Oral amelanotic melanoma: a case report

Objectives. Primary oral melanoma is a very rare malignancy, representing about 0.5% of all melanomas, characterized by a wide clinical-histological variability and a very aggressive behavior. Aim of the present study is to describe a case of oral amelanotic melanoma, an infrequent variant with a poorer prognosis than that of pigmented melanomas for a more aggressive biological behavior and frequent delays for the correct diagnosis and for starting the treatment. Case report. A 53-year-old white man referred at the Department Surgical, Oncological and Oral Sciences for a macular, scarsely pigmented lesion with irregular margins, located on anterior region of hard palate. The lesion, completely asymptomatic and without any history of trauma or injury, was observed by his dentist some months ago. The patient was a smoker (about 20 cigarettes a day for 30 years) and his anamnesis was negative for any systemic diseases and drug assumption. Histological examination, following the incisional biopsy, showed the hyperplasia of the junctional melanocytes with occasionally dendritic appearance and light atypia; on the recommendation of pathologist, a second incisional biopsy was performed, and a definitive diagnosis of “amelanotic melanoma in situ” was confirmed. After diagnosis, the patient was referred to the unit of Head and Neck Surgery for staging and surgical approach of the lesion. Conclusions. This case report underlines the importance to perform biopsy of all lesions of the oral cavity to rule out malignancy, even when slightly colored, asymptomatic and with a clinically harmless presentation. Besides benign diseases (e.g melanotic macules, nevi, extravasation of blood pigments, amalgam tattoos and deposition of other exogenous/endogenous pigments), rare variant of non-pigmented melanoma should be considered in order to avoid a dangerous diagnostic and therapeutic delay

Osteonecrosis of the jaw after long-term oral bisphosphonates, followed by short-term denosumab treatment for osteoporosis: a case report

Bisphosphonates and denosumab are antiresoptive agents and are mainly used for management of metastatic bone cancer, osteoporosis and other diseases. Bisphosphonates (BP) can reduce skeletal related events (SRE) by 30–50%1; denosumab (D) has been found even more effective than BP2. BP and D have been both associated to osteonecrosis of the jaw (ONJ). We report a case of an osteoporotic woman (62 yrs), complaining maxillary intense pain after a recent tooth molar extraction, observed in July 2013 at our centre. She mentioned previous treatments with monthly ibandronate (Bonviva ® 150 mg) per os (from January 2003 to April 2010), risedronate (35 mg weekly, from May 2010 to May 2012) and two administrations (in August 2012 and in January 2013) of denosumab (Prolia ®, 60 mg sc every 6 months). Of note, she also reported a previous incisor extraction that was performed in July 2012 (before denosumab) without ONJ onset. No further systemic or local risk factors were referred. Intraorally, bone exposure of right emimaxilla was present; osteolysis area was observed in in CT scans. According to Bedogni et al.3, the ONJ case was classified as stage II B. Medical therapy (ampicillin/sulbactam im 2 times/die, metronidazole per os 3 times/die, chlorhexidine 0.2% mouth rinses) was administered. One week later, the patient was asymptomatic but within the same stage (IIA); she was referred to Oral and Maxillofacial surgery for surgical management

L-PRF application in extraction sockets of bisphosphonate-treated patients: preliminary results

Bisphosphonate-related osteonecrosis of the jaw (BRONJ) is a severe adverse event related to bisphosphonates (BPs) therapy; tooth extraction has been described as the main trigger. Autologous platelet concentrates, such Leukocyte-Platelet Rich Fibrin (L-PRF, Intraspin !) are designed to release platelet growth factors, improving the tissue healing in oral surgery. The aim of this study was to evaluate the efficacy and safety of our dental extraction protocol applied in BPs patients

ORAL LESIONS DUE TO ACINETOBACTER BAUMANNII INFECTION IN A PATIENT AFFECTED BY AUTOIMMUNE HEMOLYTIC ANEMIA (AIHA): FIRST CLINICAL REPORT

Aim. Acinetobacter Baumannii (coming from the Greek “akinetos,” i.e. non-motile) is an opportunistic bacterial pathogen primarily associated with hospital-acquired infections. Commonly associated with aquatic environments, A. Baumannii easily contaminates the surrounding environment and it colonizes acute ill patients in which can survive for several days. Generally, A. Baumannii is able to damage mucous membranes or exposed skin after accident or injury; it may be responsible of many diseases such as pneumonia, bacteremia, meningitis, urinary tract infections, peritonitis and infections of skin and soft tissues. Tissues infected by A. Baumannii initially present “orange peel” appearance followed by sandpaper-like presentation, when there is a disruption, hemorrhagic bullae can be seen with a visible necrotizing process followed by bacteremia. Current therapy is based on intravenous administration of tigecycline 100-200 mg (first dose) and 50-100 mg every 12 h for up to 14 days, unless complications. If untreated, this infection can lead to septicemia and death. The mortality rate of this infection is high, especially in case of bacteremia (52%) and pneumonia (23–73%). A. Baumannii is resistant to many drugs and represents an important nosocomial pathogen that particularly infects critically ill patients. At the best of our knowledge, no case of oral infection has been reported. to present the first one case characterized by oral soft tissue infection due to A. Baumannii responsive to imipenem. Materials and methods. a 78 years male was hospitalized in August of 2013 at the Hematology unit of the A.O.U.P. “P. Giaccone” of Palermo with a diagnosis of autoimmune hemolytic anemia (AIHA). He was treated per os with corticosteroids (Prednisone) and immunosuppressants (Rituximab and Cyclophosphamide), also IVIG (Intra Venous Immuno-Globulin) was administreted. In November 2013, the patient was treated with piperacillin IV (Tazocin) for treating an urinary tract infection; four days after, multiple oral ulcerative bullous lesions on the lingual and buccal mucosa and crusted lesions on the lip vermilion appeared, associated with intense pain. An oral swab for bacteria research was carried out; topical therapy (chlorhexidine rinses and hyaluronic acid gel) has been prescribed and piperacillin therapy was stopped. Oral swab outcome resulted positive for A. Baumannii and Enterococcus Faecalis, both sensitive only to imipenem, that was administrated (500 mg IV every 8h) for 10 days. The patient was immediately isolated in a single room for preventing and controlling the spread of A. Baumannii. Results. From diagnosis, every 3 days clinical examination of the oral cavity was performed, revealing the progressive regression within thirty days until complete healing without leaving scars. After, a second oral swab confirmed the absence of any bacteria. Conclusions. The World Health Organization has recently identified antimicrobial resistance as one of the three most important problems facing human health and among the most common and serious pathogens, including A. Baumannii. It is an emerging potentially drug-resistant micro-organism and its isolation must alert physicians to carry on all preventive measures for avoiding contamination of other patients, especially those immunosuppressed, at risk for severe persistent infections or death. This precaution should be continued for all the duration of hospitalization and until the negativization of culture samples was obtained. It is important that physicians and dentists recognize suspicious lesions in unusual locations, such as oral mucosa, in absence of other known etiological factors in a timely manner before the diffusion among other patients in order to avoid the spread of a nosocomial outbreak

Collapse and revival of oscillations in a parametrically excited Bose-Einstein condensate in combined harmonic and optical lattice trap

In this work, we study parametric resonances in an elongated cigar-shaped BEC in a combined harmonic trap and a time dependent optical lattice by using numerical and analytical techniques. We show that there exists a relative competition between the harmonic trap which tries to spatially localize the BEC and the time varying optical lattice which tries to delocalize the BEC. This competition gives rise to parametric resonances (collapse and revival of the oscillations of the BEC width). Parametric resonances disappear when one of the competing factors i.e strength of harmonic trap or the strength of optical lattice dominates. Parametric instabilities (exponential growth of Bogoliubov modes) arise for large variations in the strength of the optical lattice.Comment: 9 pages, 20 figure

Bogoliubov spectrum and Bragg spectroscopy of elongated Bose-Einstein condensates

The behavior of the momentum transferred to a trapped Bose-Einstein condensate by a two-photon Bragg pulse reflects the structure of the underlying Bogoliubov spectrum. In elongated condensates, axial phonons with different number of radial nodes give rise to a multibranch spectrum which can be resolved in Bragg spectroscopy, as shown by Steinhauer {\it et al.} [Phys. Rev. Lett. {\bf 90}, 060404 (2003)]. Here we present a detailed theoretical analysis of this process. We calculate the momentum transferred by numerically solving the time dependent Gross-Pitaevskii equation. In the case of a cylindrical condensate, we compare the results with those obtained by linearizing the Gross-Pitaevskii equation and using a quasiparticle projection method. This analysis shows how the axial-phonon branches affect the momentum transfer, in agreement with our previous interpretation of the observed data. We also discuss the applicability of this type of spectroscopy to typical available condensates, as well as the role of nonlinear effects.Comment: 8 pages, 7 figures, minor changes, typos correcte

The treatment of medication-related osteonecrosis of the jaw (Mronj): A systematic review with a pooled analysis of only surgery versus combined protocols

Medication-related osteonecrosis of the jaw (MRONJ) is a serious adverse reaction of antiresorptive and antiangiogenic agents, and it is also a potentially painful and debilitating condition. To date, no specific studies have prospectively evaluated the efficacy of its treatment and no robust standard of care has been established. Therefore, a systematic review (2007–2020) with a pooled analysis was performed in order to compare MRONJ surgical techniques (conservative or aggressive) versus combined surgical procedures (surgery plus a non-invasive procedure), where 1137 patients were included in the pooled analysis. A statistically significant difference in the 6-month improvement rate, comparing combined conservative surgery versus only aggressive (91% versus 72%, p = 0.05), was observed. No significant difference regarding any group with respect to the 6-month total resolution rate (82% versus 72%) was demonstrated. Of note, conservative surgery combined with various, adjuvant, non-invasive procedures (ozone, LLLT or blood component + Nd:YAG) was found to achieve partial or full healing in all stages, with improved results and the amelioration of many variables. In conclusion, specific adjuvant treatments associated with minimally conservative surgery can be considered effective and safe in the treatment of MRONJ, although well-controlled studies are a requisite in arriving at definitive statements