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Bisdas S, Gurung J, Konstantinou G, Lehnert T, Herzog C, Balzer JO, Mack MG, Koh TS, Vogl TJ. Akuter Schlaganfall: Effekt der Arteriellen Input Funktion auf Perfusionwerte und Ischämievolumetrie in der Perfusions-CT. ROFO-FORTSCHR RONTG 2007. [DOI: 10.1055/s-2007-977212] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Eichler K, Mack MG, Zangos S, Lehnert T, Vogl TJ. Tumorkontrollrate und das „Läsion in Nekrosephänomen“ bei isolierten Lebermetastasen neuroendokriner Tumore. ROFO-FORTSCHR RONTG 2007. [DOI: 10.1055/s-2007-976938] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Mack MG, Maier B, Ploss C, Balzer JO, Frank J, Walcher F, Marzi I, Vogl TJ. CT assistierte perkutane osteosynthetische Versorgung instabiler ileosakraler Frakturen bei Traumapatienten. ROFO-FORTSCHR RONTG 2007. [DOI: 10.1055/s-2007-976861] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Vogl TJ, Mack MG, Bisdas S. Differentialdiagnosen submuköser Raumforderung. ROFO-FORTSCHR RONTG 2007. [DOI: 10.1055/s-2007-976623] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Mack MG, Rieger J, Baghi M, Balzer JO, Knecht R, Hambek M, Bisdas S, Vogl TJ. Wertigkeit der hochauflösenden USPIO (Sinerem®) verstärkten MRT bei der Diagnostik von Halslymphknotenmetastasen bei Patienten mit Karzinomen der Kopf-Halsregion. ROFO-FORTSCHR RONTG 2007. [DOI: 10.1055/s-2007-976815] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Mack MG, Maier B, Ploss C, Balzer JO, Frank J, Marzi I, Eichler K, Reichel P, Vogl TJ. CT-assistierte Platzierung von Pedikelschrauben über einen Führungsdraht bei Patienten mit instabilen Frakturen der Brustwirbelsäule. ROFO-FORTSCHR RONTG 2007. [DOI: 10.1055/s-2007-976860] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Bisdas S, Baghi M, Chambron-Pinho N, Smolarcz A, Knecht R, Herzog C, Mack MG, Koh TS, Vogl TJ. Perfusions-CT bei Kopfhalstumoren: Quantitative Perfusion- und Permeabilitätsmessungen bei Oropharynxkarzinomen, Oropharynxrezidiv und Lymphknotenmetastasen. ROFO-FORTSCHR RONTG 2007. [DOI: 10.1055/s-2007-976812] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Eichler K, Zangos S, Mack MG, Balzer JO, Thalhammer A, Vogl TJ. Ergebnisse der lokalen transartriellen Chemoembolisation (TACE) in einer Phase II Studie mit Gemcitabine bei inoperablen Lebermetastasen eines Mammakarzinoms. ROFO-FORTSCHR RONTG 2007. [DOI: 10.1055/s-2007-976834] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Zangos S, Eichler K, Mack MG, Sadighi C, Lehnert T, Herzog C, Vogl TJ. MR-kompatibles Assistenzsystem für Punktionen im Hochfeld-MRT: Technik und erste Ergebnisse. ROFO-FORTSCHR RONTG 2007. [DOI: 10.1055/s-2007-977065] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Lehnert T, Mundackatharappel S, Berg-Schlosser F, Balzer J, Mack MG, Etou A, Vogl TJ. CT-gesteuerte intradiskale und intraforaminale Ozon/Sauerstoffinjektion: Eine kausale Therapie des bandscheibenprolapsassoziierten Schmerzsyndroms an 80 Patienten. ROFO-FORTSCHR RONTG 2007. [DOI: 10.1055/s-2007-976866] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Mack MG, Eichler K, Lehnert T, Zangos S, Balzer JO, Thiel A, Vogl TJ. 13-Jahre Langzeiterfahrungen mit der MR-gesteuerten LITT bei Lebermetastasen eines kolorektalen Karzinoms. ROFO-FORTSCHR RONTG 2007. [DOI: 10.1055/s-2007-976934] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Lehnert T, Wohlers J, Streng W, Kahn F, Korkusuz H, Coenegrachts K, Vogl TJ, Mack MG. Bildqualitativer Vergleich zwischen einem DR-System und einem CR-System bei stetiger Dosisreduktion und zunehmender Vorfilterung. ROFO-FORTSCHR RONTG 2007. [DOI: 10.1055/s-2007-977180] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Mack MG, Balzer JO, Bisdas S, Vogl TJ. Bildgebung des Schläfenbeins: Trauma. ROFO-FORTSCHR RONTG 2007. [DOI: 10.1055/s-2007-976742] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Mack MG, Bausch A, Frank J, Balzer JO, Marzi I, Lehnert T, Vogl TJ. Intraindividueller Vergleich der hochauflösenden MRT des Handgelenkes mit der Arthroskopie. ROFO-FORTSCHR RONTG 2007. [DOI: 10.1055/s-2007-977030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Lehnert T, Eichler K, Zangos S, Thalhammer A, Balzer JO, Mack MG, Vogl TJ. Hepatocyte growth factor (HGF) – Quantitative Evaluation des Zytokins HGF vor Intervention: Ergebnisse einer Langzeitstudie über die prognostische Aussagekraft für die Leberregeneration. ROFO-FORTSCHR RONTG 2007. [DOI: 10.1055/s-2007-976875] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Mack MG, Eichler K, Lehnert T, Reichel P, Khan F, Müller C, Heller M, Khan V, Vogl TJ. Langzeiterfahrungen mit der MR-gesteuerte LITT bei Lebermetastasen eines Mammakarzinoms. ROFO-FORTSCHR RONTG 2007. [DOI: 10.1055/s-2007-976935] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Straub R, Mack MG, Jacobi V, Proschek D, Vogl TJ. [Magnetic resonance imaging in orthopaedic medicine]. DER ORTHOPADE 2006; 35:626-31. [PMID: 16568256 DOI: 10.1007/s00132-006-0948-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
Magnetic resonance imaging (MRI) is an established diagnostic tool in orthopaedics. Superior soft tissue contrast, lack of ionised radiation and free slice orientation are the key points for optimal evaluation of joint structures, muscles and ligaments. Application of contrast agents improves the detection of inflammation and tumour tissue. However, measuring and interpretation of magnetic resonance imaging is a challenge both for orthopaedists and radiologists. Basic requirements for good diagnosis are clinical findings, plain radiographs and a clear indication. This report provides information about the method of magnetic resonance imaging, artefacts, indications, risks and drawbacks as well as limitations of this method that necessitate alternative imaging modalities.
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Lehnert T, Mundackatharappel S, Schwarz W, Bisdas S, Wetter A, Herzog C, Balzer JO, Mack MG, Vogl TJ. [Nucleolysis in the herniated disk]. Radiologe 2006; 46:513-9. [PMID: 16786388 DOI: 10.1007/s00117-006-1379-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
Back pain associated with a herniated disk has become an important and increasing general health problem in Germany and other industrialized countries. After all methods of conservative treatment have been exhausted, nucleolysis may be a minimally invasive alternative to surgery. In nucleolysis, chondrolytic substances or other substances, which reduce the pressure within the disk by other means, are injected into the nucleus pulposus under CT guidance. Among various substances, which have been employed for nucleolysis, an ozone-oxygen mixture appears to be very promising. The water-binding capacity of ozone results in a reduction of pain for several months. Moreover, it has an anti-inflammatory effect and results in an increase of perfusion. Ozone is converted into pure oxygen in the body and has a low allergic potential. Recent minimally invasive therapeutic methods such as percutaneous nucleotomy or laser treatment do not result in superior results compared with nucleolysis.
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Proschek D, Proschek P, Hochmuth K, Balzer JO, Mack MG, Vogl TJ. False aneurysm of the left femoral artery and thrombosis of the left femoral vein after total hip arthroplasty. Arch Orthop Trauma Surg 2006; 126:493-7. [PMID: 16810552 DOI: 10.1007/s00402-006-0166-x] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/06/2006] [Indexed: 02/09/2023]
Abstract
We report a 75-year-old male patient with an aneurysm of the left femoral artery after cemented total hip arthroplasty. Two months after the operation, the patient showed a spherical resistance and pain in the left groin. Examination showed a big false aneurysm of the left femoral artery. After resection of the aneurysm, an endovascular stent graft vessel prosthesis was implanted. The aneurysm originated from a punctual lesion of the artery caused by a screw. Since the first description of vessel lesions in orthopaedic surgery in 1964, a total of 24 cases of aneurysm in hip surgery have been described. Therefore, a review of literature tries to explain causes and mechanisms of vessel injuries in hip surgery and the possibilities of repair.
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Lehnert T, Wohlers J, Streng W, Manegold K, Wetter A, Jacobi V, Mack MG, Vogl TJ. [Variation in X-ray dose quantity using an amorphous selenium based flat-panel detector -- a study on the dose reduction rate up to the limit of diagnostical utilization]. ROFO-FORTSCHR RONTG 2006; 178:278-86. [PMID: 16508834 DOI: 10.1055/s-2006-926536] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
PURPOSE To evaluate the diagnostic quality and minimum required dose to obtain acceptable images for diagnostic purposes in the field of musculoskeletal radiology. MATERIALS AND METHODS A critical comparison of the image quality produced by a novel flat panel detector and the conventional screen/film system using a contrast-detail phantom was performed in phase I. Images from both systems were obtained with the same dose and displayed with similar contrast and density. In phase II images of significant anatomical structures in cadaver extremities obtained using the digital detector system and the standard film/screen system were critically evaluated. After a successive reduction in the X-ray dose for 84 patients in phase III, eight independent radiologists compared the image quality of the screen/film system to that of the novel flat panel detector. RESULTS Phases I and II revealed a difference in the image quality achieved by the standard screen/film system and the digital detector system to the advantage of the digital detector system. In 77 of 84 patients (91.7 %), phase III showed equal image quality after a 50 % reduction in the X-ray dose. In 3 cases (3.6 %) the image quality and the level of contrast were better. No unified statement could be made for 4 patients (4.7 %). CONCLUSION Digital imaging of skeletal disorders using the novel flat panel detector makes it possible to reduce the X-ray dose by 50 % with equal or even better image quality.
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Zangos S, Eichler K, Wetter A, Lehnert T, Hammerstingl R, Diebold T, Reichel P, Herzog C, Hansmann ML, Mack MG, Vogl TJ. MR-guided biopsies of lesions in the retroperitoneal space: technique and results. Eur Radiol 2005; 16:307-12. [PMID: 16059677 DOI: 10.1007/s00330-005-2870-2] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2005] [Revised: 06/06/2005] [Accepted: 07/04/2005] [Indexed: 10/25/2022]
Abstract
The purpose of this study was to evaluate the safety and precision of MRI-guided biopsies of retroperitoneal space-occupying tumors in an open low-field system. In 30 patients with indistinct retroperitoneal tumors [paraaortic lesion (n=20), kidney (n=2), suprarenal gland (n=3) and pancreas (n=5)] MR-guided biopsies were performed using a low-field system (0.2 T, Magnetom Concerto, Siemens, Germany). For the monitoring of the biopsies T1-weighted FLASH sequences (TR/TE=160/5 ms; 90 degrees ) were used in all patients and modified FLASH sequences (TR/TE=160/13 ms; 90 degrees ) in ten patients. After positioning of the needle in the tumors 114 biopsy specimens were acquired in coaxial technique with 16-gauge cutting needles (Somatex, Germany). The biopsies were successfully performed in all patients without vascular or organ injuries. The visualization of the aortic blood flow with MRI facilitated the biopsy procedures of paraaortic lesions. The size of the lesions ranged from 1.6 to 7.5 cm. The median distance of the biopsy access path was 10.4 cm. Adequate specimens were obtained in 28 cases (93.3%) resulting in a correct histological classification of 27 lesions (90%). In conclusion, MR-guided biopsies of retroperitoneal lesions using an open low-field system can be performed safely and accurately and is an alternative to CT-guided biopsies.
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Mack MG, Eichler K, Straub R, Lehnert T, Zangos S, Vogl TJ. Long-term results of MR-guided laser induced thermotherapy (LITT) of colorectal carcinoma metastases in the liver. J Clin Oncol 2005. [DOI: 10.1200/jco.2005.23.16_suppl.3610] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Vogl TJ, Straub R, Zangos S, Mack MG, Eichler K. MR-guided laser-induced thermotherapy (LITT) of liver tumours: experimental and clinical data. Int J Hyperthermia 2005; 20:713-24. [PMID: 15675667 DOI: 10.1080/02656730400007212] [Citation(s) in RCA: 84] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
MR-guided laser-induced interstitial thermotherapy (LITT) is a percutaneous, minimally invasive treatment modality for treating liver lesions/metastases, soft tissue tumours and musculoskeletal lesions. In this group, MR-guided LITT is currently performed under local anaesthesia on an out-patient basis with a specially designed saline-cooled laser application system. Nd:YAG laser (1064 nm wave length) was used for tumour ablation. Magnetic resonance imaging (MRI) using both open and closed MR units has proven clinically effective in validating the exact positioning of optical fibres. It also allows for real time-monitoring of thermal effects and the evaluation of treatment-induced coagulation necrosis. In liver tumours, percutaneous MR-guided LITT achieves a local tumour control rate of 98.7% at 3 months post-therapy and 97.3% at 6 months with metastases smaller than 5 cm in diameter. The mean survival rate for 1259 patients with 3440 metastases treated with 14 694 laser applications at the institute (calculated with the Kaplan-Meier method) was 4.4 years (95% confidence interval: 4.1-4.8 years) and median survival was 3.00 years. No statistically significant difference in survival rates was observed in patients with liver metastases from colorectal cancer vs metastases from other primary tumours. The rate of clinically relevant side effects and complications requiring secondary treatment was 2.2%. The clinical use of MR guided LITT (size < 5 cm, number < 5) is justified in patients with liver metastases of colorectal and/or breast cancers if the inclusion criteria are carefully observed. Further indications for MR guided LITT include recurrent cancer lesions in the head and neck, lung metastases and bone and soft tissue lesions.
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Maataoui A, Qian J, Mack MG, Straub R, Oppermann E, Khan MF, Knappe V, Vogl TJ. Laserinduzierte interstitielle Thermotherapie (LITT) von Lebermetastasen unterschiedlicher Größe im Kleintiermodell. ROFO-FORTSCHR RONTG 2005; 177:405-10. [PMID: 15719304 DOI: 10.1055/s-2004-813915] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
PURPOSE To assess the effect of laser-induced thermotherapy (LITT) on liver metastases of various size from colon carcinoma in an animal model. MATERIALS AND METHODS Liver metastases were implanted in 20 Wistar Albino Glaxo (WAG) rats by subcapsular injection of cells from a colorectal strain (CC531) (day 0). The animals were divided into two groups with regard to the measured tumor size of 0.05 - 0.06 cm (3) (group A) and 0.10 - 0.12 cm (3) (group B). On day 14 after laparotomy, the tumors were exposed to 1064 nm Nd:YAG laser light at 2 watts for 5 minutes after intratumoral placement of the laser applicator set. The tumor volumes before (V1, at day 13) and after treatment (V2, at day 28) were determined by MRI and the mean tumor growth ratio (V2/V1) was calculated. RESULTS The mean tumor volumes V1 and V2 were 0.05 +/- 0.003 cm (3) and 0.23 +/- 0.016 cm (3) in group A, and 0.11 +/- 0.006 cm (3) and 0.68 +/- 0.037 cm (3) in group B. The mean tumor growth ratio (V2/V1) was 4.31 +/- 0.19 in group A and 6.11 +/- 0.14 in group B. The mean volume of the induced necrosis (0.15 +/- 0.01 cm (3)) was the same for both groups ( p > 0.05). Compared to group B, liver metastases of group A showed a significant slower tumor growth velocity (paired t-test, p < 0.0001). CONCLUSION The interventional treatment of large hepatic tumors with LITT leads to faster tumor growth compared to smaller lesions.
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Zangos S, Kissler S, Mueller A, Siebzehnruebl E, Kaufmann M, Hamscho N, Grünwald F, Eichler K, Herzog C, Marquardt F, Peters J, Jacobi V, Mack MG, Vogl TJ. MRT der uterinen Adenomyose bei infertilen Patientinnen: Ergebnisse und klinische Rückschlüsse. ROFO-FORTSCHR RONTG 2004; 176:1641-7. [PMID: 15497083 DOI: 10.1055/s-2004-813644] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
PURPOSE To evaluate the clinical value of magnetic resonance imaging (MRI) of the uterus and the pelvis in infertile female with symptomatic endometriosis for the assessment of uterine morphology and function. MATERIALS AND METHODS Forty-one infertile women (mean age: 33.2 years) with symptomatic endometriosis documented by laparoscopy were evaluated with high-field MRI (Sonata, Siemens) using T2- and T1-weighted sequences. In addition, the patients underwent hysterosalpingoscintigraphy (HSSG) for evaluation of the uterotubal transport capacity. Pathologic findings of the uterine junction zone were correlated with the laparoscopic results, clinical symptoms and uterotubal transport capacity. RESULTS Adenomyosis was diagnosed on T2-weigthed MR-images in 35 (85.4 %) patients (focal adenomatosis in 26 patients and diffuse adenomatosis in 9). Patients showing signs of adenomyosis tended to be older than patients without adenomyosis (mean age 34.1 years vs. 30.1 years) and showed a longer history of symptomatic endometriosis. A positive transport capacity in HSSG was observed in 73.1 % (19/26) of the patients with focal adenomyosis and in only 22.2 % (2/9) of patients with diffuse adenomyosis. In 83.3 % (5/6) of the patients without signs of adenomyosis, a positive uterotubal transport was documented. CONCLUSION MRI of the uterus is a helpful diagnostic tool for the diagnosis of adenomyosis and for planning further therapies. Patients with the diagnosis of adenomyosis showed a reduced uterotubal transport capacity that depended on the severity of adenomyotic changes and might be a possible cause of infertility.
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