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Biomedical subjects

O Rieker

Publications and source records attributed to O Rieker.

27 records · Page 2Linked to original sources
PubMed1995

[CT and MRI in malignant peripheral neuroectodermal tumors].

To evaluate the diagnostic accuracy of CT and MRI in the diagnosis of malignant peripheral neuroectodermal tumors (MPNT), the imaging data of nine patients with immunehistochemically proven MPNT were retrospectively analyzed. The average age was 24 years (ranging from 5 to 63 years). MRI and CT of all patients showed large tumors with direct infiltration of the surrounding structures. Intratumoral calcifications were not identified. All tumors showed equal to less high signal intensity in T1- and high signal intensity in T2-weighted images. Because of its high soft-tissue contrast, MRI is the most capable imaging modality in the diagnosis and therapy-monitoring in these tumors.

Adolescent↗
PubMed1995

[Spondylogenic psoas abscess: long-term follow-up after percutaneous drainage].

Iliopsoas abscesses originating from bacterial lumbar spondylodiscitis were successfully treated by CT-guided percutaneous abscess drainage, antibiotics, and immobilization in two patients. Vertebral fusion of the affected segments was observed in both patients in the follow-up period (1 and 6 years, respectively). Percutaneous abscess drainage can replace surgery for iliopsoas abscesses following vertebral osteomyelitis.

Discitis↗
PubMed1994

[MR tomography and bone marrow scintigraphy in the screening of skeletal metastases in patients with breast carcinoma].

46 patients with recently diagnosed carcinoma of the breast were included in a prospective comparative study of MRI and bone marrow scintigraphy. The aim of the study was to compare these procedures within a histologically unified patient collective. It was shown that MRI was superior to bone marrow scintigraphy in respect of sensitivity (92% vs 58%) and specificity (97% vs. 85%), although only about three quarters of the marrow spaces are examined by MRI screening. Bone marrow scintigraphy suffered particularly from a relatively high number of false positive findings (haemangiomas, degenerative changes). MRI remains the method of choice for investigating the bone marrow.

Bone Marrow↗
PubMed1994

Disseminated bone marrow metastases from primary breast cancer: detection and follow-up by radioimmune bone marrow scintigraphy.

Bone scintigraphy of a 40-yr-old patient suffering from primary breast cancer suggested the possibility of diffuse metastases. Bone marrow scintigraphy using 99mTc-labeled monoclonal antibodies (BW 250/183) demonstrated diffuse destruction of bone marrow due to metastatic disease and consecutive bone marrow extension. Bone marrow scintigraphy was highly sensitive in detecting progression of disease in this asymptomatic patient.

Adult↗
PubMed1994

Cerebral blood flow in Sneddon syndrome.

Sneddon syndrome is defined as a clinical entity consisting of livedo racemosa generalisata (LRG) and cerebrovascular lesions, which often lead to physical and mental handicaps. Four patients with LRG and the suspected diagnosis of Sneddon syndrome had HMPAO-SPECT studies. The patients underwent CT and/or MR brain imaging and three patients had Duplex sonography of the cerebral arteries (TCD). Brain SPECT was abnormal in all patients, whereas CT/MRI revealed a cerebral lesion in only one patient and all TCD studies were normal. HMPAO-SPECT is valuable in detecting disturbed regional cerebral blood flow before irreversible ischemic insults occur, thus allowing the diagnosis of Sneddon syndrome at an early stage.

Adult↗
PubMed1993

[HMPAO-SPECT in Alzheimer-type dementia and major depression with memory disorders].

The aim of the present study was to see whether HMPAO-SPECT may contribute to the differentiation between dementia of the Alzheimer type (DAT) and major depression (MD). The results in 77 patients with memory impairment were evaluated. 48 patients suffered from DAT and 29 from MD. Initially, the defects in SPECT imaging were attributed to a cerebral region and the degree of decrease was evaluated (-1/-2/-3). Thereafter, the results were classified by 7 categories. In some of these categories an accumulation of cases of either DAT or MD was found. 35% of the patients suffering from DAT had bilateral defects with distinct (> -1) parietal/parietotemporal hypoperfusions, but no patient with MD showed this perfusion pattern. 62% of the patients with MD had unilateral defects but only 31% of the patients with DAT. The present study demonstrates that only 35% of all patients suffering from DAT show a perfusion pattern, thought earlier as "pathognomonic" for this disease. This perfusion pattern--if it exists--may be used as a safe criterion to exclude MD. Beyond that no clearcut ("specific") perfusion pattern may be recognized but unilateral defects point to MD.

Aged↗
PubMed1993

[Sonography of acute appendicitis. A 5-year prospective study of 2074 patients. 2].

High-resolution real-time ultrasound (US) with a 5 MHz transducer has proved to be an important method in the diagnosis of acute appendicitis. In a prospective study we examined 2074 unselected patients with suspected appendicitis to assess the diagnostic and epidemiological value of US. According to the clinical diagnosis females aged 10 to 30 represented the majority of suspected cases. Appendicitis was most often proved in male patients aged 15-30 years. The prevalence of acute appendicitis in childhood is lower (7%) than in elderly patients (33%). US enables the diagnosis of acute appendicitis with a sensitivity of 91%, a specificity of 98% and an overall accuracy of 97%. For differential diagnosis US demonstrates other diseases that mimic acute appendicitis. Thus it is possible to reduce the negative appendectomy rate particularly in children by revealing mesenteric lymphadenitis or terminal ileitis and in young women by directing attention to gynecological diseases.

Acute Disease↗
PubMed1992

[Ultrasonic diagnosis of goiter of the tongue base].

Lingual goitre was found in two adolescents suffering from mild dysphagia. Since there were typical changes in lingual sonomorphology, sonographic evaluation was easy to perform. Lingual thyroid was less echogenic than normal thyroid tissue. Ultrasound may support the decision of the initial treatment and is useful to guide further therapy.

Adolescent↗