Konstantinos Vlasis

Aristotle University of Thessaloniki, Saloníki, Central Macedonia, Greece

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Publications (11)16.33 Total impact

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    ABSTRACT: Description of a rare variation is provided alongside with a review of the literature with special references to anatomic, embryologic, and clinical issues it may create. This was a cadaveric dissection conducted during a pregraduate anatomy course that is accompanied by short review of the literature and critical appraisal. During dissection of the neck region of a male cadaver, the superior thyroid artery occurred from the common carotid artery bilaterally and the lingual artery occurred from the carotid bifurcation on the left side. Superior thyroid artery originating from common carotid artery or carotid bifurcation is a common variation, but the lingual artery originating from the common carotid artery or carotid bifurcation is very rare (<1%). Its existence can have a significant impact on treatment success and potentially lead to errors during interventions at the neck region. A high level of suspicion is required.
    No preview · Article · Nov 2013 · Annals of Vascular Surgery
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    ABSTRACT: Background: The ossified ligaments (pterygospinous and pterygoalar) in the extracranial region of the foramen ovale are bony formations located at the lateral lamina of the pterygoid process of the sphenoid bone. The aim of this study was to investigate the incidence and morphology of the pterygospinous and pterygoalar bony bridges, the foramina resulting and their variations among Greeks and compare the findings with those available for others populations, underlying their clinical relevance. Materials and methods: In the present study, 71 Greek adult dry skulls (41 males and 30 females) investigated for the presence of pterygospinous and pterygoalar bony bridges. Results: Completely and incompletely ossified pterygospinous ligaments were found in 2.8% on the right, 4.2% on the left and in 8.4% on the right and in 7% on the left sides, respectively. Also completely and incompletely ossified pterygoalar ligaments were found in 2.8% on the right, 1.4% on the left, in 29.6% on the right and in 31% on the left sides, respectively. The pterygoalar and pterygospinous ligaments were completely ossified only in male skulls. Particularly, a completely ossified pterygospinous bar found in only one male skull, bilaterally. Conclusion: The knowledge of the detailed anatomy of these structures may increase the success of diagnostic evaluation and approaches to the region. The types of these osseous variations can cause mandibular neuralgia, impede anesthesia of the trigeminal ganglion, or cause entrapment of the lingual nerve and compression of the deep temporal, lateral pterygoid and buccal nerves, resulting in variant symptoms.
    Full-text · Conference Paper · May 2013
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    ABSTRACT: Introduction: Palmaris longus variations may include complete agenesis, variation in the location and form of the fleshy portion, aberrancy in attachment, duplication or triplication, accessory tendinous slips, replacing elements of similar form or position. Description of case: An anomalous palmaris longus muscle was found in the right upper extremity of a 63 year-old male cadaver. The muscle was totally fleshy without a long insertion tendon. Its origin was normal, the belly was rather broad and long, fusiform at the upper half and unipennate at the lower half of the forearm, and it was toggled into a short and thick tendon. At its insertion the tendon was split forming a second thinner tendon. The thick tendon was inserted into the flexor retinaculum and the thinner one into the palmar aponeurosis. The muscle compressed the median nerve although no related symptoms were reported on the cadaver's medical history. Discussion: This variation is of clinical importance because it may cause carpal tunnel syndrome or difficulties in image interpretation by radiologists. In addition the palmaris longus muscle is an anatomical landmark for operations at the forearm and wrist and its tendon can be used as a graft.
    No preview · Article · Oct 2012 · Hippokratia
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    ABSTRACT: The postsynaptic fibers of the pterygopalatine or sphenopalatine ganglion (PPG or SPG) supply the lacrimal and nasal glands. The PPG appears to play an important role in various pain syndromes including headaches, trigeminal and sphenopalatine neuralgia, atypical facial pain, muscle pain, vasomotor rhinitis, eye disorders, and herpes infection. Clinical trials have shown that these pain disorders can be managed effectively with sphenopalatine ganglion blockade (SPGB). In addition, regional anesthesia of the distribution area of the SPG sensory fibers for nasal and dental surgery can be provided by SPGB via a transnasal, transoral, or lateral infratemporal approach. To arouse the interest of the modern-day clinicians in the use of the SPGB, the advantages, disadvantages, and modifications of the available methods for blockade are discussed.▪
    No preview · Article · Sep 2011 · Pain Practice
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    ABSTRACT: The present study describes analytically a rare case in which lingual and facial arteries arise together from an external carotid artery in a common trunk. Thirty anatomic dissections were performed on 15 cadavers in the macroscopic laboratory in the Department of Anatomy of the Medical School of National and Kapodistrian University of Athens. One common trunk from which originated lingual and facial arteries was found. The frequency of this morphology is measured at 6 per cent. The length of the common trunk is measured at 7.3 mm between its origin and its diversion at the facial artery and lingual artery, its diameter at 2.8 mm, its distance from carotid bifurcation at 7.9 mm, and from the superior thyroid artery at 3.3 mm. At the left side of the neck region, facial and lingual arteries arose separately. The anatomic variations of the branching pattern of the external carotid artery and the micrometric values of the vessels are especially important as a result of the numerous operations performed in the neck region that implicate various specialties such as general surgery, head and neck surgery, plastic surgery, and maxillofacial surgery.
    No preview · Article · Feb 2011 · The American surgeon

  • No preview · Article · Jul 2009 · International journal of dermatology
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    ABSTRACT: Purpose The present study aimed at summarizing and presenting the anomalous muscles that a surgeon might encounter during axillary lymphadenectomy (AL). Methods For this purpose, both the anatomical and surgical literature was reviewed and an anatomical study on 107 cadavers was carried out. Furthermore, based on the anatomical features of the anomalous muscles that came up during our study and taking into consideration the landmarks of the AL, we further analyzed the complications that may arise from each of these muscles, along with their preoperative and intraoperative recognition and management. Results The literature review revealed that there are three supernumerary muscles that may affect the AL, namely the Langer's axillary arch, the pectoralis quartus and the chondroepitrochlearis muscles, as well as the aplasia of the lower part of the pectoralis major muscle. Eight out of the 107 (7.48%) cadavers that we dissected had such an abnormal muscle in the axilla. Specifically, the axillary arch was found unilaterally in five cadavers (4.67%) and the pectoralis quartus muscle was present unilaterally in three cadavers (2.8%). One cadaver had both an axillary arch and a pectoralis quartus muscle in the right side. The abdominal and almost the whole sternocostal portion of the pectoralis major as well the pectoralis minor muscle were absent in one cadaver (0.93%). The chondroepitrochlearis muscle was not found in any of the cadavers that we dissected. Conclusions The present study offers the necessary preoperative knowledge for recognizing these muscles during AL, avoiding thus the complications that may arise from them.
    Preview · Article · Apr 2009 · Breast Cancer Research and Treatment
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    ABSTRACT: The shape and the position of the stomach and its anatomic relations to the round viscera vary from individual to individual, but they also vary in the same subject depending on many factors. The downward displacement of the stomach is called gastroptosis. In the literature, there are only five case reports where the stomach constituted the content of a femoral hernia. The current study presents a case of a gastric femoral hernia in a cadaver along with a review of the relevant literature. During routine dissection of a 67-year-old male cadaver with a very large stomach and gastroptosis, a femoral hernia containing a part of the great curvature of the stomach was found. The length of the hernia sac was 5 cm, and its width was 3.5 cm. There was a disposition of the intestinal coils to the posterior wall and the lesser pelvis. The cadaver's former medical history and skin observation before dissection excluded any previous abdominal surgery. This is the second case of stomach herniation through the femoral ring in a male subject ever reported. The symptoms in this pathology vary from complete absence to symptoms due to high stenosis of the digestive tract, stomach strangulation and stomach wall necrosis.
    No preview · Article · May 2008 · Hernia
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    ABSTRACT: Cannulation of a central vein is an everyday procedure in anaesthesiology. However, anatomical variations of the size and/or location of the internal jugular vein might prevent cannulation, while repeated efforts might lead to severe complications. The aim of this retrospective study was to explore anatomical abnormalities of the internal jugular vein with regard to diameter of the vein's lumen and to define their clinical significance. The cervical regions of 93 cadavers, 186 sides in total, were dissected and the anatomical variations of internal jugular vein diameters in relation to the external jugular vein and to the common carotid artery were recorded and photographed. The diameter of the veins in three cases were less than 6 mm, while ipsilateral external jugular veins were larger than average (3/93). Anatomical variations of the internal jugular veins are clinically significant, especially in cases where venous access is important.
    Full-text · Article · May 2008 · European Journal of Anaesthesiology
  • K Natsis · K Vlasis · T Totlis · G Paraskevas · P Tsikaras
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    ABSTRACT: In the current study, we present a bilateral sternalis muscle, which was found during routine dissection of a 64 years-old Caucasian male cadaver. At the right side, the muscle had an unusual morphology, namely it consisted of three almost parallel strap-like muscle slips. Moreover, we discuss the innervation, origin and incidence of this variation, which are under controversy, as well as its clinical relevance.
    No preview · Article · Mar 2008 · Chirurgia (Bucharest, Romania: 1990)
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    ABSTRACT: Differential diagnosis of distended post-op colon can be misleading when based solely to imaging findings. A case report of an artefact giving the impression of faecal leak or foreign body (gossypiboma) in Spiral Computerized Tomography after colonic surgery is presented. The patient was managed conservatively due to the lack of clinical evidence of abdominal emergency, A second CT scan twenty days later revealed no findings besides minor colonic diverticulas.
    Preview · Article · Jul 2007 · Annali italiani di chirurgia

Publication Stats

65 Citations
16.33 Total Impact Points


  • 2008-2012
    • Aristotle University of Thessaloniki
      • Faculty of Medicine
      Saloníki, Central Macedonia, Greece
  • 2008-2011
    • Harokopion University of Athens
      Athínai, Attica, Greece
  • 2009
    • University of Ioannina
      • School of Medicine
      Yannina, Epirus, Greece
  • 2007
    • Κωνσταντοπούλειο νοσοκομείο Νέας Ιωνίας (Η Αγία Όλγα)
      Athínai, Attica, Greece