Diffusion-weighted Imaging of Retroperitoneal Malignant Peripheral Nerve Sheath Tumor in a Patient with Neurofibromatosis Type 1

Niwa, Tetsu; Aida, Noriko; Fujita, Kazutoshi; Kitagawa, Norihiko; Sato, Yukiko; Tanaka, Yukichi; Inoue, Tomio

doi:10.2463/mrms.7.49

Cited by 13 publications

(7 citation statements)

References 11 publications

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“…In this context, the independence of DWI from intravenous contrast media is especially advantageous. DWI sequences are increasingly used for the evaluation of other extracranial diseases and can be added to abdominal MRI protocols without relevant prolongation of the examination time (10)(11)(12)(13)(14). In the retroperitoneum DWI allowed the clear delineation of an inflammatory abdominal aortic aneurysm (19).…”

Section: Discussionmentioning

confidence: 99%

“…Diffusion-weighted imaging (DWI) is a radiation-free unenhanced MRI modality that has been applied for the detection of bowel inflammation in patients with chronic inflammatory bowel diseases (10,11), as well as for oncological retroperitoneal and abdominal applications (12)(13)(14). Therefore, we aimed to evaluate the application and findings of DWI in patients with treated and untreated RPF disease.…”

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confidence: 99%

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Diffusion-weighted MRI findings of treated and untreated retroperitoneal fibrosis

Kamper¹,

Brandt²,

Ekamp³

et al. 2014

Diagn Interv Radiol

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M agnetic resonance imaging (MRI) is a widely used diagnostic tool for breast imaging in daily practice, with its high sensitivity to detect primary, recurrent, and residual breast cancer. Breast MRI serves as a reliable problem-solving tool in case of inconclusive mammography and ultrasonography (US) findings. It can be used to monitor the results of neoadjuvant chemotherapy and it may also contribute to preoperative evaluation of known lesions. With increasing use of MRI, number of breast lesions visible only on MRI and need for MRI-guided breast biopsy have increased (1). Second-look US can also be used for re-evaluation of these lesions; because US-guided biopsy is an easier, cheaper, and faster method if these lesions are visible on second-look US. According to a recently published meta-analysis, lesion detection rates with second-look US are variable in the literature (22.6%-82.1%). Mass lesions and malignant lesions were more likely to be detected at second-look US; average detection rates were 66% for masses, 29% for non-mass-like enhancement (NME) (2, 3). However, focal or NME lesions, which are less detectable than masses on second-look US, require MRI-guided biopsy in the majority of cases. According to the MRI-guided biopsy series in the literature, approximately 25%-35% of these lesions are diagnosed as malignant (4-9).Within this context, the aim of the present study is to assess the effectiveness of MRI-guided 10 Gauge (G) vacuum-assisted breast biopsies (VABB) performed at our institution and to examine the relationship between lesion characteristics and histopathologic results. B R E A S T I MAG I N G O R I G I N A L A R T I C L E PURPOSEWe aimed to assess the effectiveness of magnetic resonance imaging (MRI)-guided vacuum-assisted breast biopsy (VABB), evaluate and compare the characteristics and histopathologic findings of lesions, and overview the follow-up results of benign lesions. METHODSMRI findings and histopathologic results of breast lesions biopsied by MRI-guided VABB between 2013 and 2016 were retrospectively analyzed. MRI findings closely related with malignancy were investigated in particular. Follow-up results of benign lesions were evaluated. RESULTSMRI-guided VABB was applied to 116 lesions of 112 women. Of the lesions, 75 (65%) were benign, while 41 (35%) were malignant. Segmental (94%), clustered (89%), and clustered ring (67%) nonmass-like enhancement patterns were found to be more related with malignancy. False-negative rate of MRI-guided VABB was 12%, underestimation rate was 21%. One of the 54 followed-up benign lesions had a malignant result. CONCLUSION MRI-guided VABB is a reliable method for the diagnosis of breast lesions that are positive only on MRI. Follow-up results show that cancer detection rate is low for radio-pathologically concordant lesions. Further multicenter studies with larger patient population are needed to elucidate these results.You may cite this article as: Taşkın F, Soyder A, Tanyeri A, Öztürk VS, Ünsal A. Lesion characteristics, histopathologic r...

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Section: Discussionmentioning

confidence: 99%

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confidence: 99%

Diffusion-weighted MRI findings of treated and untreated retroperitoneal fibrosis

Kamper¹,

Brandt²,

Ekamp³

et al. 2014

Diagn Interv Radiol

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“…DWI may also be useful because the reported ADCs of these benign tumors were higher than those of malignant tumors. 2,10,11 In young children, the diŠerential diagnosis for malignant tumors associated with AT/RT is primarily primitive neuroectodermal tumor (PNET). Although cases of AT/RT may have been misdiagnosed as PNET in the past, AT/RT can now be distinguished from PNET and other tumors by speciˆc immunohistochemical markers and by deletion and/or mutations involving the hSNF5/INI1 tumorsuppressor gene in chromosome band 22q11.2.…”

Section: Discussionmentioning

confidence: 99%

Diffusion-weighted Imaging of an Atypical Teratoid/rhabdoid Tumor of the Cervical Spine

et al. 2009

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Spinal atypical teratoid/rhabdoid tumor (AT/RT) is a rare, aggressive malignant neoplasm of the central nervous system usually seen in young children and infants. We present diŠusion-weighted imaging (DWI)ˆndings for an intradural extramedullary AT/RT in the cervical spine of a 6-year-old boy. High signal on DWI and low apparent diŠusion coe‹cients may represent high cellularity of the tumor. Theseˆndings indicated a highly malignant tumor.

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“…22 DWI has been applied for a wide range of oncological abdominal imaging and in distinguishing malignant sarcomas from benign tumours in patients with neurofibromatosis. [22][23][24] It has been used for the detection of inflammation in patients with Crohn's disease with decreased ADC values in inflamed bowel segments. 25 These examinations suggest restricted diffusion owing to malignant or inflammatory hypercellularity as a trigger for the resulting DWI differences, which is congruent with two preceding studies that applied DWI for the differentiation between retroperitoneal fibrosis and malignant retroperitoneal neoplasms.…”

Section: Discussionmentioning

confidence: 99%

Diffusion-weighted MRI in the follow-up of chronic periaortitis

Kamper

Haage

Brandt

et al. 2015

BJR

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Objective: To evaluate the usefulness of diffusion-weighted MRI (DWI) for the assessment of the intraindividual follow-up in patients with chronic periaortitis (CP) under medication. Methods: MRI data of 21 consecutive patients with newly diagnosed untreated disease were retrospectively examined before and after medical therapy, with a median follow-up of 16 weeks. DWI parameters [b800 signal, apparent diffusion coefficient (ADC) values] of the CP and psoas muscle were analysed together with the extent and contrast enhancement. Pre-and post-treatment laboratory inflammation markers were acquired parallel to each MR examination.

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Diffusion-weighted Imaging of Retroperitoneal Malignant Peripheral Nerve Sheath Tumor in a Patient with Neurofibromatosis Type 1

Cited by 13 publications

References 11 publications

Diffusion-weighted MRI findings of treated and untreated retroperitoneal fibrosis

Diffusion-weighted MRI findings of treated and untreated retroperitoneal fibrosis

Diffusion-weighted Imaging of an Atypical Teratoid/rhabdoid Tumor of the Cervical Spine

Diffusion-weighted MRI in the follow-up of chronic periaortitis

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