NATROLEMOYNITE, A NEW HYDRATED SODIUM ZIRCONOSILICATE FROM MONT SAINT-HILAIRE, QUEBEC: DESCRIPTION AND STRUCTURE DETERMINATION

Correlation between radiologic feature and spread through air space in lung solid adenocarcinoma 30.0mm or less in maximum diameter.

Single dose radiosurgical treatment of recurrent previously irradiated primary brain tumors and brain metastases: final report of RTOG protocol 90-05

Two hundred and fifty consecutive patients with suspected appendicitis were examined with graded compression sonography. The initial diagnostic criterion for appendicitis was visualization of a noncompressible appendix; this was later modified to include the dimensions of the visualized appendix. The appendix was visualized in 91 of 250 patients (36%). Five adult patients with sonographically visible appendixes that were 6 mm or less in maximal diameter had either benign clinical follow-up (three patients) or a histologically normal appendix removed at surgery (two patients). However, two patients with appendixes measuring 6 mm in diameter and multiple appendicoliths had surgically confirmed acute appendicitis. Of 84 patients with visible appendixes measuring greater than 6 mm in maximal diameter, 78 had surgically confirmed acute appendicitis. In the remaining six, symptoms resolved spontaneously, and no surgery was required. In the absence of compelling clinical findings or an appendicolith, adult patients with maximal appendiceal diameters of 6 mm or less should undergo a period of close observation rather than immediate surgery. A diagnosis of appendicitis can be made in adult patients with persistent right lower quadrant pain and a visualized appendix greater than 6 mm in diameter.

Other| December 01, 1997 Lukechangite-(Ce), a new rare-earth-fluorocarbonate mineral from Mont Saint-Hilaire, Quebec Joel D. Grice; Joel D. Grice Canadian Museum of Nature, Research Division, Ottawa, ON, Canada Search for other works by this author on: GSW Google Scholar George Y. Chao George Y. Chao Carleton University, Canada Search for other works by this author on: GSW Google Scholar American Mineralogist (1997) 82 (11-12): 1255–1260. https://doi.org/10.2138/am-1997-11-1220 Article history first online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation Joel D. Grice, George Y. Chao; Lukechangite-(Ce), a new rare-earth-fluorocarbonate mineral from Mont Saint-Hilaire, Quebec. American Mineralogist 1997;; 82 (11-12): 1255–1260. doi: https://doi.org/10.2138/am-1997-11-1220 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu nav search search input Search input auto suggest search filter All ContentBy SocietyAmerican Mineralogist Search Advanced Search Abstract Lukechangite-(Ce), ideally Na3Ce2(CO3)4F, is a new mineral from Mont Saint-Hilaire, Quebec. It occurs as tabular, short prismatic, and barrel-shaped crystals up to 1 mm. It is colorless to pale beige with a white streak and a vitreous, or somewhat pearly on {0001}, luster. Associated minerals include microcline, analcime, sodalite, aegirine, serandite, eudialyte, catapleiite, fluorite, petersenite-(Ce), siderite, astrophyllite, and albite. Lukechangite-(Ce) is soft, Mohs hardness ≈ 4½, brittle, with an uneven to conchoidal fracture, and with perfect {0001} cleavage. Lukechangite-(Ce) is uniaxial negative, ω = 1.728(3) and ϵ = 1.542(1). It is hexagonal, space group P63/mmc, a = 5.068(1), c = 22.87(5) Å, V = 509(1) Å3, and Z = 2. The strongest X-ray powder diffraction lines [d (Å), I, hkl] are: 5.71(50)(004), 4.31(100)(101), 3.804(50)(006), 3.169(70)(105), 2.877(60)(106), 2.534(70)(110), 2.192(90B)(109,200,201), 1.978(70)(205), and 1.658(50)(209,210,211). An average of the electron-microprobe analyses gave Na2O 14.94, CaO 0.10, SrO 0.12, La2O3 16.36, Ce2O3 29.48, Pr2O3 1.95, Nd2O3 5.88, F 3.58, CO2 (28.40), and O ≡ F – 1.51, total 99.30 wt%. CO2 was calculated by stoichiometry from the results of the crystal-structure analysis. Dcalc is 4.02 g/cm3. The atomic arrangement of lukechangite-(Ce) has been refined to R = 3.4%. The structure is layered parallel to (001), with CO3 groups oriented parallel to the layering forming thick slabs incorporating either Ce or Na cations and a separate Na-F layer. The structure of lukechangite-(Ce) resembles that of huanghoite-(Ce) and baiyuneboite-(Ce) and is isostructural with synthetic Na3La2(CO3)4F. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not currently have access to this article.

Objective To assess the feasibility and safety of endovascular treatment of ruptured very small intracranial aneurysms with relatively wide - neck( defined as ≤3 mm in maximum aneurysmal diameter and ≥3/4 in neck -to - dome ratio).Method Twenty-seven ruptured very small intracranial aneurysms with relatively wide necks were treated by endovascular procedures between Jan. 2002 and Oct 2009. Their clinical, angiographic, intervention and follow -up data were reviewed in this study. Results The mean age of 24 patients (9 males and 15 females) was 56. 3 years (range 27～83 years ) , and the Hunt - Hess grade was Grade I ～II in 16 patients and Grade M ~ IV in 8. All of the 27 aneurysms were not more than 3 mm in maximum diameter and not less than 3/4 in neck - to - dome ratio. The locations of 27 aneurysms were PCoA(7 aneurysms) ,AcoA(8) ,ICA(6) ,MCA(3) ,AChA( 1) ,pericallosal artery( 1) and VA( 1). Twenty - four of the 27 aneurysms were successfully occluded with 1 to 3 coils respectively and the total length of coil(s) packed in each aneurysm varied from 10 to 100 mm (mean 34.4 mm) .whereas the remaining 3 aneurysms were treated by sole stent deployment in the parent artery. Of the 24 coiled aneurysms, the occlusion rate was 100% in 4 aneurysms,90% in 13,80% in 6 and less than 80% in 1. Procedural complications occurred in 2 patients, both resulting in transient mild hemiparesis. All patients were clinically followed up for a mean time of 51 months (range 1-94 months) ,and there was no rebleeding. Angiographic follow - up of 7 aneurysms in 6 patients was performed at 6 - 38 months after the procedures, which demonstrated no evidence of aneurysmal re - growth. Conclusions For ruptured very small aneurysms with relatively wide - necks, endovascular therapy with coil embolization or stent placement in parent artery is technically feasible,relatively safe and seems to be effective in preventing rebleeding. Key words: Very small aneurysm; Relatively wide-necked; Endovascular treatment

Pre-surgical assessment of mediastinal lymph node metastases in patients having ≥ 30 mm non-small-cell lung cancers

Ferrokentbrooksite, ideally Na 15 Ca 6 (Fe,Mn) 3 Zr 3 NbSi 25 O 73 (O,OH,H 2 O) 3 (Cl,F,OH) 2 , is a new member of the eudialyte group from Mont Saint-Hilaire, Quebec; it is the ferrous-iron-dominant analogue of kentbrooksite. It occurs as reddish brown to red, pseudo-octahedral crystals to 1 cm in diameter. Associated minerals include microcline, nepheline (partially altered to natrolite), fluorite, fluorapatite, natrolite, gonnardite, rhodochrosite, aegirine, albite, calcite, serandite, ancylite-(Ce), and catapleiite. It is transparent with a vitreous luster and a white streak. It is brittle, with a hardness of 5–6 (Mohs scale). It has no cleavage, no parting, and an uneven to conchoidal fracture. It is uniaxial negative with ω 1.6221(3) and e 1.6186(3). It is trigonal, space group R 3 m , a 14.2099(7) and c 30.067(2) A, V 5257.7(3) A 3 , Z = 3. The strongest nine X-ray powder-diffraction lines [ d in A( I )( hkl )] are: 7.104(38)(110), 5.694(50)(202), 4.300(43)(205), 3.955(31)(214), 3.391(51)(131), 3.207(31)(208), 3.155(31)(217), 2.968(100)(315) and 2.847(98)(404). The infrared spectrum of ferrokentbrooksite is given. An average result of two electron-microprobe analyses of the grain on which the structure was refined gave Na 2 O 11.96, K 2 O 0.44, CaO 7.99, MnO 3.88, FeO 5.08, SrO 0.45, Al 2 O 3 0.11, Y 2 O 3 0.58, La 2 O 3 1.51, Ce 2 O 3 2.51, Nd 2 O 3 0.53, Sm 2 O 3 0.11, Gd 2 O 3 0.17, SiO 2 44.70, TiO 2 0.09, ZrO 2 11.20, HfO 2 0.17, Nb 2 O 5 2.51, Ta 2 O 5 0.16, F 0.40, Cl 0.93, H 2 O 0.35, O ≡ F, Cl –0.38, for a total of 95.45 wt.%. The amount of H 2 O was calculated by stoichiometry from the crystal-structure analysis. The empirical formula of ferrokentbrooksite, based on 77.47 anions as determined in the crystal-structure analysis, is: (Na 13.05 REE 0.99 K 0.32 Ca 0.23 Sr 0.15 ) ∑14.74 (Ca 4.59 Mn 1.24 Y 0.17 ) ∑6 (Fe 2.39 Mn 0.61 ) ∑3 (Zr 3.00 Ti 0.04 Hf 0.03 ) ∑3.07 (Nb 0.64 Si 0.23 Zr 0.07 Ta 0.02 ) ∑0.96 (Si 24.93 Al 0.07 ) ∑25 O 73 (O,OH,H 2 O) ∑2.47 (Cl 0.89 F 0.71 OH 0.40 ) ∑2 ; D meas = 3.06(3) g/cm 3 , D calc = 3.06 g/cm 3 . Ferrokentbrooksite possesses the eudialyte structure, and has Fe as the predominant element at M (2) replacing Mn. Fe is predominantly five-fold coordinated, and bond-valence calculations indicate it to be divalent.

Clinical guidelines for the early detection of plantar malignant melanoma

Small-diameter malignant melanoma: A common diagnosis in New South Wales, Australia

Background : The ABCDE guide developed at the New York University Medical Center and Harvard Medical School has proved useful in the detection of early malignant melanomas. This guide stipulates that melanomas usually are more than 6 mm in maximal diameter and are elevated. Objective : Our purpose was to determine whether these size criteria applied in Australia. Methods : The records of 1150 melanoma patients at the Sydney Melanoma Unit between June 1989 and September 1991 were reviewed. Results : Almost one third of the 1150 melanomas (358) were 6 mm or less in maximal diameter, and the median thickness of these 358 melanomas was 0.8 mm. Conclusion : The ABCDE guide to the signs of early melanoma may have to be modified to include smaller diameter, clinically impalpable melanomas. There appears to be a close correlation between patient age at diagnosis and both lesion diameter and thickness. Because increases in diameter occurred more rapidly than increases in thickness, subtle increases in lesion diameter may provide a better clue to earlier diagnosis.

Objective To evaluate efficacy in detecting lung nodules at low-dose CT (LDCT) by nodule enhanced viewing (NEV). Methods One hundred and twenty seven patients who were referred to undergo low-dose CT (LDCT) for the evaluation of pulmonary metastasis or screening lung cancer were selected randomly.Two radiologists with at least 10 years experience read the images with normal clinical reading speed to find actionable nodules≤2.0 cm in maximum diameter,and their consensus result was referred as“Standard”.NEV was adopted to detect the pulmonary nodules.Two residents with experience of less than three years read first detected suspicious nodules and recorded reading time,first consensus and mean time were recorded.Then,they made second decisions on the images with the help of NEV and the results and the reading time were recorded and analyzed by using wilcoxon test.The sensitivity and accuracy of NEV,residents and residents with NEV were analyzed. Results “Standard”,resident,NEV and resident with NEV detected 570,404,768 and 593 lung nodules≤2.0 cm in maximum diameter,respectively.More than 60% nodules were less than 0.5 cm in maximum diameter.The performance of NEV in detecting nodules≤2.0 cm as well as nodules <0.5 cm in maximum diameter was significantly higher than that of the resident (Z=-6.887,P<0.01 andZ=-7.235,P<0.01),and the performance of resident with NEV in detecting nodules≤2.0 cm as well as nodules<0.5 cm in maximum diameter was significantly higher than that of resident without NEV (Z=-6.606,P<0.01 andZ=-6.657,P<0.01).The resident,NEV and the resident with NEV detected nodules<20 mm in maximum diameter with sensitivities of 61.4%,86.3% and 95.3%,and with accuracy of 56.1%,58.1% and 87.6%,respectively.The resident achieved sensitivities of 51.4%,88.1% and 94.8%,and accuracy of 47.0%,56.9% and 87.5% for nodules<5mm in maximum diameter,respectively.The resident,NEV and resident with NEV spent 120-444 s,85-262 s and 131-1512 s per case to read the CT scans,respectively.The reading time of resident with NEV in was significantly higher than that of resident without NEV (Z=-9.781,P<0.01).The resident spent 23 s per NEV mark. Conclusion NEV considerable improves the resident' s performance in lung nodule detection,especially in maximum diameter<0.5 cm nodule detection. Key words: Multiple pulmonary nodules; Diagnosis techniques,respiratory system

Risk of Rupture and All Cause Mortality of Abdominal Aortic Ectasia: A Systematic Review and Meta-Analysis

In patients with squamous cell carcinoma of the esophagus, the preoperative clinical staging of the N category is primarily based on the lymph node size. Lymph nodes > 10 mm are considered to be tumor-infiltrated. This histopathologic study investigated the correlation of lymph node size and metastatic infiltration in esophageal carcinoma of patients with and without neoadjuvant radiochemotherapy. The specimens of 40 patients with squamous cell carcinoma of the esophagus were included in a prospective morphometric study. Half of these patients (n = 20) received preoperative radiochemotherapy. The number of resected lymph nodes were counted, and the largest diameter of each node was measured. Metastatic involvement of each node was analyzed by histologic examination. The frequency of lymph node metastases was calculated and correlated to the lymph node size. A total of 1196 lymph nodes with an average of 29.9 nodes per patient were resected and analyzed; 129 lymph nodes (10.8%) showed metastatic infiltration. The average size of 1067 tumor-free lymph nodes was 5.1 +/- 3.8 mm in maximum diameter, whereas the average size of 129 metastatic lymph nodes was 6.7 +/- 4.2 mm (p = 0.00006). Of all resected lymph nodes, 761 (63.6%) were < or = 5 mm in maximum diameter. Only 9.3% (n = 111) of all resected lymph nodes were > 10 mm in maximum diameter. There was no significant correlation between lymph node size and the frequency of nodal metastases. No difference in size could be demonstrated between patients with and without neoadjuvant radiochemotherapy. Diagnostic imaging techniques using size as the criterion of nodal infiltration cannot exactly assess the nodal status of patients with esophageal carcinoma. This is also true for patients after neoadjuvant radiochemotherapy. Therefore, evaluation of the nodal status in patients with squamous cell carcinoma of the esophagus is entirely based on pathohistologic analysis after a well defined lymphadenectomy.

Adamsite-(Y), ideally NaY(CO3)2•6H2O, is a newly identified mineral from the Poudrette quarry, Mont Saint-Hilaire, Quebec. It occurs as groups of colorless to white and pale pink, rarely pale purple, flat, acicular to fibrous crystals. These crystals are up to 2.5 cm in length and form spherical radiating aggregates. Associated minerals include aegirine, albite, analcime, ancylite-( Ce), calcite, catapleiite, dawsonite, donnayite-(Y), elpidite, epididymite, eudialyte, eudidymite, fluorite, franconite, gaidonnayit e, galena, genthelvite, gmelinite, gonnardite, horvathite-(Y), kupletskite, leifite, microcline, molybdenite, narsarsukite, natrol ite, nenadkevichite, petersenite-(Ce), polylithionite, pyrochlore, quartz, rhodochrosite, rutile, sabinaite, serandite, siderite, sp halerite, thomasclarkite-(Y), zircon and an unidentified Na– REE carbonate (UK 91). The transparent to translucent mineral has a vitreous to pearly luster and a white streak. It is soft (Mohs hardness 3) and brittle with perfect {001} and good {100} and {010} cleav ages. Adamsite-(Y) is biaxial positive, � = 1.480(4), � = 1.498(2), � = 1.571(4), 2Vmeas. = 53(3)°, 2Vcalc. = 55° and is nonpleochroic.

Rogermitchellite is a new, complex species of zirconosilicate found in igneous breccia at the Poudrette quarry, Mont Saint-Hilaire, Quebec. It is associated with aegirine, annite, galena, a labuntsovite-group mineral, manganoneptunite, microcline, pyrrhotite, sodalite and zircon. Paragenetically, the mineral crystallizes after aegirine and before microcline. Isolated, single crystals are colorless to grey, prismatic along [001], and slightly flattened perpendicular to this direction, with a maximum dimension of 0.1 × 0.25 mm. It develops as euhedral crystals displaying the prominent forms prism {100} and pinacoid {001}, with a minor, very shallow ditrigonal scalenohedron {10 l }. The mineral is transparent with a vitreous luster and a white streak and is non-luminescent. The Mohs hardness is 5, and no cleavage is evident. It is brittle with a conchoidal to splintery fracture. The calculated density is 3.34 g/cm 3 . Rogermitchellite is non-pleochroic, uniaxial positive, with ω 1.640(1) and e 1.663(1). Four analyses made on one crystal gave, as an average: Na 2 O 3.45, CaO 0.10, SrO 18.54, BaO 5.18, B 2 O 3 (calc.) 2.34, SiO 2 39.12, ZrO 2 26.39, TiO 2 0.63 and H 2 O (calc.) 6.96, for a total of 102.71 wt.%. The empirical formula, based on 288 anions and the sum of (Si + B) = 90 apfu , is: Na 12 (Sr 21.16 Na 1.17 Ca 0.21 ) ∑22.54 Ba 4.00 (Zr 25.33 Ti 0.93 ) ∑26.26 (Si 77.02 B 0.98 ) ∑78 B 12 O 246 (OH) 24 ·18H 2 O or, ideally, Na 12 Sr 24 Ba 4 Zr 26 Si 78 B 12 O 246 (OH) 24 ·18H 2 O. The mineral is trigonal, space group P 3 c 1, a 26.509(4), c 9.975(2) A, V 6070.6(1) A 3 and Z = 1. The strongest six lines on the X-ray powder-diffraction pattern [ d in A(I)( hkl )] are: 2.760(100)(442), 3.761(90)(402), 1.991(70)(444), 3.150(50)(441), 5.762(40)(400) and 3.924(30)(312). The crystal structure was refined to R = 4.62% and w R 2 = 12.73% for 1588 reflections [ F o > 4σ( F o )]. It consists of pairs (Si 3 O 9 ) rings (offset 30° relative to one another along [001]) linked to isolated ZrO 6 octahedra in a motif similar to that in benitoite. Additional (Si 3 O 9 ) and [Si 2 BO 7 (OH) 2 ] rings along with ZrO 6 octahedra complete a three-dimensional heteropolyhedral framework. Channels along [001] within this framework are occupied by Ba, Na, (Sr + Na) and H 2 O. Rogermitchellite has chemical and crystal-structure features common to benitoite, wadeite and catapleiite, and should be considered as a structural hybrid of these minerals. It possesses additional features (presence of essential B, Sr, H 2 O; trigonal symmetry) that make it unique.