Possibility Of Closure Research Articles

Craniofacial resection for anterior skull base tumours

This study presents a series of 10 patients with anterior skull base tumours, treated by a team of neurosurgeons and head- and neck surgeons. The series included 7 malignant tumours of the nose and paranasal sinuses and 1 retinoblastoma, all with intracranial extension through the lamina cribrosa. There were also 2 patients with an anterior base meningioma, growing into the ethmoid sinus and the nasal cavity. 8 tumours were resected by a combined bifrontal craniotomy and uni- or bilateral rhinotomy. In 2 cases a bifrontal craniotomy alone without facial incision sufficed. The skull base was closed with a pediculated pericranial flap and a split-thickness free skin graft underneath. There were no postoperative problems of wound infection, CSF-leakage or meningitis. Recurrent tumour growth or systemic metastasis occurred in 5 out of 7 patients with malignant tumours, 6 months to 2 years postoperatively. The related literature and especially questions of operative indications and technique, including different possibilities of closure and reconstruction of the skull base, are discussed.

Endoscopic middle meatal antrostomy: theory, technique, and patency.

Ostial obstruction is a major factor in the pathogenesis of sinusitis. Detailed diagnostic evaluation in patients with maxillary sinusitis demonstrates the prominence of disease in the ethmoidal infundibulum and in adjacent ethmoid cells. Surgical procedures performed to improve maxillary sinusitis by inferior meatal antrostomy leave residual disease in the ostiomeatal area and may result in persistent mucociliary obstruction. Historically, the possibility of closure following ostial manipulation and the importance of dependent drainage of the maxillary sinus have been cited as arguments against the middle meatal approach. In this study of middle meatal antrostomies the patency rate was 98% between 4 and 32 months. The postoperative endoscopic findings and symptomatic improvement suggest that mucociliary clearance occurs through the surgically widened ostium. We conclude that endoscopic middle meatal antrostomy does not lead to ostial stenosis.

Patency of the Ductus Arteriosus After Birth: A New Theory

even though in most cases the pressures of the lesser circulation are normal or slightly elevated.8’ #{176} 10 While his interpretation could be applied to the presence of isolated, uncomplicated ductus, there is no stage of normal development which corresponds to the conditions found in ductus with pulmonary hypertension. Kennedy�’ in 1942 stated that “uncomplicated persistent patency of the ductus should not be regarded as malformation, but should be attributed to defective oxygenation of the blood during birth or shortly after.” Several subsequent publications’2’ 13. 14, 1� demonstrated fetal distress at birth and shortly after birth in a great number of the cases of patent ductus which were investigated. In statistical studies performed by Alzamora and co-workers,’5 the occurrence of patent ductus in children born above 9,000 feet is strikingly high. Experimental studies also give’�’ 12 good evidence that asphyxia at birth may delay the closure of the ductus. Undoubtedly, as Record and McKeown’2 state: “these observations . . . do not dispose of the objection that closure might be expected to follow relief of embarrassment unless the possibility of closure is limited to a short period after birth.” It has been shown that the ductus may be obliterated many months after birth, even in the presence of anoxia, like in cases of tetralogy of Fallot,17 but this observation may not have direct bearing on the normal mechanism of closure. Spontaneous closure of the ductus has been described by several observers many months, and even years, after birth.’8’ � 20

Whistle Creek, Park County, Wyoming: ABSTRACT

The Whistle Creek field is located about a mile west of the Garland oil and gas field in the northern Big Horn Basin area, Park County, Wyoming. The discovery well, Seaboard Oil Company's Unit No. 25-16, located in the NE, NW, SW, Sec. 16, T. 56 N., R. 98 W., was completed on November 6, 1951. It found that almost all permeable zones below the Mesaverde, productive elsewhere in the basin, had oil or gas shows; but only the Tensleep and a thin sand in the Morrison gave commercial drill-stem tests. The well was completed in the Tensleep at a total depth of 5,825 with a 30-foot penetration of the producing formation. The initial production was 417 B/D. A second well is currently being drilled to test the madison. The two wells to date have proved an oil column of 52 feet in the Morrison (33 gravity oil) and 184 feet in the Tensleep (28 gravity oil). The Tensleep sand section is 143 feet thick with about 100 feet effective. Detailed mapping in the outcropping beds of the Upper Cretaceous age suggested the possibility of closure on the west flank of the Garland anticline. The subsurface was detailed by seismograph prior to drilling. Two new locations have been made; one a normal 40 acre stepout due south of the discovery well and the other of wildcat class about 3½ miles southeast in NE, SE, SW, Sec. 35, T. 56 N., R. 98 W. The Whistle Creek feature is unitized with 5,360 acres included in the unit. The interests are: Seaboard Oil Company, 72%, C. H. Murphy, 24%, Amerada Oil Corporation, 4%. Seaboard Oil Company is the operator. End_of_Article - Last_Page 967------------