Michio Yamasaki

Analysis of adenoid cystic carcinoma treated by radiotherapy

The records of 41 patients with adenoid cystic carcinoma of the head and neck region who had been treated with radiotherapy were reviewed. Local control was achieved in 72.3% in the cases with primary lesions at 5 years. The prognosis for tumors that arose in the major salivary glands was better than that for tumors that arose in the minor salivary glands; however, the difference was not statistically significant. In the minor salivary glands, early-stage tumors were well controlled with the use of radiation therapy alone. In spite of the high local control rate, the disease-free survival rate of the patients at 10 years was only 20.8%. Lung metastasis determined the prognosis.

Temporal Abscess due to Odontogenic Infection : Report of a Case

Due to acute inflammation of the tissue around the 1st molar in the left mandible, a lesion developed into an abscess in the temporal region. Magnetic Resonance Imaging (MRI) was very useful to detect the area of inflammation and to treat the abscess.

Characteristic findings of adenoid cystic carcinoma on MR imaging and differentiation from squamous cell carcinoma

Ten patients with adenoid cystic carcinoma and 49 with squamous cell carcinoma confirmed by aiopsy were evaluated. In these patients, malignant tumors were suspected with clinical progressions and clinical symptoms. The purpose of this study was to analyze and discuss the characteristic findings on MR imaging of adenoid cystic carcinoma in the head and neck, and to examine the usefulness of MR imaging in the differentiation between adenoid cystic carcinoma and squamous cell carcinoma. The characteristics on MR imaging of adenoid cystic carcinoma are a high signal intensity on T2-weighted images, marked enhancement by Gd-DTPA, and a capsular structure. All cases of recurrent adenoid cystic carcinomas also showed upward extension. We consider that the high signal intensity on T2-weighted images, the marked contrast enhancement and the capsular structure in MR imaging can be useful in differentiating adenoid cystic carcinoma and squamous cell carcinoma.

A case of static bone cavity

Herein, we present a case of static bone cavity. Results of radiological examination involving sialography in conjunction with CT are presented along with a review of the literature. Identification of the defect in the lingual mandible is necessary for the diagnosis of this abnormality, and we recognize that CT is the most appropriate examination method for the differential diagnosis of this defect. CT depicts the lesion clearly so that determination of the content is possible. Consequently, if this abnormality is suspected by conventional roentgenology such as panoramic radiography, we consider that the case should be immediately followed by CT examination.Herein, we present a case of static bone cavity. Results of radiological examination involving sialography in conjunction with CT are presented along with a review of the literature. Identification of the defect in the lingual mandible is necessary for the diagnosis of this abnormality, and we recognize that CT is the most appropriate examination method for the differential diagnosis of this defect. CT depicts the lesion clearly so that determination of the content is possible. Consequently, if this abnormality is suspected by conventional roentgenology such as panoramic radiography, we consider that the case should be immediately followed by CT examination.

Invasion of the intracranial space by a malignant odontogenic mixed tumor: Report of a case

A case of an odontogenic tumor which invaded the intracranial space from the mandible is reported. Judging from the radiographic images it was similar to a malignant tumor. The patient died 17 years after the first visit. According to the final pathological diagnosis, it was malignant odontogenic mixed tumor of low grade which did not belong to any of the WHO classification.

Louis Harold Gray (November 10, 1905–July 9, 1965): a pioneer in radiobiology

Louis Harold Gray was the only child of Harry and Amy Gray, born in London on November 10, 1905. His father was a lower class laborer employed at a post office as a telegraph operator in Britain’s deeply rooted class system. His mother needed a side job to support the household economy. During his childhood, Gray went walking on Sunday mornings with his father in Barnes, Wimbledon Common, and Richmond Park. Gray’s father was a man of few words, but was good at mathematics. On their walks, Gray’s father would present him with problems to solve related to the purchase and sale of fruit, and Gray mentally calculated the answers. Gray’s father was delighted that his son had answers to all the problems perfectly, regardless of how many problems were presented to him. This repeated practice, coupled with his innate genius, meant that Gray excelled at mathematics before beginning his formal education. Gray entered the Latimer School at the age of five, and he earned excellent grades, and was granted a scholarship at the age of 13. The scholarship allowed him to attend Christ’s Hospital, a public school. Gray lived in a dormitory, while he was there, which meant that he saw his parents only on holidays, but his parents visited him then and enjoyed talking with him about his grades.

Rolf Maximilian Sievert (1896–1966): father of radiation protection

Rolf Maximilian Sievert’s father, Max Sievert (1849–1913), was the eldest son of Heinrich Theodor Sievert, who served as the chairman of the town council in Zittau, East Germany (near the border of Czechoslovakia). After completing the compulsory education of the time, Max often visited Russia and Northern European countries for business purposes while working for an agency that specialized in the handling of machines. He felt that acting as an interface between Germany and Sweden through trading would surely lead him to success and established the Max Sievert Company in Stockholm in 1881, specializing in the wholesale trade of machines. The company not only imported German machines and tools, but expanded by exporting products manufactured in Sweden. The company grew substantially by producing telephone cables in Sweden and became the Max Sievert Manufacturing Co. Ltd. Max obtained Swedish citizenship in 1885 and married Sofia Carolina Pancheen in 1894. Their daughter, Lisa, was born in 1895, and son Rolf Sievert was born on May 6, 1896. The children grew up comfortably. Max died in 1913 when Sievert was 17 years old. Sievert inherited an enormous fortune from his father, enough so that he could live a comfortable life on the interest alone. 2 Education

Antoine Henri Becquerel (1852–1908): a scientist who endeavored to discover natural radioactivity

Antoine Henri Becquerel [1] (Fig. 1) was born in Paris on December 15, 1852, in the Becquerel family, which was a family of renowned scientists. Starting with his grandfather, members of three generations of the Becquerel family were physicists, and they had an extraordinary interest in phosphorescence and fluorescence. His grandfather, Antoine César Becquerel (1788–1878), was a member of the inaugural class of the École Polytechnique [2]. He joined the army during the war waged by Napoleon against Spain. After that, he became a first-generation professor in the department of applied physics of the Musée d’ Histoire Naturelle [3], which is dedicated to scientific research. He wrote two books on phosphorescence. His father, Alexandre Edmond Becquerel (1820–1891), started as an assistant and became a professor at the École Polytechnique. He was also a professor at the Musée d’ Histoire Naturelle. He received a degree of Doctor of Science from the University of Paris. He conducted scientific research on the effect of light, and he was among those who photographed the spectrum of sunlight for the first time. Moreover, he was an authority on fluorescence and had a particularly good knowledge about uranium. He designed a phosphoroscope with which he measured the intensity and duration of the fluorescence of uranium under various lightrays. Antoine Henri Becquerel of the third generation entered the École Polytechnique in 1872. In 1874, he was enrolled at the École des Ponts et Chaussées and studied civil engineering for 3 years. For some time, he worked in the Ministry of Construction as a civil engineer, but after pursuing research as an assistant to his father, he also became a professor of applied physics at the Musée d’ Histoire Naturelle in 1892. He received a degree of Doctor of Science from the University of Paris. He was also selected as a member of the Académie des Sciences, published research articles on fluorescence and phosphorescence, and joined the École Polytechnique as a professor. He became a leading scientist in the field of phosphorescence and fluorescence along with his father, and he held high-ranking positions in academic societies with his many research achievements.

Actinomycosis originating in the submandibular gland: Report of a case

We report herein a very rare case of actinomycosis originating in the submandibular gland in which malignancy was suspected. A 56-year-old man visited our clinic with a chief complaint of painless mass in the right submandibular region. From the imaging diagnosis, we suspected malignant tumor in the submandibular gland. Under general anesthesia, right radical neck dissection and excision of the submandibular gland with the above mass were carried out. Histopathological diagnosis of actinomycosis in the submandibular gland was made. Because the focus exists within the gland, we consider this case as a primary submandibular gland actinomycosis. Two years postoperatively, the tumor has not recurred. On diagnosis, it is necessary to differentiate this disease with other benign or malignant tumors.

Displacement of the tooth root into mandibular canal

Tooth root displacement in most cases is caused iatrogenically during tooth extraction. There are many reports in the literature of displacement of upper teeth into the maxillary sinus and of lower wisdom teeth into the surrounding soft tissue. A very rare case of displacement into the mandibular canal is presented herein, and, to our knowledge, no such cases have been reported to date. The patient was a 37-year-old man who underwent extract ion of the right mandibular 1st molar tooth at a local dental office on January 8 of 1991. In the middle of January 1992, the patient noticed swelling of the gingiva in the right mandibular region. This swelling gradually worsened and he visited our clinic on January 30.