The Experts below are selected from a list of 183 Experts worldwide ranked by ideXlab platform
Hirohiko Kakizaki - One of the best experts on this subject based on the ideXlab platform.
-
comparison of bony Nasolacrimal Canal narrowing with or without primary acquired Nasolacrimal duct obstruction in a japanese population
Ophthalmic Plastic and Reconstructive Surgery, 2014Co-Authors: Yasuhiro Takahashi, Kouhei Nakata, Hidetaka Miyazaki, Akihiro Ichinose, Hirohiko KakizakiAbstract:Purpose: To compare the minimum diameter of the Nasolacrimal Canal and its location between patients with or without primary acquired Nasolacrimal duct obstruction (NLDO) in a Japanese population. Methods: One hundred one patients with unilateral primary acquired NLDO (Group A, 101 affected sides; Group B, 101 unaffected sides) and 50 non-NLDO patients (Group C, 100 sides) were included. Anteroposterior and transverse diameters were measured at the Canal entrance and the shortest point using contiguous 1-mm axial computed tomographic images. Canal shapes were classified into 2 types: the “funnel” type (a Canal with both minimum diameters at the Canal entrance) and the “hourglass” type (a Canal with at least one minimum diameter in the Canal). The distance from the entrance to the part with the shortest diameter was measured on sides with the hourglass type. Results: The funnel type was found more frequently in Groups A and B than in Group C (p 0.050). Conclusions: Primary acquired NLDO patients exhibited the funnel type more frequently or there was a shorter distance from the entrance to the part with the shortest diameter than non-NLDO patients, which may enhance the risk of primary acquired NLDO.
-
consecutive microscopic anatomical characteristics of the lacrimal sac and Nasolacrimal duct cases with or without inflammation
Investigative Ophthalmology & Visual Science, 2014Co-Authors: Hidenori Mito, Yasuhiro Takahashi, Takashi Nakano, Ken Asamoto, Hiroshi Ikeda, Hirohiko KakizakiAbstract:PURPOSE We examined the consecutive microscopic anatomy of the lacrimal sac and Nasolacrimal duct with or without conspicuous inflammation. METHODS We used 18 postmortem lacrimal sacs and Nasolacrimal ducts of 12 Japanese subjects (5 males, 7 females, aged 75-98 years at death). The removed mucosal wall was transversely sectioned. The first slice was cut around the internal Canalicular punctum, the second slice was at the superior opening of the bony Nasolacrimal Canal, and the other four were harvested from the Nasolacrimal duct. All specimens were dehydrated and embedded in paraffin, cut into 7-μm thick sections, and stained with Masson's trichrome. RESULTS The lumen was larger in the lacrimal sac than in the Nasolacrimal duct. The lacrimal sac wall was less developed than the Nasolacrimal duct wall. All specimens but two showed a narrowed area in the Nasolacrimal duct. Specimens without conspicuous inflammation showed some subepithelial inflammatory cell infiltration. Goblet cells were smaller in number in the lacrimal sac with an increasing tendency in the inferior direction. Specimens with conspicuous inflammation showed narrowed portions in the Nasolacrimal duct, in which severe inflammation and exudate in the lumen was observed. The epithelium was denuded and goblet cells were lost. A specimen with focal inflammation illustrated similar findings in the inflammatory part, but the other parts were similar to the specimens without inflammation. CONCLUSIONS Consecutive microscopic anatomical characteristics of the lacrimal sac and Nasolacrimal duct were different from each other. A narrowed part of the Nasolacrimal duct lumen is speculated to be a risk for obstruction.
-
the narrowest part of the bony Nasolacrimal Canal an anatomical study
Ophthalmic Plastic and Reconstructive Surgery, 2013Co-Authors: Yasuhiro Takahashi, Takashi Nakano, Ken Asamoto, Masayoshi Iwaki, Dinesh Selva, Igal Leibovitch, Yasuhisa Nakamura, Hirohiko KakizakiAbstract:Purpose To determine the narrowest diameter of the bony Nasolacrimal Canal. Methods Fifty-eight bony Nasolacrimal Canals from 29 Japanese cadavers (12 men and 17 women; average age at death, 83.4 years; range, 70-99 years) had been fixed in 10% buffered formalin before use. After exposing the medial (44 Canals) or posterior half (14 Canals) of the bony Nasolacrimal Canal, the part with the shortest anteroposterior or transverse diameter was determined on inspection. These positions from the Canal entrance were measured, and the distance ratio, indicating where the shortest diameter was located in relation to the total length of the Canal, was calculated. Results The shortest anteroposterior and transverse diameters were at the entrance to the Canal in 32 of 44 Canals (72.7%) and in 9 of 14 Canals (64.3%), respectively. In the other Canals, the shortest anteroposterior and transverse diameters were located at an average of 3.6 and 5.6 mm from the entrance, and the distance ratios were 29.0% and 46.7%, respectively. The mean shortest anteroposterior and transverse diameters were 5.6 and 5.6 mm, respectively. Conclusions The shortest anteroposterior and transverse diameters were at the entrance of the Canal in most of the bony Nasolacrimal Canals. These results are comparable with the rate of obstruction at the Canal entrance in primary acquired Nasolacrimal duct obstruction.
-
the orientation of the lacrimal fossa to the bony Nasolacrimal Canal an anatomical study
Ophthalmic Plastic and Reconstructive Surgery, 2012Co-Authors: Juwan Park, Yasuhiro Takahashi, Takashi Nakano, Ken Asamoto, Masayoshi Iwaki, Dinesh Selva, Igal Leibovitch, Sukwoo Yang, Hirohiko KakizakiAbstract:PURPOSE To examine the relative positions of the lacrimal fossa (LF) and the bony Nasolacrimal Canal (BNLC) in relation to each other and a reference plane. METHODS Forty-two orbits and BNLCs from 21 Asian cadavers (9 men and 12 women; average age at death, 84.4 years; range, 70-99 years) had been fixed in 10% buffered formalin before use. After exposing the LF and the medial half of the BNLC, the authors measured the angles of the longitudinal axis of the LF and the BNLC relative to the aesthetic horizontal plane respectively. Based on these values, the relative orientation of the LF and the BNLC was determined and defined in terms of Δ BNLC-LF. A positive Δ BNLC-LF represents a Nasolacrimal Canal that descends posteriorly relative to the LF. RESULTS The mean LF, BNLC, and Δ BNLC-LF were 9.5°, 19.8°, and 10.3°, respectively. In 39 passages (92.9%), the Δ BNLC-LF was positive, representing a Nasolacrimal Canal that is more posteriorly oriented than the LF. In 3 passages (7.1%), the Δ BNLC-LF was equal to or less than 0°; 2 of them (4.8%) had a straight course and 1 passage (2.4%) had a negative value. CONCLUSIONS In most patients, the BNLC is directed more posteriorly than the LF. This finding may help in preventing an inadvertent false passage during probing and intubation in patients with epiphora.
Bradley N Lemke - One of the best experts on this subject based on the ideXlab platform.
-
an anatomical basis for primary acquired Nasolacrimal duct obstruction
Archives of Ophthalmology, 1997Co-Authors: Sarah A Groessl, Bryan S Sires, Bradley N LemkeAbstract:Objective: To measure any sex size differences in the bony Nasolacrimal drainage systems in a normal, agematched population. Methods: A retrospective study of axial cut maxillofacial computed tomographic scans was conducted. Three levels of the bony Nasolacrimal duct (NLD) system on the right and left sides were measured along the anteroposterior diameter. The data were analyzed using 2-tail t test, analysis of variance, and linear regression methods. Results: Scans from 71 adult patients (36 men and 35 women) were reviewed. Women were found to have a smaller bony diameter at the level of the lower fossa ( P =.01) and the middle NLD ( P =.06) compared with those of men. The adult inferior bony fossa increased in size with age in both men and women, while the middle NLD increased in size in men only. No significant size difference was found between the right and left side at any level. Conclusions: Size differences are found in measurements of bony Nasolacrimal excretory systems in men vs women. Women have significantly smaller dimensions in the lower Nasolacrimal fossa and the middle NLD. The anteroposterior dimension of the bony Nasolacrimal Canal at the fossa level enlarged in both sexes, with age coinciding with osteoporotic changes throughout the body. These quantitative anatomical observations provide a contributory factor to explain the increased prevalence of primary acquired NLD obstruction in women.
Guillaume Billet - One of the best experts on this subject based on the ideXlab platform.
-
comparative anatomy and phylogenetic contribution of intracranial osseous Canals and cavities in armadillos and glyptodonts xenarthra cingulata
Journal of Anatomy, 2021Co-Authors: Kevin Le Verger, Laureano Raul Gonzalez Ruiz, Guillaume BilletAbstract:The evolutionary history of the Cingulata, as for many groups, remains a highly debated topic to this day, particularly for one of their most emblematic representatives: the glyptodonts. There is no consensus among morphological and molecular phylogenies regarding their position within Cingulata. As demonstrated by recent works, the study of the internal anatomy constitutes a promising path for enriching morphological matrices for the phylogenetic study of armadillos. However, internal cranial anatomy remains understudied in the Cingulata. Here we explored and compared the anatomy of intracranial osseous Canals and cavities in a diverse sample of extant and extinct cingulates, including the earliest well-preserved glyptodont crania. The virtual 3D reconstruction (using X-ray microtomography) of selected Canals, that is, the Nasolacrimal Canal, the palatine Canal, the sphenopalatine Canal, the Canal for the frontal diploic vein, the transverse Canal, the orbitotemporal Canal, the Canal for the capsuloparietal emissary vein and the posttemporal Canal, and alveolar cavities related to cranial vascularization, innervation or tooth insertion allowed us to compare the locations, trajectories, and shape of these structures and to discuss their potential interest for cingulate systematics. We tentatively reconstructed evolutionary scenarios for eight selected traits related to these structures in which glyptodonts often showed a close resemblance to pampatheres, to the genus Proeutatus, and/or to chlamyphorines. This latter pattern was partly congruent with recent molecular hypotheses, but more research is needed on these resemblances and on the potential effects of development and allometry on the observed variations. Overall, these comparisons have enabled us to highlight new anatomical variation that may be of great interest to further explore the evolutionary history of cingulates and the origins of glyptodonts on a morphological basis.
Yasuhiro Takahashi - One of the best experts on this subject based on the ideXlab platform.
-
comparison of bony Nasolacrimal Canal narrowing with or without primary acquired Nasolacrimal duct obstruction in a japanese population
Ophthalmic Plastic and Reconstructive Surgery, 2014Co-Authors: Yasuhiro Takahashi, Kouhei Nakata, Hidetaka Miyazaki, Akihiro Ichinose, Hirohiko KakizakiAbstract:Purpose: To compare the minimum diameter of the Nasolacrimal Canal and its location between patients with or without primary acquired Nasolacrimal duct obstruction (NLDO) in a Japanese population. Methods: One hundred one patients with unilateral primary acquired NLDO (Group A, 101 affected sides; Group B, 101 unaffected sides) and 50 non-NLDO patients (Group C, 100 sides) were included. Anteroposterior and transverse diameters were measured at the Canal entrance and the shortest point using contiguous 1-mm axial computed tomographic images. Canal shapes were classified into 2 types: the “funnel” type (a Canal with both minimum diameters at the Canal entrance) and the “hourglass” type (a Canal with at least one minimum diameter in the Canal). The distance from the entrance to the part with the shortest diameter was measured on sides with the hourglass type. Results: The funnel type was found more frequently in Groups A and B than in Group C (p 0.050). Conclusions: Primary acquired NLDO patients exhibited the funnel type more frequently or there was a shorter distance from the entrance to the part with the shortest diameter than non-NLDO patients, which may enhance the risk of primary acquired NLDO.
-
consecutive microscopic anatomical characteristics of the lacrimal sac and Nasolacrimal duct cases with or without inflammation
Investigative Ophthalmology & Visual Science, 2014Co-Authors: Hidenori Mito, Yasuhiro Takahashi, Takashi Nakano, Ken Asamoto, Hiroshi Ikeda, Hirohiko KakizakiAbstract:PURPOSE We examined the consecutive microscopic anatomy of the lacrimal sac and Nasolacrimal duct with or without conspicuous inflammation. METHODS We used 18 postmortem lacrimal sacs and Nasolacrimal ducts of 12 Japanese subjects (5 males, 7 females, aged 75-98 years at death). The removed mucosal wall was transversely sectioned. The first slice was cut around the internal Canalicular punctum, the second slice was at the superior opening of the bony Nasolacrimal Canal, and the other four were harvested from the Nasolacrimal duct. All specimens were dehydrated and embedded in paraffin, cut into 7-μm thick sections, and stained with Masson's trichrome. RESULTS The lumen was larger in the lacrimal sac than in the Nasolacrimal duct. The lacrimal sac wall was less developed than the Nasolacrimal duct wall. All specimens but two showed a narrowed area in the Nasolacrimal duct. Specimens without conspicuous inflammation showed some subepithelial inflammatory cell infiltration. Goblet cells were smaller in number in the lacrimal sac with an increasing tendency in the inferior direction. Specimens with conspicuous inflammation showed narrowed portions in the Nasolacrimal duct, in which severe inflammation and exudate in the lumen was observed. The epithelium was denuded and goblet cells were lost. A specimen with focal inflammation illustrated similar findings in the inflammatory part, but the other parts were similar to the specimens without inflammation. CONCLUSIONS Consecutive microscopic anatomical characteristics of the lacrimal sac and Nasolacrimal duct were different from each other. A narrowed part of the Nasolacrimal duct lumen is speculated to be a risk for obstruction.
-
the narrowest part of the bony Nasolacrimal Canal an anatomical study
Ophthalmic Plastic and Reconstructive Surgery, 2013Co-Authors: Yasuhiro Takahashi, Takashi Nakano, Ken Asamoto, Masayoshi Iwaki, Dinesh Selva, Igal Leibovitch, Yasuhisa Nakamura, Hirohiko KakizakiAbstract:Purpose To determine the narrowest diameter of the bony Nasolacrimal Canal. Methods Fifty-eight bony Nasolacrimal Canals from 29 Japanese cadavers (12 men and 17 women; average age at death, 83.4 years; range, 70-99 years) had been fixed in 10% buffered formalin before use. After exposing the medial (44 Canals) or posterior half (14 Canals) of the bony Nasolacrimal Canal, the part with the shortest anteroposterior or transverse diameter was determined on inspection. These positions from the Canal entrance were measured, and the distance ratio, indicating where the shortest diameter was located in relation to the total length of the Canal, was calculated. Results The shortest anteroposterior and transverse diameters were at the entrance to the Canal in 32 of 44 Canals (72.7%) and in 9 of 14 Canals (64.3%), respectively. In the other Canals, the shortest anteroposterior and transverse diameters were located at an average of 3.6 and 5.6 mm from the entrance, and the distance ratios were 29.0% and 46.7%, respectively. The mean shortest anteroposterior and transverse diameters were 5.6 and 5.6 mm, respectively. Conclusions The shortest anteroposterior and transverse diameters were at the entrance of the Canal in most of the bony Nasolacrimal Canals. These results are comparable with the rate of obstruction at the Canal entrance in primary acquired Nasolacrimal duct obstruction.
-
the orientation of the lacrimal fossa to the bony Nasolacrimal Canal an anatomical study
Ophthalmic Plastic and Reconstructive Surgery, 2012Co-Authors: Juwan Park, Yasuhiro Takahashi, Takashi Nakano, Ken Asamoto, Masayoshi Iwaki, Dinesh Selva, Igal Leibovitch, Sukwoo Yang, Hirohiko KakizakiAbstract:PURPOSE To examine the relative positions of the lacrimal fossa (LF) and the bony Nasolacrimal Canal (BNLC) in relation to each other and a reference plane. METHODS Forty-two orbits and BNLCs from 21 Asian cadavers (9 men and 12 women; average age at death, 84.4 years; range, 70-99 years) had been fixed in 10% buffered formalin before use. After exposing the LF and the medial half of the BNLC, the authors measured the angles of the longitudinal axis of the LF and the BNLC relative to the aesthetic horizontal plane respectively. Based on these values, the relative orientation of the LF and the BNLC was determined and defined in terms of Δ BNLC-LF. A positive Δ BNLC-LF represents a Nasolacrimal Canal that descends posteriorly relative to the LF. RESULTS The mean LF, BNLC, and Δ BNLC-LF were 9.5°, 19.8°, and 10.3°, respectively. In 39 passages (92.9%), the Δ BNLC-LF was positive, representing a Nasolacrimal Canal that is more posteriorly oriented than the LF. In 3 passages (7.1%), the Δ BNLC-LF was equal to or less than 0°; 2 of them (4.8%) had a straight course and 1 passage (2.4%) had a negative value. CONCLUSIONS In most patients, the BNLC is directed more posteriorly than the LF. This finding may help in preventing an inadvertent false passage during probing and intubation in patients with epiphora.
горбачёв дмитрий степанович - One of the best experts on this subject based on the ideXlab platform.
-
squamous papilloma of the lacrimal sac and the Nasolacrimal Canal clinical case report
Ophthalmology, 2016Co-Authors: Yurii V Poritskii, порицкий юрий владимирович, Dmitriy Stepanovich Gorbachev, горбачёв дмитрий степановичAbstract:The article gives a detailed description of the clinical case of a rather rare eye disease - tumors of the lacrimal SAC and Nasolacrimal duct, that usualy is difficult in diagnosis and treatment. We used computer tomography, dacryocystography, endoscopy for examination. The operation of removing tumor of the lacrimal SAC is well described and illustrated. Distinctive appearance of squamous papilloma, which is different from the prevailing views of papilloma attracts attention. Also we noted the number of postopertive features. The paper includes review of the literature concerning tumors of the lacrimal SAC and Nasolacrimal duct, analisys of criteria for differential diagnostics of tumors of the lacrimal SAC, classification of malignant tumors of the lacrimal SAC in stages. The information obtained can contribute to the proper diagnosis and treatment of patients with pathology of the lacrimal drainage than will be useful for clinical ophthalmologists.
