopic cystectomy of endometrial cysts

The aim of this study was to compare the effects of pre‐surgical medication with dienogest or leuprorelin on post‐surgical ovarian function.

Ovarian fibromas: MR imaging findings with emphasis on intratumoral cyst formation

PURPOSE The purpose of this study was to assess MR imaging findings of ovarian fibromas with emphasis on intratumoral cyst formation. MATERIALS AND METHODS MR images with a 1.5-T unit obtained in 17 consecutive patients (age range, 18-87 years; mean age, 58 years) with 17 histologically proven ovarian fibromas were retrospectively reviewed for the size, configuration, signal intensity of solid components, and presence of cystic degeneration and edema within tumor. Size, number, and location of intratumoral cysts were also assessed. RESULTS The maximum diameter of tumors ranged from 3.3 to 19.1cm (mean, 10.9 cm). Seven (41%) tumors were multinodular. On T2-weighted images, solid components of tumors were heterogeneously mixed hypo- and hyperintensity in 16 (94%) tumors. Nine (53%) tumors demonstrated cysts and 16 (94%) demonstrated edema within tumor. The maximum diameter of the largest cysts ranged from 1.0 to 13.2 cm (mean, 6.4 cm), and the number of cysts per tumor ranged from 1 to 60 (mean, 15.6). Of the nine tumors with cystic formation, the predominant location of the cysts was peripheral in five (56%), exophytic in two (22%), central (11%) in one, and diffuse in one (11%). CONCLUSION Peripheral or exophytic cyst formation may be characteristic MR imaging features with ovarian fibromas.

Occurrence of the parathyroid cyst in golden hamsters.

Parathyroid cyst is a rare lesion, but has clinical significance because of its ability to mimic a thyroid mass and its association with hyperparathyroidism. The occurrence and morphology of parathyroid cysts in golden hamsters from neonatal to senile periods were investigated using light and electron microscopy. The results demonstrate the presence of chief cell cysts in the parathyroid glands of 5-day-old hamsters. Some chief cells lining the cyst wall showed mitosis and apoptosis. The existence of chief cell cysts may represent the rapid proliferation of the parathyroid chief cells in 5-day-old hamsters. Ciliated cysts were observed in the parathyroid glands of 5-day-, 1- and 3-month-old hamsters. Three cell types were distinguished in the wall of the ciliated cyst: Ciliated, mucous and basal cells. Ciliated cysts possessed the features of the pharyngeal epithelia without endocrine cells and may arise from embryological remnants of pharyngeal pouches in the neck undergoing cystic degeneration and entrapping portions of parathyroid tissue. The frequency of parathyroid cysts decreased with age.

Androgenic adult granulosa cell tumor with secondary amenorrhea and elevated luteinizing hormone

Abstract Granulosa cell tumors (GCTs), adult type, are the most common type of ovarian sex cord tumors. Menstrual irregularity, even secondary amenorrhea is frequently observed in premenopausal women bearing GCTs with hormonal activity.

A case of benign cystic mesothelioma arising from the lesser omentum in a 13-year-old girl treated through a laparoscope excision

Abstract Benign cystic mesotheliomas (BCMs) are extremely rare tumors usually occurring in females of reproductive age. A 13-year-old Japanese girl presented with abdominal pain, and an adnexal cystic tumor was suggested by images. At