1421. Minimally invasive CT guided treatment of intraspinal synovial cystSergeja Kozar, Miran Jeromel, 2014, izvirni znanstveni članek Povzetek: Background. Intraspinal synovial cysts of vertebral facet joints are uncommon cause of radicular pain as well as neurological deficits. They can be managed both conservatively and surgically.Case report. A 77-year old polymorbid patient presented with bilateral low back pain which worsened during the course of time and did not respond to the conservative treatment. A diagnosis of intraspinal synovial cyst was made using the magnetic resonance imaging (MRI). Percutaneous computed tomography (CT) guided injection with installation of local anesthetic together with corticosteroid and rupture of the cyst was successfully used. A month after the procedure his pain improved, the usage of analgesics diminished and his over-all quality of life improved.Conclusions. Percutaneous CT guided lumbar synovial cyst treatment is safe and reliable alternative to the surgical treatment in polymorbid patients with radiculopathy who are not able to tolerate general anesthesia and operation. Ključne besede: ciste, intraspinalne sinovialne ciste, bolečina, zdravljenje, radiologija Objavljeno v DiRROS: 11.04.2024; Ogledov: 307; Prenosov: 177
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1422. Incidental uptake of 18F-fluorocholine (FCH) in the head or in the neck of patients with prostate cancerMarina Hodolič, Jurij Fettich, 2014, izvirni znanstveni članek Povzetek: Background. Positron emission tomography-computed tomography (PET/CT) with 18F-fluorocholine (FCH) is routinely performed in patients with prostate cancer. In this clinical context, foci of FCH uptake in the head or in the neck were considered as incidentalomas, except for those suggestive of multiple bone metastases. Case reports. In 8 patients the incidental focus corresponded to a benign tumour. The standard of truth was histologyin two cases, correlative imaging with MRI in four cases, 99mTc-SestaMIBI scintigraphy, ultrasonography and biochemistry in one case and biochemistry including PTH assay in one case. The final diagnosis of benign tumoursconsisted in 3 pituitary adenomas, 2 meningiomas, 2 hyperfunctioning parathyroid glands and 1 thyroid adenoma. Malignancy was proven histologically in 2 other patients: 1 papillary carcinoma of the thyroid and 1 cerebellar metastasis.Conclusions. To the best of our knowledge, FCH uptake by pituitary adenomas or hyperfunctioning parathyroidglands has never been described previously. We thus discuss whether there might be a future indication for FCH PET/CT when one such tumour is already known or suspected: to detect a residual or recurrent pituitary adenoma aftersurgery, to guide surgery or radiotherapy of a meningioma or to localise a hyperfunctioning parathyroid gland. Inthese potential indications, comparative studies with reference PET tracers or with 99mTc-sestaMIBI in case of hyperparathyroidism could be undertaken. Ključne besede: FCH, PET/CT, incidentaloma, meningioma, pituitary adenoma, hyperparathyroidism, thyroid adenoma Objavljeno v DiRROS: 10.04.2024; Ogledov: 354; Prenosov: 87
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1424. Clonality analysis of lymphoid proliferations using BIOMED-2 clonality assays : a single institution experienceIra Kokovič, Barbara Jezeršek Novaković, Petra Škerl, Srdjan Novaković, 2014, strokovni članek Ključne besede: onkologija, rak (medicina), limfom, diagnostika, analiza, molekularne metode, molekularna diagnostika Objavljeno v DiRROS: 10.04.2024; Ogledov: 307; Prenosov: 98
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1425. Domains without parabolic minimal submanifolds and weakly hyperbolic domainsFranc Forstnerič, 2023, izvirni znanstveni članek Povzetek: We show that if $\Omega$ is an $m$-convex domain in $\mathbb{R}^n$ for some $2 \le m < n$ whose boundary $b\Omega$ has a tubular neighbourhood of positive radius and is not $m$-flat near infinity, then $\Omega$ does not contain any immersed parabolic minimal submanifolds of dimension $\ge m$. In particular, if $M$ is a properly embedded non-flat minimal hypersurface in $\mathbb{R}^n$ with a tubular neighbourhood of positive radius, then every immersed parabolic hypersurface in $\mathbb{R}^n$ intersects $M$. In dimension $n=3$, this holds if $M$ has bounded Gaussian curvature function. We also introduce the class of weakly hyperbolic domains $\Omega$ in $\mathbb{R}^n$, characterised by the property that every conformal harmonic map $\mathbb{C} \to \Omega$ is constant, and we elucidate their relationship with hyperbolic domains, and domains without parabolic minimal surfaces. Ključne besede: minimal surfaces, m-plurisubharmonic functions, hyperbolic domain Objavljeno v DiRROS: 10.04.2024; Ogledov: 629; Prenosov: 489
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1426. The Waring problem for matrix algebras, IIMatej Brešar, Peter Šemrl, 2023, izvirni znanstveni članek Povzetek: Let $f$ be a noncommutative polynomial of degree $m\ge 1$ over an algebraically closed field $F$ of characteristic $0$. If $n\ge m-1$ and $\alpha_1,\alpha_2,\alpha_3$ are nonzero elements from $F$ such that $\alpha_1+\alpha_2+\alpha_3=0$, then every trace zero $n\times n$ matrix over $F$ can be written as $\alpha_1 A_1+\alpha_2A_2+\alpha_3A_3$ for some $A_i$ in the image of $f$ in $M_n(F)$. Ključne besede: Waring problem, noncommutatative polynomials, matrix algebras Objavljeno v DiRROS: 10.04.2024; Ogledov: 263; Prenosov: 131
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1427. Variety of mutual-visibility problems in graphsSerafino Cicerone, Gabriele Di Stefano, Lara Drožđek, Jaka Hedžet, Sandi Klavžar, Ismael G. Yero, 2023, izvirni znanstveni članek Povzetek: If $X$ is a subset of vertices of a graph $G$, then vertices $u$ and $v$ are $X$-visible if there exists a shortest $u,v$-path $P$ such that $V(P)\cap X \subseteq \{u,v\}$. If each two vertices from $X$ are $X$-visible, then $X$ is a mutual-visibility set. The mutual-visibility number of $G$ is the cardinality of a largest mutual-visibility set of $G$ and has been already investigated. In this paper a variety of mutual-visibility problems is introduced based on which natural pairs of vertices are required to be $X$-visible. This yields the total, the dual, and the outer mutual-visibility numbers. We first show that these graph invariants are related to each other and to the classical mutual-visibility number, and then we prove that the three newly introduced mutual-visibility problems are computationally difficult. According to this result, we compute or bound their values for several graphs classes that include for instance grid graphs and tori. We conclude the study by presenting some inter-comparison between the values of such parameters, which is based on the computations we made for some specific families. Ključne besede: mutual-visibility, total mutual-visibility, dual mutual-visibility number, outer mutual-visibility, grid graphs, torus graphs, computational complexity Objavljeno v DiRROS: 10.04.2024; Ogledov: 386; Prenosov: 145
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1428. On a definition of logarithm of quaternionic functionsGraziano Gentili, Jasna Prezelj, Fabio Vlacci, 2023, izvirni znanstveni članek Povzetek: For a slice-regular quaternionic function $f$, the classical exponential function ${\mathrm exp} f$ is not slice-regular in general. An alternative definition of an exponential function, the $\ast$-exponential ${\mathrm exp}_\ast$, was given in the work by Altavilla and de Fabritiis (2019): if $f$ is a slice-regular function, then ${\mathrm exp}_\ast f$ is a slice-regular function as well. The study of a $\ast$-logarithm ${\mathrm log}_\ast f$ of a slice-regular function $f$ becomes of great interest for basic reasons, and is performed in this paper. The main result shows that the existence of such a ${\mathrm log}_\ast f$ depends only on the structure of the zero set of the vectorial part $f_v$ of the slice-regular function $f = f_0 + f_v$, besides the topology of its domain of definition. We also show that, locally, every slice-regular nonvanishing function has a $\ast$-logarithm and, at the end, we present an example of a nonvanishing slice-regular function on a ball which does not admit a $\ast$-logarithm on that ball. Ključne besede: regular functions over quaternions, quaternionic logarithm of slice-regular functions Objavljeno v DiRROS: 10.04.2024; Ogledov: 334; Prenosov: 143
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1429. Critical edges in Rips complexes and persistencePeter Goričan, Žiga Virk, 2023, izvirni znanstveni članek Povzetek: We consider persistent homology obtained by applying homology to the open Rips filtration of a compact metric space $(X, d)$. We show that each decrease in zero-dimensional persistence and each increase in one-dimensional persistence is induced by local minima of the distance function $d$ When $d$ attains local minimum at only finitely many pairs of points, we prove that each above mentioned change in persistence is induced by a specific critical edge in Rips complexes, which represents a local minimum of $d$. We use this fact to develop a theory (including interpretation) of critical edges of persistence. The obtained results include upper bounds for the rank of one-dimensional persistence and a corresponding reconstruction result. Of potential computational interest is a simple geometric criterion recognizing local minima of $d$ that induce a change in persistence. We conclude with a proof that each locally isolated minimum of $d$ can be detected through persistent homology with selective Rips complexes. The results of this paper offer the first interpretation of critical scales of persistent homology (obtained via Rips complexes) for general compact metric spaces. Ključne besede: persistent homology, Rips complex, critical simplex, reconstruction result Objavljeno v DiRROS: 10.04.2024; Ogledov: 411; Prenosov: 276
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1430. Does age matter? : The well-being of migrant children in comparative perspectiveZorana Medarić, Barbara Gornik, 2024, izvirni znanstveni članek Povzetek: This article explores the subjective perceptions of well-being of migrant children attending primary school (9-14 years) and secondary school (15-18 years) in Slovenia. It focuses on how they conceptualise their fears, worries and concerns, what is important for them to feel accepted and safe, and how they think about their past and the future. Using a comparative perspective, similarities and differences in the experience of well-being of these two age groups of migrants are explored. The analysis is based on open-ended narrative interviews with migrant children and revolves around the question of whether and how age influences their subjective perception of well-being. The article sheds light on age-specific meanings and understandings of migration processes based on the views and experiences of migrant children and youth regarding their well-being, bringing to the fore the perspectives of children that are often missing or underrepresented in integration policy. Ključne besede: acceptance, agency, well-being, age differences, migrant children Objavljeno v DiRROS: 09.04.2024; Ogledov: 388; Prenosov: 137
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