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Biomedical subjects

M Ida

Publications and source records attributed to M Ida.

At least 37 records · Page 2Linked to original sources
PubMed1999

Spinal epidural varices.

A 16-year-old male experienced a sudden attack of back pain while walking through the corridor of school which required emergent hospitalization. Except for the back pain, no neurological symptoms were noted. Magnetic resonance (MR) imaging indicated an angiopathy-like flow void in the epidural region at Th 3-5 which seemed to explain the patient's back pain. Thoracic laminectomy at Th 3-5 and resection of the affected site were performed. Pathologically, the resected lesion only had a dilated normal vein and no findings indicating vascular deformity. The patient's outcome was good and no relapse of pain has occurred for about 2 years since the operation. Although some authors have reported vascular deformity with spinal epidural hemorrhage or varices with lumbar hernia of the intervertebral disc, there is no report concerning spinal epidural varices with pain only. The present case seemed to be a rare event and is reported here.

Adolescent↗
PubMed1999

True small lymphocytic T-cell chronic lymphocytic leukemia lacking the CD3 molecule and TCR-alpha beta on its cell surface.

We report a case of T-cell chronic lymphocytic leukemia (T-CLL) in which the lymphocytes were small and mature, did not have cytoplasmic granulation, and appeared to be similar to those of B-cell chronic lymphocytic leukemia (B-CLL). Immunophenotyping of the lymphocytes revealed CD2+, CD4+, CD5+, and CD25+ on the cell surface, but expression of the CD3 and TCR-alpha beta molecules was localized only in the cytoplasm. The clinical course was as indolent as that of B-CLL, and the patient was able to undergo open-heart surgery. Thus, we confirmed that true T-CLL is able to exist as a counterpart of B-CLL.

Aged↗
PubMed1999

[An autopsy case of pericallosal lipoma with mental retardation].

The patient was a 69-year-old male who had visited our psychological department due to mental retardation. Pericallosal lipoma was indicated by MRI taken during treatment. On December 30, 1998, the patient fell from steps and struck his forehead hard, and then limb palsy occurred. He was emergently brought to our hospital. Under the suspected diagnosis of traumatic cervical spinal cord injury, preventive therapy was performed to observe the clinical course in which paralysis gradually improved. On January 22, 1999, however, he died of cardiopulmonary arrest due to sudden suffocation. In general, the connection of choroid plexus lipoma and pericallosal lipoma is bilateral in most cases. In our patients, MRI suggested that a connection with cerebral ventricles through choroidal fissure existed with no right and left difference, however, autopsy findings revealed that the lipoma existed along the left cerebral arch with obvious connection only with the left choroid plexus. The present case seemed to be a very rare case.

Aged↗
PubMed1998

[Evaluation of hilar pulmonary vessels using magnetic resonance angiography (MRA)].

To evaluate the usefulness of magnetic resonance angiography (MRA) in pulmonary and mediastinal diseases, 24 cases (15 lung cancers, 2 metastatic lung tumors and 7 other diseases) were studied with the 3D FLASH (TE = 3 msec.) method. In resected cases, MRA images were compared with intraoperative findings. Twenty of 24 cases were consistent with intraoperative findings. In 4 resected cases in which the findings were inconsistent, pulmonary angiography (PAG) findings were similar to those of MRA. From these results, MRA is considered an effective and non-invasive method for evaluation of pulmonary vessels.

Aged↗
PubMed1998

Suppression of recurrent genital herpes simplex virus type 2 infection by Rhus javanica in guinea pigs.

Rhus javanica has been shown to exhibit anti-herpes simplex virus (HSV) activity and potentiate the anti-HSV activity of acyclovir in vitro and in vivo. This extract was examined for its suppressive efficacy on recurrent genital infection in guinea pigs. Guinea pigs were primarily infected intravaginally with HSV type 2 (HSV-2). Prophylactic oral administration, at the dose corresponding to human use, of R. javanica significantly reduced the incidence, severity and/or frequency of spontaneous and severe skin lesions as compared with latently infected guinea pigs administered with water. This prophylactic efficacy was confirmed by the crossover administration, for more than 2 months, of R. javanica and water to the infected guinea pigs. Toxicity, such as weight loss, from R. javanica administration was not observed in the guinea pigs. When recurrent HSV-2 disease was induced by ultraviolet irradiation 3 months after primary infection, the prophylaxis with R. javanica was also significantly effective in reducing the severity of ultraviolet-induced skin lesions. Thus, prophylaxis of recurrent genital HSV-2 infection with R. javanica may preserve the efficacy of acyclovir by reducing both the use of acyclovir and the appearance of acyclovir-resistant viruses.

Administration, Intravaginal↗
PubMed1998

Immune response to varicella-zoster virus glycoproteins in guinea pigs infected with Oka varicella vaccine.

A varicella skin test antigen has been developed based on the induction of delayed-type hypersensitivity to varicella-zoster virus (VZV), and has been used to evaluate the immune status to VZV. The authors have purified gB, gE:gI and gH:gL and examined their cutaneous reactivity in guinea pigs infected with Oka varicella vaccine. The cutaneous reaction to each glycoprotein was observed and the maturation process of cutaneous reaction was examined in infected guinea pigs. Cutaneous reaction to gH:gL, a major target of virus-neutralizing antibody, appeared first on day 3 among three glycoprotein complexes and the reaction to gE:gI, the most abundant glycoprotein, became strongest three weeks after infection. The earliest recognition of gH:gL may contribute to minimizing the spread of viral infection. Thus, the skin test may be a suitable marker to assess the cell-mediated immunity in varicella, including vaccine recipients and zoster, in relation to the immune status of glycoproteins.

Animals↗
PubMed1998

Adverse reactions to nonionic iodine in contrast-enhanced computed tomography: usefulness of monitoring vital signs.

OBJECTIVE: To report on adverse reactions to intravenous nonionic iodine contrast media and evaluate the usefulness of monitoring vital signs. MATERIAL AND METHODS: A prospective study of 1537 consecutive patients who received contrast-enhanced CT with nonionic iodine was performed. Systolic and diastolic arterial blood pressure, pulse rate and arterial blood oxygen saturation were monitored. Severity of adverse reactions was classified as minor, intermediate and severe. RESULTS: A total of 64 adverse reactions developed in 57 patients. The overall prevalence was 3.7% (57/1537). The most common symptom was nausea (18/64) followed by pharyngeal discomfort (11/64). One patient had a severe reaction consisting of prolonged hypotension. Four patients had an intermediate reaction, three transient hypotension or hypertension and one extensive urticaria and facial edema. In two out of four patients who became hypotensive or hypertensive, the reactions developed without any obvious clinical symptoms. CONCLUSIONS: Severe or life-threatening acute adverse reactions to intravenous nonionic iodine contrast media may develop without any obvious clinical symptoms. Monitoring vital signs is very helpful for early detection.

Adolescent↗
PubMed1998

Computed tomography in the diagnosis of maxillofacial mass lesions in younger children.

OBJECTIVE: To evaluate the CT findings of maxillofacial mass lesions in younger children and to discuss the effectiveness of CT in their differential diagnosis. PATIENTS AND METHODS: CT findings of 17 patients (age range, 0 years 5 months to 3 years 3 months) with histopathologically proven maxillofacial mass lesions were retrospectively evaluated. About two-thirds (11/17) comprised congenital lesions or more common lesions in infancy or younger children. RESULTS: Hemangiomas, dermoid cysts and ranulas in this age group presented characteristic CT findings in common with those occurring in adults. Two invasive lesions (melanotic neuroectodermal tumor and aggressive fibromatosis) had irregular margins and the latter also showed aggressive bone destruction. Two angiomas had irregular margins. A fibrosarcoma showed expansile bone destruction but had a regular margin. CONCLUSION: CT was useful in demonstrating the extent of maxillofacial mass lesions in children and for surgical treatment planning. Although some invasive lesions could be correctly diagnosed on the basis of CT, its diagnostic value in differentiating malignant from benign maxillofacial lesions in younger children was limited.

Ameloblastoma↗
PubMed1998

Thrombosed varix in the submandibular space.

Thrombosed varix in the oral region often appears as a pigmented mass in the mucosa simulating a hemangiomatous lesion. It rarely occurs in the deeper orofacial region. We report a case of thrombosed varix in the submandibular space with symptoms of a tumor. The clinical symptoms and MRI and CT findings are discussed. The clinical symptoms were not characteristics. High signal intensity on CT (80 HU) and a concentric signal distribution on CT and MRI may suggest a thrombosed varix.

Chin↗
PubMed1998

Hypocholesterolemic effects of the LDL receptor gene transcriptional upregulator CP-230821.

CP-230821 is a novel, potent LDL receptor gene transcriptional upregulator which decreases total plasma cholesterol level. Interestingly, this plasma LDL decrease does not alter hepatic lipid contents. A series of experiments was undertaken to study the molecular biology of this phenomenon. Twelve hours after CP-230821 treatment, the transcriptional activity and mRNA level of the LDL receptor gene in HepG2 cells were increased by 264% and 426%, respectively. Although treatment with the HMG-CoA reductase inhibitor compactin also increased LDL receptor gene transcription and mRNA, CP-230821 did not increase the level of HMG-CoA reductase gene transcription or mRNA. These results indicate that LDL receptor gene activity may play an important role in the decrease of plasma LDL level. These results further suggest that the LDL receptor gene and the HMG-CoA reductase gene are not strictly coordinately controlled.

Animals↗
PubMed1998

Further examination of various administration protocols of pegylated recombinant human megakaryocyte growth and development factor on thrombocytopenia in myelosuppressed mice.

Thrombopoietin (TPO) is the recently isolated lineage-dominant hematopoietic factor that plays a pivotal role in the regulation of megakaryocytopoiesis and thrombopoiesis. In vivo studies have shown that daily multiple injections of pegylated human megakaryocyte growth and development factor (PEG-rHuMGDF), a truncated molecule related to human TPO, modified with polyethylene glycol, greatly improve thrombocytopenia and in most cases anemia and neutropenia in myelosuppressed animal models. In this study, we further examined various administration protocols of PEG-rHuMGDF on thrombocytopenia in mice treated with a combination of irradiation and carboplatin. After the myelosuppressive treatment on Day 0, mice received the same amount of PEG-rHuMGDF beginning on Day 1 by a single, 3 times (on alternate days), or 7 day daily administration. A single injection of PEG-rHuMGDF significantly reduced the severity and duration of thrombocytopenia and anemia with a concomitant accelerated recovery of megakaryocytic and erythroid progenitors in the bone marrow, similar to the 2 other administration protocols. As the start of a single injection of PEG-rHuMGDF was delayed, its therapeutic effects were attenuated. These results indicate that an administration of PEG-rHuMGDF at an earlier time after the myelosuppressive treatment is necessary to improve thrombocytopenia and anemia.

Animals↗
PubMed1997

Differential diagnosis of tumours of the minor salivary glands of the palate by computed tomography.

OBJECTIVE: To define the CT criteria for differentiating malignant from benign tumours of the minor salivary glands of the palate and to evaluate their accuracy. PATIENTS AND METHODS: CT findings of 63 patients with histopathologically proven minor salivary gland tumours of the palate (23 malignant, 40 benign) were retrospectively evaluated. RESULTS: Aggressive bone destruction was a specific finding of malignant tumours, but was seen in only 57% (13/23) of this series. Extension into the pterygopalatine fossa was observed in seven malignant and one benign tumour. Calcifications within a tumour were observed in four cases, all of which were malignant. These three CT findings were significantly more frequent in malignant tumours. Using any one of these as the criterion for the malignancy, the sensitivity was 78% (18/23), specificity 98% (39/40) and accuracy 90% (57/63). CONCLUSION: Malignant tumours of the minor salivary glands of the palate are very likely to show any or all of aggressive bone destruction, extension into the pterygopalatine fossa and calcification, whereas benign tumours can almost always be correctly diagnosed by their absence.

Calcinosis↗
PubMed1997

Periosteal new bone formation in the jaws. A computed tomographic study.

OBJECTIVES: To investigate the diagnostic significance of a periosteal reaction (PR) in diseases of the jaws. METHODS: The frequency of PR was investigated in 1142 patients who had undergone CT of the maxilla or mandible. The pattern of PR was categorized as either parallel, irregular, spicule or Codman's triangle. We examined the relationship of the pattern of PR to the specific disease categories of osteomyelitis, trauma, cysts, benign tumours and malignant tumors. RESULTS: Seventy patients were found to have PR. It was found in 40% of cases with osteomyelitis and 15% of malignant tumors. The only benign lesion was an eosinophilic granuloma. There were no cysts. The frequency of PR was higher in younger patient and in those with sarcomas or bone metastases compared with those with carcinomas. Ninety-one percent of the patients with osteomyelitis showed single or multi-layered PR parallel to the cortical bone, while 61% of those with malignant tumors had a spicule pattern. With the exception of Codman's triangle, none of the PR patterns were specifically associated with any one disease category. When the PR pattern was combined with the pattern of cortical bone destruction, 90% of the patients with PR could be correctly assigned to one or other of the four disease categories of osteomyelitis, trauma, benign lesion or malignant tumor. CONCLUSIONS: The pattern of PR on CT in combination with the pattern of the cortical destruction of the cortex is useful in differentiating osteomyelitis from malignant tumors.

Adult↗
PubMed1997

Computed tomography in the diagnosis of buccal space masses.

OBJECTIVE: To evaluate the CT features of buccal space masses. PATIENTS AND METHODS: Fifty-three cases of buccal space masses were reviewed retrospectively. The diagnosis was confirmed histopathologically in all except two. CT images were assessed for the number, location, internal architecture and margin of the lesions and their relation to the surrounding structures. RESULTS: The series comprised 44 tumors (33 benign and 11 malignant) and nine non-tumorous lesions. Buccal gland tumors were all found adjacent to the outer surface of the buccinator, in contrast to epidermoid cysts and accessory parotid tumors which were completely separate from it. Hemangiomas were characterized by multiple masses or the presence of phleboliths. When ill-defined margins, violation of fascial planes and aggressive bone destruction were used as the criteria for the malignancy, only seven out of 11 malignant tumors were correctly diagnosed (sensitivity 64%). CONCLUSION: CT was useful in demonstrating the presence and location of the masses in the buccal space and sometimes in the differential diagnosis. For a mass of uncertain cause in the buccal space, a buccal gland tumor is the most likely diagnosis. The value of CT in differentiating malignant from benign buccal space lesions is limited.

Adolescent↗
PubMed1997

Transformation of Arabidopsis thaliana with the codA gene for choline oxidase; accumulation of glycinebetaine and enhanced tolerance to salt and cold stress.

Glycinebetaine is one of the compatible solutes that accumulate in the chloroplasts of contain halotolerant plants when these plants are exposed to salt or cold stress. The codA gene for choline oxidase, the enzyme that converts choline into glycinebetaine, has previously been cloned from a soil bacterium, Arthrobacter globiformis. Transformation of Arabidopsis thaliana with the cloned codA gene under the control of the 35S promoter of cauliflower mosaic virus enabled the plant to accumulate glycinebetaine and enhanced its tolerance to salt and cold stress. At 300 mM NaCl, considerable proportions of seeds of transformed plants germinated well, whereas seeds of wild-type plants failed to germinate. At 100 mM NaCl, transformed plants grew well whereas wild-type plants did not do so. The transformed plants tolerated 200 mM NaCl, which was lethal to wild-type plants. After plants had been incubated with 400 mM NaCl for two days, the photosystem II activity of wild-type plants had almost completely disappeared, whereas that of transformed plants remained at more than 50% of the original level. When exposed to a low temperature in the light, leaves of wild-type plants exhibited symptoms of chlorosis, whereas those of transformed plants did not. These observations demonstrate that the genetic modification of Arabidopsis thaliana that allowed it to accumulate glycinebetaine enhanced its ability to tolerate salt and cold stress.

Acclimatization↗
PubMed1997

[A case of hypertrophic spinal pachymeningitis].

A 79-year-old woman was admitted to our hospital complaining of gait disturbance. At the time of admission, she had incomplete monoparesis of the left lower extremity, with a sensory level of T6. MR images showed a thickened dura at the C6-T4 vertebral levels. The thickened dura showed low intensities on T1- and T2-weighted images, and was homogeneously enhanced by Gd-DTPA. Hypertrophic spinal pachymeningitis (HSP) was suspected, and laminectomy was performed from T2 to T3. The thickened dura was found and partially resected. Microscopically, the diagnosis was HSP. Steroid therapy was initiated after surgery. Postoperatively, the patient's physical status and radiographic images improved. The etiology of HSP is not clear in most cases. It is difficult to diagnose radiographically, although MR imaging can help differentiate it from other disorders. T1- and T2-weighted images of HSP show low intensities, and the T1-weighted image is homogeneously enhanced by Gd-DTPA. Treatment is early decompressive surgery with possible excision of the involved dura. Steroid therapy was effective in our case.

Aged↗