Siavash Rahimi

Dr. Siavash Rahimi

1. Histopathology, Brighton and Sussex University Hospitals NHS Trust, Brighton, UK
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orcid

Research Focus & Metrics

Academic Career Length

37Years (1990-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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1 December 2015 in European Journal of Cancer
Verified
Journal Article
Closed access
CSClare Schilling
Clare Schilling
SSSandro J. Stoeckli
Sandro J. Stoeckli
SHStephan K. Haerle
Stephan K. Haerle
MBMartina A. Broglie
Martina A. Broglie
GHGerhard F. Huber
Gerhard F. Huber
MMMark McGurk
Mark McGurk

1 January 2010 in Menopause
Verified
Journal Article
Closed access
ANDREA TINELLIANDREA TINELLI
ANDREA TINELLI
AMAntonio Malvasi
Antonio Malvasi
Siavash RahimiSiavash Rahimi
Siavash Rahimi
RNRoberto Negro
Roberto Negro
Daniele VergaraDaniele Vergara
Daniele Vergara
CCCarlo Cavallotti
Carlo Cavallotti
Genital prolapse is frequent in postmenopausal women; it describes the loss of support to the pelvic organs, resulting in a herniation of these into the vaginal channel. This problem affects 50% of parous women, and at least 50% of all women develop a mild form of genital prolapse after pregnancy. An extensive literature review from 1990 to 2008 was performed on prolapse etiology and its risk factors; analyzing the data, we reviewed the genetic and biological aspects, age-related prolapse, biological tissue modifications, surgical problems, pelvic musculature modifications, and neuropathy. Data suggested that aging, pelvic trauma, and surgery evoke tissue denervation and devascularization, anatomic alterations, and increased degradation of collagen; all of these may lead to a decrease in mechanical strength and predispose an individual to prolapse. It has been demonstrated that there is a reduction in protein content and estrogens in uterosacral ligaments, in the vagina, and in the parametrium of women with prolapse. This is a possible explanation for why many surgical procedures to correct prolapse fail and recurrences after surgical correction are frequent. Even if the etiology of pelvic prolapse is poorly defined and multifactorial, aging risk factors, such as biomechanical abnormalities in connective tissue composition, hormonal deficiency, and irregular tissue metabolism, are nonmodifiable and therefore largely stated in clinical practice. Regardless of future developments, based on the reported findings, prolapse therapy will be more influenced by genetics, biological pelvic changes, changes in tissue homeostasis, and topical hormones, rather than general pelvic corrective surgical anatomy.

26 September 2002 in International Journal of Cancer
Verified
Journal Article
Closed access
PDF file
Martini MaurizioMartini Maurizio
Martini Maurizio
MCMariavita Ciccarone
Mariavita Ciccarone
giorgia Garganesegiorgia Garganese
giorgia Garganese
CMClaudia Maggiore
Claudia Maggiore
AEAntonella Evangelista
Antonella Evangelista
Luigi Maria LaroccaLuigi Maria Larocca
Luigi Maria Larocca

3 March 2021 in Diagnostics
Verified
Journal Article
Open access
PDF file
IAIolia Akaev
Iolia Akaev
CYchit cheng YEOH
chit cheng YEOH
Siavash RahimiSiavash Rahimi
Siavash Rahimi
Endometrial stromal tumours (ESTs) are rare, intriguing uterine mesenchymal neoplasms with variegated histopathological, immunohistochemical and molecular characteristics. Morphologically, ESTs resemble endometrial stromal cells in the proliferative phase of the menstrual cycle. In 1966 Norris and Taylor classified ESTs into benign and malignant categories according to the mitotic count. In the most recent classification by the WHO (2020), ESTs have been divided into four categories: Endometrial Stromal Nodules (ESNs), Low-Grade Endometrial Stromal Sarcomas (LG-ESSs), High-Grade Endometrial Stromal Sarcomas (HG-ESSs) and Undifferentiated Uterine Sarcomas (UUSs). ESNs are clinically benign. LG-ESSs are tumours of low malignant potential, often with indolent clinical behaviour, with some cases presented with a late recurrence after hysterectomy. HG-ESSs are tumours of high malignant potential with more aggressive clinical outcome. UUSs show high-grade morphological features with very aggressive clinical behavior. With the advent of molecular techniques, the morphological classification of ESTs can be integrated with molecular findings in enhanced classification of these tumours. In the future, the morphological and immunohistochemical features correlated with molecular categorisation of ESTs, will become a robust means to plan therapeutic decisions, especially in recurrences and metastatic disease. In this review, we summarise the morphological, immunohistochemical and molecular features of ESTs with particular reference to the most recent molecular findings.

1 January 2009 in Gynecological Endocrinology
Verified
Journal Article
Closed access
ANDREA TINELLIANDREA TINELLI
ANDREA TINELLI
AMAntonio Malvasi
Antonio Malvasi
Siavash RahimiSiavash Rahimi
Siavash Rahimi
RNRoberto Negro
Roberto Negro
CCCarlo Cavallotti
Carlo Cavallotti
LMLiselotte Mettler
Liselotte Mettler
The myoma pseudocapsule is a structure formed surrounding the uterine fibroid, that in the uterus separates the myoma from normal tissue; because literature is lack of detailed information concerning myoma pseudocapsule, the author reviewed this important topic. An extensive literature review from 1980 to 2008 was performed on the myoma pseudocapsule, using: fibroid, myoma, myomectomy and reproductive outcome, as keywords. The fibroid removal should always be performed inside its pseudocapsule and with a careful stretching, to extract fibroid from the surrounding fibromuscular skeleton, breaking up the fibrous bridges; because the vascular network generally surrounds the myoma, detachment of the myoma occurring inside the pseudocapsule should cause less bleeding. The maintenance of myometrial integrity during myomectomy allows the facilitation of uterine healing and is of benefit for future reproductive outcome. The benefits of intracapsular myomectomy are evident, because it preserves myometrial integrity and allows for restoration of the uterine musculature. This correct myomectomy, if done by laparoscopy, confers significant advantages in less intraoperative blood loss, short duration of hospital stay, few therapeutic antibiotic administration and better future fertility.

4 June 2020 in Journal of Clinical Pathology
Verified
Journal Article
Closed access
PDF file
Siavash RahimiSiavash Rahimi
Siavash Rahimi
In early 1930, R. E. Shope paved the way for the recognition of human papillomavirus (HPV) as a causative agent of some types of cancers. In early 2000, the relationship between HPV and a subset of head and neck cancers, mostly located in the oropharynx, was discovered. In the last 20 years, we have made great progress in the recognition and treatment of HPV-positive head and neck cancers. However, there are still grey areas that leave room to subjective interpretation and need to be addressed. The majority of high risk (HR) HPV-positive oropharyngeal squamous cell carcinoma (OPSCC) shows a ‘basaloid’ morphology, and despite the variegated morphological spectrum of this malignancy, highlighted by some very recent publications, there is a lack of consensus on a universal morphological classification of HPV-OPSCC. The advent of immunohistochemistry with p16 ink4a (p16) protein made the diagnosis of HPV-related OPSCC more straightforward; currently patients with OPSCC are stratified in p16-positive and p16-negative. Although p16 is an excellent surrogate of HR HPV infection, it is not the direct demonstration of the presence of virus. At present, there is no univocal ‘gold-standard’ technique for the detection of oncogenic HPV infection. It is well known that HR HPV-related (OPSCC) bear significantly better survival outcome than HPV-negative cases. Consequently, the eighth edition of the American Joint Committee on Cancer and the Union for International Cancer Control now have separate staging systems for these two distinct malignancies. The present review discusses the salient features of HR HPV-driven OPSCC.