Biomedical subjects

S Ehara

Publications and source records attributed to S Ehara.

121 records · Page 7Linked to original sources

PubMedDate not supplied

Virtual CT endoscopy in determining safe surgical entrance points for paranasal mucoceles.

The goal of this work was to evaluate virtual CT endoscopy for determining safe surgical entrance points for paranasal mucoceles. Twelve mucoceles in 11 cases were scanned with helical CT, and multiplanar reconstruction (MPR) and virtual endoscopic images were obtained. After a safe surgical entrance point was determined by MPR images, the entrance point was specified on the virtual endoscopic images. The combination of virtual endoscopic images and MPR images is a suitable method for determining a safe surgical entrance point for simple mucoceles.

Endoscopy↗

PubMedDate not supplied

Familial occurrence of telangiectatic osteosarcoma: cousin cases.

Familial occurrence of osteosarcoma is rare. We report cousin cases, an 11-year-old girl and an 8-year-old boy with telangiectatic osteosarcoma. The tumors occurred in the metaphysis of the distal tibia and the lamina of thoracic vertebra. The local behaviors appeared aggressive, but the clinical courses were relatively indolent in both cases. The histologic features were similar, showing anaplastic tumor cells producing osteoid and proliferation of blood cavities. Clustering of malignancies within a family suggests the presence of a genetic factor.

Bone Neoplasms↗

PubMedDate not supplied

Volar dislocation of the capitate.

In this report we describe a case of volar dislocation of the capitate associated with dislocation of the ulnar side of the carpometacarpal joint. Forced dorsiflexion of the wrist caused the rotation and volar displacement of the proximal portion of the capitate. Dislocation of the capitate is rare and may be seen in more complex injuries. An awareness of this type of injury may contribute to prompt diagnosis and treatment.

Accidents, Occupational↗

PubMedDate not supplied

Macrodystrophia lipomatosa: CT and MR findings.

Macrodystrophia lipomatosa is a congenital macrodactyly characterized by proliferation of all mesenchymal components, particularly fibroadipose tissue. We report imaging features of two such patients. MR imaging and CT scanning demonstrated proliferation of fatty tissue in the territory of the median nerve in the hands and forearms, characteristic of macrodystrophia lipomatosa.

Adipose Tissue↗

PubMedDate not supplied

Superselective continuous arterial infusion chemotherapy through the superficial temporal artery for oral cavity tumors.

BACKGROUND AND PURPOSE: High-dose intraarterial chemotherapy with repeated one-shot infusion may be useful for treating head and neck tumors. We evaluated the efficacy of superselective continuous arterial infusion chemotherapy administered via a coaxial catheter system and compared the results with those of subselective catheterization for treatment of oral cavity tumors. METHODS: Forty-nine consecutive patients with tumors of the oral cavity (clinical stage I, 12 cases; stage II, 19 cases; stage III, six cases; stage IV, 12 cases) were treated by arterial infusion chemotherapy. After a guiding catheter was advanced into the superficial temporal artery, superselective catheterization was performed using a coaxial system microcatheter. Superselective catheterization was accomplished in 34 cases, and was unsuccessful in 15, owing to difficulties in performing catheterization or to multiple feeding arteries. In the latter cases, the tip of the catheter was placed near the origin of the feeding arteries (subselective catheterization). RESULTS: Thirty (88%) of 34 patients had a complete response to superselective arterial infusion chemotherapy and two (6%) had a partial response. Twelve (80%) of 15 patients had a complete response to subselective arterial infusion chemotherapy and three (20%) had a partial response. Local recurrence was more frequent after subselective treatment (13%) than after superselective (6%) treatment. CONCLUSION: Superselective continuous arterial infusion chemotherapy may be suitable for local control of oral cavity tumors, with a low rate of recurrence.

Adult↗

PubMedDate not supplied

Intraosseous neurilemmoma of the mandible.

We report a rare case of intraosseous neurilemmoma of the mandible, with an emphasis on radiographic findings. The tumor, located mainly in the premolar region, presented as an expansive, unilocular, well-defined, radiolucent lesion on plain radiography. No dilatation of the mandibular canal was identified. MR imaging helped to identify the solid nature of the tumor. A biopsy was necessary to make the final diagnosis because of the relatively nonspecific nature of the lesion.

Adult↗

PubMedDate not supplied

Hemophiliac pseudotumor of the sacrum.

Although the pelvis is a common site for hemophiliac pseudotumors, involvement of the axial skeleton, such as the spine and sacrum, is rare. A rare case of hemophiliac pseudotumor arising from a healed fracture of the sacrum is reported. Findings of plain radiographs, CT, and radionuclide bone scan may simulate tumors of neural origin, but the heterogeneity of MRI is suggestive of hemophiliac pseudotumor.

Adult↗

PubMedDate not supplied

Musculoskeletal applications of MRI.

For many musculoskeletal applications, magnetic resonance imaging (MRI) has gone beyond the stage of a promising new modality to become the imaging technique of choice. Various applications of MRI in the musculoskeletal system are discussed. It is clear that MRI fills an important need and will be a major addition to the field of musculoskeletal diagnosis.

Bone Diseases↗

PubMedDate not supplied

Bilateral stress fracture of the navicular in a non-athlete.

Stress fracture of the navicular is usually seen in physically active individuals. A case of bilateral involvement in a non-athlete with multiple medical problems is reported. Diagnosis is often delayed because routine radiographs are usually normal at the onset of symptoms.

Adult↗

PubMedDate not supplied

MR anatomy of the substantia innominata and findings in Alzheimer disease: a preliminary report.

PURPOSE: To demonstrate normal MR anatomy of the substantia innominata and its changes in Alzheimer disease on MR imaging. METHODS: Using a 1.5-T superconductive MR unit, thickness of the substantia innominata was measured on coronal thin-section images obtained in 22 patients with Alzheimer disease and 14 age-matched control subjects. Comparison of these images with postmortem specimens of human brain was also performed. RESULTS: On T2-weighted images through the anterior commissure, the substantia innominata was clearly identified between the globus pallidus and the anterior perforated substance. In Alzheimer disease, thinning of the substantia innominata was more frequently observed than in the age-matched controls. CONCLUSION: Thin-section T2-weighted coronal MR images can demonstrate shrinkage of the substantia innominata, a finding that may aid in the diagnosis of Alzheimer disease.

Aged↗

PubMedDate not supplied

Diffuse mineralization of extraskeletal chondroma: a case report.

We report a case of extraskeletal chondroma involving diffuse hazy calcification of the chondroid matrix. T2-weighted magnetic resonance imaging showed a well-defined mass of low signal intensity, rather than of high signal intensity with a lobular configuration as typically seen in chondroma with hyaline cartilage. Knowledge of this type of mineralization may help in the diagnosis of extraskeletal chondroma.

Calcinosis↗

PubMedDate not supplied

Aggressive appearance of non-ossifying fibroma with pathologic fracture: a case report.

An 11-year-old boy presented with a lytic lesion in the proximal humeral metaphysis. In spite of an aggressively reactive appearance on plain radiography and MR imaging, this lesion proved to be a non-ossifying fibroma. Fracture of the cortical shell probably contributed to the relatively wide zone of transition and periosteal reaction on plain radiography and the reactive change on MR imaging.

Bone Neoplasms↗

PubMedDate not supplied

Single vertebral compression and involvement of the posterior elements in tuberculous spondylitis: observation on MR imaging.

To examine the atypical presentation of tuberculous spondylitis we evaluated seven cases seen in our hospitals during a five-year period (1989-1994) with procedures including MR imaging and CT scan. Three of the seven cases showed collapse of the single vertebral bodies with relatively spared disk spaces. Posterior elements were also involved on MR imaging in three cases, but the involvement of adjacent disks and vertebral bodies militated against metastases.

Adult↗