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Search Results: 1 - 10 of 153 matches for " Stylianos Kapetanakis "
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Rapidly Growing Chondroid Syringoma of the External Auditory Canal: Report of a Rare Case
Ioannis Vasileiadis,Stylianos Kapetanakis,Aristotelis Petousis,Euthimios Karakostas,Christos Simantirakis
Case Reports in Medicine , 2011, DOI: 10.1155/2011/589680
Abstract: Introduction. Chondroid syrinoma of the external auditory canal is an extremely rare benign neoplasm representing the cutaneous counterpart of pleomorphic adenoma of salivary glands. Less than 35 cases have been reported in the international literature. Case Presentation. We report a case of a 34-year-old male in whom a rapidly growing, well-circumscribed tumor arising from the external auditory canal was presented. Otoscopy revealed a smooth, nontender lesion covered by normal skin that almost obstructs the external auditory meatus. MRI was performed to define the extension of the lesion. It confirmed the presence of a 1.5×0.8 cm T2 high-signal intensity lesion in the superior and posterior wall of EAC without signs of bone erosion. The patient underwent complete resection of the tumor. The diagnosis was confirmed by histopathologic examination. Conclusion. Although chondroid syringoma is extremely rare, it should always be considered in the differential diagnosis of an aural polyp. Chondroid syringomas are usually asymptomatic, slow-growing, single benign tumors in subcutaneous or intradermal location. In our case, the new information is that this benign tumor could present also as a rapidly growing lesion, arising the suspicion for malignancy.
A giant adrenal lipoma presenting in a woman with chronic mild postprandial abdominal pain: a case report
Stylianos Kapetanakis, Ioannis Drygiannakis, Anastasios Tzortzinis, Nikolaos Papanas, Aliki Fiska
Journal of Medical Case Reports , 2011, DOI: 10.1186/1752-1947-5-136
Abstract: A 54-year-old Caucasian woman presented several times over a period of 10 years to various emergency departments complaining of long-term mild postprandial abdominal pain. Although clinical examinations were unrevealing, an abdominal computed tomography scan performed at her most recent presentation led to the identification of a large lipoma of the left adrenal gland, which occupied most of the retroperitoneal space. Myelolipoma was ruled out due to the absence of megakaryocytes, immature leukocytes, or erythrocytes. Liposarcoma was ruled out due to the absence of lipoblasts. The size of the lipoma (16 × 14 × 7 cm) is, to the best of our knowledge, the second largest reported to date. After surgical resection, our patient was relieved of her symptoms and remains healthy six years postoperatively.Physicians should be aware that differential diagnosis of mild chronic abdominal pain in patients presenting in emergency rooms may include large adrenal lipomas. When initial diagnostic investigation is not revealing, out-patient specialist evaluation should be planned to enable appropriate further investigations.Adenomas, pheochromocytomas, and adrenocortical carcinomas represent the most common tumors of the adrenal glands [1]. In contrast, lipomatous tumors are rare, comprising 4.8% of all primary adrenal tumors and include myelolipomas, lipomas, angiomyolipomas, and liposarcomas [2,3], myelolipomas being the most common [4]. Adrenal lipomas are uncommon. However, the widespread use of ultrasound and computed tomography (CT) has led to their being increasingly discovered as incidental findings during routine examination. Their overall incidence on autopsy is 6% and 4% in imaging studies [5]. Their frequency tends to increase with age.A total of 18 cases have been reported since 1966, as summarized in Table 1[2-4,6-14]. In all, 58% were asymptomatic or were found post-mortem [3,6,8,10,11]. However, there are case reports of adrenal lipomas presenting either with acute ab
Unusual Intramuscular Lipoma of Deltoid Muscle
Stylianos Kapetanakis , Jiannis Papathanasiou , Antonios Dermon , Alexandra Dimitrakopoulou , Athanasios Ververidis , Pelagia Chloropoulou , Konstantinos Kazakos
Folia Medica , 2010, DOI: 10.2478/v10153-010-0050-x
Abstract: Lipomas are common soft tissue tumors usually located under the skin. Nevertheless, intramuscular lipomas of deltoid muscle are unusual tumors. We present a case of 74 years old woman with an intramuscular like clepsydra lipoma of deltoid muscle. The lesion was a palpable soft mass at the lateral side of the humerus. The patient had no previous history of trauma. The main symptom was pain only in abduction and extension. Imaging, pathological findings and surgical excision are discussed.
Characterization of Rational Numbers Using Kronecker’s Orbit: A Didactic Approach  [PDF]
Petros-Stylianos Marsellos
Creative Education (CE) , 2018, DOI: 10.4236/ce.2018.915193
Abstract: For every real number x, we define as integer part the biggest integer k so that kx and is expressed [x]. The difference of the number from its integral part is defined as decimal part of x and expressed with \"\". Consequently, for every x, the Kronecker’s orbit is defined, namely the set \"\". Through Kronecker’s orbit, rational numbers are characterized as the numbers whose orbit is a bounded set, while irrational numbers are characterized as the numbers whose orbit is a dense set. Using this fundamental theoretical result and utilizing a computer, a didactic approach was established, initially referring to the definition of rational numbers as fraction equivalence classes and basically to the segregation of rational and irrational numbers. This didactic approach also incorporates elements of ancient Greek mathematics history. The proposition was applied to students and was evaluated.
Augmented Reality Platforms for Virtual Fitting Rooms
Ioannis Pachoulakis,Kostas Kapetanakis
International Journal of Multimedia & Its Applications , 2012,
Abstract: Multi-sensor body scanners combined with new algorithms and social media technologies have started a revolutionary shift away from the classic desktop paradigm and into the direction of intuitive, “natural interaction” where people interface with the technological world through hand gestures, speech and body language. This article reviews recent examples of Virtual Fitting Rooms (VFRs) and supporting technologies which facilitate the shopping experience by letting customers to try-on apparel and/or mixand-match accessories without being physically present in the retail shop. These platforms are not only powerful decision tools for the on-line shopper, but also contribute to the fun factor of in-store shopping. Using depth scanning techniques, VFRs can create accurate 3D models of shoppers and meaningfully query retail digital catalogs, filter out non-fitting items and allow customers assess the styling andmatching aspects in real time. In addition, omnipresent social networking features allow sending photos or videos of the shopper wearing the apparel for quick feedback. The quality of service provided by current VFRs is sufficiently high to boost sales but also minimize returns due to improper fit.
On the Laplace Normal Vector Field of Skew Ruled Surfaces
Stylianos Stamatakis
Mathematics , 2015,
Abstract: We consider the Laplace normal vector field of relatively normalized ruled surfaces with non-vanishing Gaussian curvature in the three-dimensional Euclidean space $\mathbb{R}^{3}$. We determine all ruled surfaces and all relative normalizations for which the Laplace normal image degenerates into a point or into a curve. Moreover, we study the Laplace normal image of a non-conoidal ruled surface whose relative normals lie on the asymptotic plane.
On the Tchebychev Vector Field in the Relative Differential Geometry
Stylianos Stamatakis
Mathematics , 2015,
Abstract: In this paper we deal with relative normalizations of hypersurfaces in the (n+1)-dimensional Euclidean space $\mathbb{R}^{n+1}$. Considering a relative normalization $\bar{y}$ of an hypersurface $\Phi$ we decompose the corresponding Tchebychev vector $\bar{T}$ in two components, one parallel to the Tchebychev vector $\bar{T}_{EUK}$ of the Euclidean normalization $\bar{\xi}$ and one parallel to the orthogonal projection $\bar{y}_{T}$ of $\bar{y}$ in the tangent hyperplane of $\Phi$. We use this decomposition to investigate some properties of $\Phi$, which concern its Gaussian curvature, the support function, the Tchebychev vector field etc.
Characterizations of special skew ruled surfaces by the normal curvature of some distinguished families of curves
Stylianos Stamatakis
Mathematics , 2015,
Abstract: We consider skew ruled surfaces in the three-dimensional Euclidean space and some geometrically distinguished families of curves on them whose normal curvature has a concrete form. The aim of this paper is to find and classify all ruled surfaces with the mentioned property.
W-surfaces having some properties
Stylianos Stamatakis
Mathematics , 2015, DOI: 10.1007/BF03322861
Abstract: We investigate some characteristic properties of specific Weingarten surfaces in the three-dimensional Euclidean space using the nets of the lines of curvature resp. the asymptotic lines on both central surfaces of them.
Fulfillment Request Management (The approach)
Stylianos Gkoutzioupas
Computer Science , 2014,
Abstract: In this paper we introduce the term FRM (Fulfillment Request Management). According to the FRM in a BSS / OSS environment we can use a unified approach to implement a SOA in order to integrate BSS with OSS and handle 1. Orders 2. Events 3. Processes. So in a way that systems like ESB, Order Management, and Business Process Management can be implemented under a unified architecture and a unified implementation. We assume that all the above mentioned are 'requests' and according to the system we want to implement, the request can be an event, an order, a process etc. So instead of having N systems we have 1 system that covers all the above (ESB, Order Management, BPM etc) With the FRM we can have certain advantages such as: 1. adaptation 2. Interoperability. 3. Re-usability 4. Fast implementation 5. Easy reporting. In this paper we present a set of the main principles in order to build an FRM System.
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