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KU Leuven (2)


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dissertation (2)


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English (2)


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2022 (2)

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Dissertation
Added value of diffusion-weighted imaging and delayed Gadolinium-enhanced MRI for staging of FIGO IB-IIB cervical cancer treated with neo-adjuvant chemotherapy

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Abstract

Objectives: In cervical cancers up to FIGO (International Federation of Gynaecology and Obstetrics) stage IIB treated by neoadjuvant chemotherapy (NACT) followed by radical surgical resection, we aimed to analyse the diagnostic utility of post-NACT multiparametric MRI, firstly for local tumour (re)staging and operability assessment, secondly for pelvic and para-aortic lymph node staging. Multiparametric MRI includes T2-WI, diffusion weighted imaging (DWI), and ultrastructural delayed post-contrast MRI (UDPC-MRI). Methods: In a university setting, we retrospectively included 42 patients with pathology proven uterine cervical cancer up to FIGO stage IIB treated with NACT. Response assessment of primary tumour and detection of lymph node metastasis was scored multiple times by one expert radiologist in a blinded fashion, taking into account more and more MRI sequences; i.e. comparing consecutively T2-WI alone, combined T2/DWI-MRI, and multiparametric MRI including T2/DWI-MRI with UDPC-MRI. MRI assessment was correlated with the pathological data of radical resection. Results: Overall, the best diagnostic results (sensitivity, specificity and accuracy) with assessment of vaginal invasion, parametrial invasion, and pelvic nodal metastasis, were obtained in the third multiparametric reading session. Correct FIGO stage assignment improved significantly. Conclusions: To our knowledge, this is the first study to indicate that adding UDPC to T2-WI and DWI improves diagnostic performance (by facilitating residual tumour delineation) for locoregional staging of cervical cancer after NACT prior to surgery. Better detection of locoregional tumour extent – particularly tumour viability and residual parametrial invasion - and nodal metastasis after NACT by UDPC-MRI may improve therapeutic decision making towards operability.

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Dissertation
Diffusion-weighted magnetic resonance imaging in restaging of pancreatic ductal adenocarcinoma after neoadjuvant therapy: a pilot study

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Purpose To investigate the utility of diffusion-weighted magnetic resonance imaging (DWI-MRI) to predict operability (R-status) and survival of patients with borderline resectable (BR) and locally advanced (LA) pancreatic ductal adenocarcinoma (PDAC) after neoadjuvant chemotherapy (NACT). Materials and methods Two readers retrospectively analysed 25 consecutive patients with BR/LA-PDAC who underwent restaging DW-MRI after NACT prior to surgery. Interreader agreement was assessed using intraclass correlation coefficient (ICC). Whole tumor apparent diffusion coefficient (ADC) was correlated with 1-year overall survival with a cut-off value determined by receiver-operator characteristic (ROC) curve. Additionally for each vessel circumferential extent-, change- and length of contact, stenosis, contour irregularity/attraction, perivascular ADC value, qualitative degree- and circumferential extent of diffusion restriction were determined. Chi-Square test or regression analysis was performed to determine correlation between these features and the need for vascular resection. Results Interobserver agreement for whole-tumor ADC was moderate (0.650). Post-NACT whole tumor ADC was significantly higher (p=0.034) for patients with 1 year overall survival post-surgery with cut-off value of 1.278*10-³ mm²/s and area under the curve (AUC) of 0.822. No arterial resections were performed, 10/21 operable patients required venous resection. Circumferential extent of soft tissue contact, stenosis, contour irregularity/attraction, change in vascular contact and perivascular ADC value were associated (p<0,05) with a need for venous resection, of these perivascular ADC value less than 1,480*10-3 mm³/s was most accurate (AUC 0.815). Conclusion Post-NACT tumor mean ADC was predictive for postoperative survival. Addition of DW-MRI features may result in more accurate preoperative restaging of PDAC patients after NACT.

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