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[en] CT findings in 64 patients of nasopharyngeal cancer are analyzed retrospectively to evaluate the region of origin and the route of spread. The results are as follows: 1. The most frequently involved wall is lateral well (90%), followed by posterior wall (78%) and superior wall (58%). 2. There are invasion to parapharyngeal space (86%), retropharyngeal and prevertebral space (72%), carotid space (46%), and masticator space (18%) in that order. 3. Involved anatomic sites are Rosenmueller fossa (90%), torus tubarius (78%), E-tube orifice (68%), carotid sheath (46%), soft palate (50%), nasal cavity (36%), skull base (28%), prevertebral muscle (26%) and intracranial fossa (16%). 4. Direct extension to intracranial fossa is via sphenoid sinus (6/8), foramen lacerum (5/8), foramen ovale (4/8), and jugular foramen (4/8) in that order. 5. Invasion to prevertebral space leads to intraspinal extension (3/13). 6. Cervical lymph node metastasis of found in internal jugular (82%),spinal accessory (56%) and retropharyngeal chain (42%) in that order. 7. After radiation therapy, most frequent site of recurrence is posterior wall (10/14) followed by lateral wall (9/14), superior wall (5/14) and cervical lymph node (6/14), but the presence of recurrence is difficult to determine based on CT only
[en] Fifty-nine histologically proven cases of carcinoma of the larynx and hypopharynx were examined with CT for the staging before surgery or radiation therapy and the findings of primary disease and neck metastasis were analyzed. Local extension of the tumor can be easily evaluated with CT and findings of lymph node metastasis of neck were seen in 33 cases (79%) of all. Among cases of neck metastasis, peripheral contrast enhancement of the lymph nodes were demonstrated in 26 cases (79%).
[en] To obtain objective and comparable data for mechanical characteristics of self-expandable metallic stents widely used in the treatment of biliary obstruction. The stents tested were the 6 and 8 mm-band Hanaro spiral stent, Gianturco-Rosch Z stent, Wallstent, Ultraflex stent, and Memotherm stent. Each was subjected to three types of load:point, area, and circular. We analyzed their mechanical characteristics (resistance force, expansile force, and elasticity) according to these three types of stress. With regard to point loads, the Memotherm stent showed the highest resistance force and expansile force. The 8 mm-band Hanaro stent showed the lowest resistance force and the Gianturco-Rosch Z stent and Ultraflex stent showed lower expansile force. With regard to area loads, the Ultraflex stent showed the highest resistance force. The 6 mm-band Hanaro stent, Gianturco-Rosch Z stent, and Ultraflex stent showed higher expansile force. The 8 mm-band Hanaro stent showed the lowest value in both resistance force and expansile force. For circular loads, the Memotherm stent showed the highest resistance force and the Ultraflex stent and Wallstent showed lower value. Under all types of stress, the Hanaro stent and Memotherm stent were completely elastic, and the Ultraflex stent and Wallstent showed a wide gap between resistance force and expansile force. In clinical practice, awareness of the mechanical characteristics of each stent might help in choosing the one which is most suitable, according to type of biliary obstruction. =20
[en] To compare the MR imaging findings of ossifying fibroma with the histopathologic findings. In eight patients (M:F=1.7; age range, 1-25 years) with pathologically proven ossifying fibroma, plain film and MR images were retrospectively analyzed in terms of signal intensity, homogeneity and patterns of contrast enhancement. The MR imaging findings and histopathology were correlated. Using 1.0-T and 1.5-T MR machines, axial T1 and T2 images and gadolinium-enhanced axial and sagittal T1 images were obtained. In all cases, iso-signal intensity to muscle was observed on T1-weighted images, and high signal intensity on T2-weighted images. After intravenous injection of gadolinium-DTPA in seven cases, intense contrast enhancement was seen in all lesions, which were homogenous on T1, T2, and enhanced MR images, Moderate cellularity of fibrous tissue, with even distribution of osteoid and an absence of secondary changes such as hemorrhage or cystic change were revealed by pathologic examination. Ossifying fibroma shows strong enhancement and homogenous signal intensity on MR images. The homogeneity of the MR signal depends on the even distribution of osteoid and an absence of secondary changes such as hemorrhage or cystic change
[en] The purpose of this study is to evaluate the radiologic findings of intra-abdominal DSRCT. We reviewed six cases of pathologically proven DSRCT of the abdomen. Five of these patients were men and one was a woman; their average age was 26.8 years. We retrospectively analyzed CT (n=6) and MRI (n=4). In all patients, large relatively well defined lobulated mass was seen; this arose from the peritoneal surface, and its average size was 12.6 (range, 10-18) cm. After the administration of contrast material, the masses showed inhomogeneous enhancement, and in addition, the following features were seen; irregular internal septations (n=5), liver metastasis (n=1), cervical lymphadenopathy (n=1), hydronephrosis (n=1), small bowel obstruction (n=1), scrotal swelling (n=1) and collateral vessels by encased aorta and renal vein (n=1) were also seen. In young male patients with a large heterogeneous enhanced calcified abdominopelvic mass and findings of carcinomatosis on both CT and MR images, DSRCT should be included in the differential diagnosis. (author). 16 refs., 1 tab., 4 figs
[en] CT findings of histologically proven malignant tumors of maxillary sinus in 36 patients were retrospectively analyzed. A variety of malignant tumors were included; 27 cases of squamous cell carcinoma, 3 malignant lymphomas, 2 malignant melanomas, 2 rhabdomyosarcomas, and chondrosarcoma, adenoid cystic carcinoma, and malignant ameloblastoma. CT staging was T4 in 19 cases, T3 in 16 cases and T2 in 1 case. The most common involved area beyond maxillary antrum was nasal cavity (25 cases), followed by ethmoid sinus (20 cases), orbit (19 cases), infratemporal fossa (17 cases), check skin (13 cases), pterygopalatine fossa (10 cases), and nasopharynx (6 cases). Skeletal destruction was seen in medial wall of antrum (31 cases), posterior wall of antrum (25 cases), anterior wall of antrum (23 cases), roof of antrum (19 cases), lamina papyracea (6 cases), and lateral wall of orbit (5 cases) in that order of frequency. Lymph node metastases were found in 2 cases of malignant melanoma, 2 cases of malignant lymphoma, and chondrosarcoma, squamous cell carcinoma, and malignant ameloblastoma. Predilection site of lymph node involvement was submandibular (3 cases), internal jugular (2 cases), parotid (2 cases), and retropharyngeal node (1 case)
[en] To evaluate the MR imaging findings of chondroblastic osteosarcoma. We included 11 patients (8 men, 3 women, mean age of 19 years) with pathologically proven chondroblastic osteosarcoma and, as a control group, 20 patients with conventional osteosarcoma. We obtained pre- and post-enhanced MR images of all patients and retrospectively reviewed the signal intensity and enhancement pattern of tumors. MR images were correlated with histopathology. In chondroblastic osteosarcomas, the major portion ( > 75%) of the tumor showed low signal intensity on T1-weighted images and homogeneous high signal intensity on T2-weighted images, but did not show enhancement. The margin of the area showed a lobular pattern. Enhanced nodules(n=11) and strands(n=8) were seen in the nonenhanced portion. Histopathologically, the nonenhan-ced portion, nodules, and strands revealed a chondroid matrix, hypercellular area, and fibrovascular septa, respectively. Conventional osteosarcomas showed heterogeneous enhancement ; six showed a focal ( < 25%) nonenhanced area representing necrosis. Chondroblastic osteosarcoma showed characteristic MR imaging findings
[en] We retrospectively analyzed the clinical and CT manifestations of 12 patients with nonlymphomatous renal metastases from eight different sites. Primary sites were lung (2), liver (2), stomach (2), uterine cervix (2), pancreas (1), rectum (1), penis (1), and unknown primary site (1). In all patients, clinical symptoms and laboratory findings were nonspecific. Major CT findings of renal metastases were multiple, small, hypodense lesions concomitant with multiple organ involvement. Although there are few differential points between renal cell carcinoma and metastasis, the single most important differential point was the presence of mass lesion on location other than kidney and in such case, the lesion on kidney proved to be metastasis usually. In cases with remission of primary malignancy, biopsy of new renal lesion seemed to be indispensable
[en] Liposarcoma located in the scrotum is a very rare, and to our knowledge, only a few cases have been described in the radiologic literature. Clinically, scrotal liposarcoma manifests as a painless, slow-growing mass, which can be misdiagnosed as inguinal hernia, scrotal hydrocele or lipoma. Here, we present a case of scrotal liposarcoma. On CT and MRI, it manifested as a predominant fat-containing mass with heterogeneously enhancing soft tissue
[en] Percutaneous needle aspiration biopsy (PNAB) of suspected pulmonary malignancy is a simple, safe and practical method, so should be used earlier and more frequently to shorten the diagnostic interval. In Korea Cancer Center Hospital, 64 patients underwent PNAB with a diagnostic yield of 87.5%. 7 patients and a pneumothorax and in 3 patients developed transient hemoptysis. Of 58 malignant lung lesion, 56 were diagnosed correctly, with the identifiable specific cell type. Final results of 8 cases of no-malignant cell on PNAB reveal benign lesion of 4 cases, malignancy of 2 cases and loss to follow up of 2 cases. Most of the pulmonary masses were measured 2-4 cm (24 cases) or 4-6 cm (19 cases) in size, and distributed in upper lobes (36 cases) and peripheral area (45 cases), topographically.