No abstract available.
Leriche Syndrome*

Since the renal epidermoid cyst is too rare, the mechanisms of squamous morphogenesis have not well characterized. A 73-year-old female was referred with an incidentally detected renal pelvis mass. Abdominopelvic computed tomography scan revealed a noncalcified soft tissue mass in the renal pelvis. Total nephroureterectomy was performed under the impression of a renal pelvis malignancy. The patient was discharged without postoperative complication. The outer surface of mass lesion was lined with urothelia and squamous epithelia, containing keratinous materials. The urothelia were positively stained against uroplakin II and cytokeratin 7, whereas almost of the squamous epithelia were negative with uroplakin II. The two different epithelia were generally sharply demarcated. Interestingly, some part of squamous epithelia contained uroplakin-positive and many more cytokeratin 7-positive cells. The atypical clinical features in our case can reconsider the diagnostic clues of renal epidermoid cysts that have been reported before, and the unique immunohistochemical results may understand the histogenetic implications of the lesion.
Epidermal Cyst ; Female ; Humans ; Keratin-7 ; Keratins ; Kidney ; Kidney Pelvis ; Morphogenesis ; Postoperative Complications ; Uroplakin II ; Uroplakins

Pigmented(melanotic) schwannoma is a very rare variant of schwannoma that characteristically has massive cytoplasmic melanin. Since it was described in 1946 by Bjorneboe, about 44 cases have been reported in the English literature. It has a relatively benign clinical course, but the cases arising in the cranial nerve and sympathetic chain show aggressive behavior with malignant potential. We herein report a typical case of pigmented schwannoma with light microscopic findings. The results of immunohistochemical and electronmicroscopic study are also presented. The patient was a 30 year-old Korean male who had a mass in his posterior neck for 10 years that recently.began to induce neurologic manifestations. The tumor, which was mainly in the extramedullary intradural space of the cervical canal extending to the extradural space and soft tissues of the neck, was relatively well defined and composed of black solid tissue. Microscopic, densely pigmented spindle cells forming fascicles, nuclear palisading, whorling and polygonal cells with vacuolated or clear cytoplasm were characteristic. Immunohistochemically, the tumor cells were positive for vimentin, S-100 protein, and HMB-45. Electron microscopic study revealed that the tumor cells have interdigitating cytoplasmic processes containing varying stages of melanosomes with a very focal basal lamina and Luse body like collagen bundles.
Male ; Humans

No abstract available.
Sympathectomy

BACKGROUND: Several investigations have studied hypoxic pulmonary vasoconstriction (HPV) during endotoxemia and there is an increase in nitric oxide (NO) in pulmonary vessels. However, these studies yielded conflicting or at times contradictory results, since reference has been made to both enhancement and inhibition of HPV. Our objective was to determine the changes of hypoxic pulmonary vasoconstriction on the isolated blood-perfused lung of endotoxemic rats. METHODS: Pulmonary arterial pressure (PAP) was measured in a blood-perfused lung preparation from Sprague-Dawley rats in normoxia (21% O2, 5% CO2, balanced N2) and hypoxia (5% O2, 5% CO2, balanced N2). We studied the effect of normoxia and hypoxia in a control group, Escherichia coli lipopolysaccharide group (LPS) and LPS with N omega-nitro-L-arginine methyl ester group (L-NAME). RESULTS: The Baseline PAP was higher in LPS (15.0+/-4.0 mmHg) compared with control group (10.9+/-2.9 mmHg) and L-NAME (11.1+/-3.6 mmHg). In hypoxia, HPV was higher in L-NAME (109.6+/-100.2%) compared with control group (59.9+/-31.6%) and LPS (58.8+/-33.8%)(P<0.05). CONCLUSIONS: We conclude that NO is an important factor to impair HPV during endotoxemia.
Animals ; Anoxia ; Arterial Pressure ; Endotoxemia ; Escherichia coli ; Lung* ; NG-Nitroarginine Methyl Ester ; Nitric Oxide ; Rats* ; Rats, Sprague-Dawley ; Vasoconstriction*