1,320 results match your criteria mimicking neoplastic

An unexpected intracerebral lesion - case report of a superinfected aspergillosis mimicking a brain metastasis.

BMC Infect Dis 2021 Jun 7;21(1):537. Epub 2021 Jun 7.

Department of Neurosurgery, University Hospital Zurich, University of Zurich, Frauenklinikstrasse 10, 8091, Zurich, Switzerland.

Background: Invasive aspergillosis of the central nervous system is a rare but increasingly prevalent disease. We present the unusual case of an immunosuppressed patient suffering from unexpected superinfected invasive aspergillosis with cerebral, pulmonal, and adrenal manifestations, mimicking a metastasized bronchial carcinoma. This report reveals the importance of including aspergillosis in the differential diagnosis of a cerebral mass lesion in the light of unspecific clinical findings. Read More

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A case of infective colitis due to Yersinia enterocolitica complicated by microliver abscesses mimicking multiple liver occult metastases: a case report.

BMC Infect Dis 2021 Jun 2;21(1):517. Epub 2021 Jun 2.

U.O.C di Medicina Interna con Stroke Care, Dipartimento di Promozione della Salute, Materno-Infantile, di Medicina Interna e Specialistica di Eccellenza "G. D'Alessandro", University of Palermo, Via del Vespro 129, 90127, Palermo, Italy.

Background: We report an unusual case of infective colitis by Yersinia enterocolitica complicated by microliver abscesses mimicking multiple liver metastases in a 79 yr old female without any risk factors for bacteriaemia by this pathogen.

Case Presentation: The patient was admitted to the Internal Medicine with Stroke Care ward of University Policlinico "P. Giaccone" in Palermo because of the appearance of diarrhoea. Read More

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Sporadic foveolar-type gastric adenoma with a raspberry-like appearance in Helicobacter pylori-naïve patients.

Virchows Arch 2021 May 27. Epub 2021 May 27.

Department of Gastroenterology, Faculty of Medicine, Shimane University, Izumo, Japan.

Sporadic foveolar-type gastric adenoma (FGA) has been described as an extremely rare polyp that is whitish and flatly elevated. However, we recently found that sporadic FGA with a raspberry-like appearance (FGA-RA) is not rare in Helicobacter pylori (H. pylori)-naïve gastric mucosa. Read More

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Organoid models of the tumor microenvironment and their applications.

J Cell Mol Med 2021 May 25. Epub 2021 May 25.

Department of Laboratory Medicine, Tiantai People's Hospital, Taizhou, China.

A small percentage of data obtained from animal/2D culture models can be translated to humans. Therefore, there is a need to using native tumour microenvironment mimicking models to improve preclinical screening and reduce this attrition rate. For this purpose, currently, the utilization of organoids is expanding. Read More

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Pseudoangiosarcomatous squamous cell carcinoma: first case report on penis.

Transl Androl Urol 2021 Apr;10(4):1803-1806

Laboratory Immunofluorescence and Electron Microscopy, University Hospital Universitário Presidente Dutra, São Luís, MA, Brazil.

Pseudoangiosarcomatous squamous cell carcinoma, also called pseudovascular, pseudoangiomatoid or adenoid pseudovascular carcinoma, is an uncommon and highly aggressive variant of squamous cell carcinoma. Histologically, it is characterized by proliferation of atypical keratinocytes with acantholysis and formation of pseudovascular spaces, forming anastomosed channels lined with neoplastic cells that invade the dermis. These cells are positive for cytokeratin and negative for vascular markers such as CD31 and CD34. Read More

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Hemorrhagic spinal melanotic schwannoma presenting as acute chest pain: A case report and literature review.

Surg Neurol Int 2021 14;12:164. Epub 2021 Apr 14.

Department of Neurosurgery, University of South Dakota Sanford School of Medicine, Sioux Falls, South Dakota, United States.

Background: Melanotic schwannoma (MS) is a rare variant of peripheral nerve sheath tumor. MS commonly arises along the spinal nerve sheath. Patients most often experience pain along the dermatome of the affected nerve root. Read More

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PET/CT Variants and Pitfalls in Head and Neck Cancers Including Thyroid Cancer.

Semin Nucl Med 2021 May 1. Epub 2021 May 1.

Department of Radiology, St Vincent's University Hospital, Elm Park, Dublin 4, Ireland; UCD - SVUH PET CT Research Centre, St Vincent's University Hospital, Elm Park, Dublin 4, Ireland.

PET/CT imaging is a dual-modality diagnostic technology that merges metabolic and structural imaging. There are several currently available radiotracers, but F-FDG is the most commonly utilized due to its widespread availability. F-FDG PET/CT is a cornerstone of head and neck squamous cell carcinoma imaging. Read More

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Salivary gland tissues and derived primary and metastatic neoplasms: unusual pitfalls in the work-up of sellar lesions. A systematic review.

J Endocrinol Invest 2021 May 3. Epub 2021 May 3.

Neuromed Institute, IRCCS, Pozzilli, IS, Italy.

Purpose: Salivary gland (SG) tissue and derived neoplasms may occur in the sellar region. As the current literature is mostly limited to case reports, the puzzling case of an inflammatory SG removed by transsphenoidal surgery (TS) and mimicking a prolactinoma prompted us to perform the first systematic review of these unusual conditions.

Methods: A systematic literature search was conducted according to the PRISMA guidelines. Read More

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Connectivity Map Analysis of a Single-Cell RNA-Sequencing -Derived Transcriptional Signature of mTOR Signaling.

Int J Mol Sci 2021 Apr 22;22(9). Epub 2021 Apr 22.

Division of Biostatistics and Bioinformatics, Department of Environmental and Public Health Sciences, University of Cincinnati College of Medicine, Cincinnati, OH 45267, USA.

In the connectivity map (CMap) approach to drug repositioning and development, transcriptional signature of disease is constructed by differential gene expression analysis between the diseased tissue or cells and the control. The negative correlation between the transcriptional disease signature and the transcriptional signature of the drug, or a bioactive compound, is assumed to indicate its ability to "reverse" the disease process. A major limitation of traditional CMaP analysis is the use of signatures derived from bulk disease tissues. Read More

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Limited Clinical and Diagnostic Utility of Circulating Tumor DNA Detection in Patients with Early-Stage Well-Differentiated Thyroid Cancer: Comparison with Benign Thyroid Nodules and Healthy Individuals.

Healthcare (Basel) 2021 Apr 1;9(4). Epub 2021 Apr 1.

Hallym University Medical Center, Hallym Institute of Translational Genomics and Bioinformatics, Anyang 14068, Gyeonggi-do, Korea.

Limited data are available on the diagnostic utility of circulating tumor DNA (ctDNA) in early-stage thyroid cancers for , , , and promoter mutations, which are known detectable markers for thyroid cancers. Here, we analyzed the above driver mutations in ctDNA and matched neoplastic tissues from patients with early-stage thyroid cancers in order to investigate diagnostic utility of circulating markers in distinguishing from other mimicking thyroid lesions and healthy individuals. In total, 73 matched neoplastic tissue and plasma samples [thyroid cancers (n = 62), benign thyroid disorders (n = 8), and parathyroid lesions (n = 3)] and 54 plasma samples from healthy individuals (as controls) were analyzed for , , , and promoter mutations using peptide nucleic acid clamp real-time PCR. Read More

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Subdural haematoma, the great imitator, mimicking acute spinal cord lesion.

BMJ Case Rep 2021 Apr 16;14(4). Epub 2021 Apr 16.

Department of Neurology, Matsushita Memorial Hospital, Moriguchi, Japan.

Acute non-traumatic paraparesis is usually caused by vascular, inflammatory or neoplastic myelopathies; however, it is sometimes caused by non-myelopathic pathologies, including polyradiculoneuropathies, myopathies, psychogenic aetiologies or parasagittal cortical pathologies. A 73-year-old woman reported weakness of the bilateral lower limbs and urinary incontinence. Together with the sensory level at the left T6 dermatome, we initially considered thoracic myelopathy as the most likely diagnosis. Read More

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Minor intron retention drives clonal hematopoietic disorders and diverse cancer predisposition.

Nat Genet 2021 05 12;53(5):707-718. Epub 2021 Apr 12.

Human Oncology and Pathogenesis Program, Memorial Sloan KetterAbsolute numbers of live mature hematopoietic cellsing Cancer Center, New York, NY, USA.

Most eukaryotes harbor two distinct pre-mRNA splicing machineries: the major spliceosome, which removes >99% of introns, and the minor spliceosome, which removes rare, evolutionarily conserved introns. Although hypothesized to serve important regulatory functions, physiologic roles of the minor spliceosome are not well understood. For example, the minor spliceosome component ZRSR2 is subject to recurrent, leukemia-associated mutations, yet functional connections among minor introns, hematopoiesis and cancers are unclear. Read More

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Metastatic prostate adenocarcinoma and high-grade appendiceal mucinous neoplasm mimicking acute appendicitis in a post-radiation therapy patient.

SAGE Open Med Case Rep 2021 28;9:2050313X20988421. Epub 2021 Jan 28.

Department of Pathology and Laboratory Medicine, Loma Linda University Medical Center, Loma Linda, CA, USA.

Prostate cancer is the most common visceral malignancy diagnosed in males. Surveillance for post-treatment neoplasms is very crucial. Here we report the first case of recurrent metastatic prostate cancer presenting as acute appendicitis in a background of a high-grade appendiceal mucinous neoplasm. Read More

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January 2021

Glycogen metabolism is dispensable for tumour progression in clear cell renal cell carcinoma.

Nat Metab 2021 03 23;3(3):327-336. Epub 2021 Mar 23.

Abramson Family Cancer Research Institute, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA.

Glycogen accumulation is a highly consistent, distinguishable characteristic of clear cell renal cell carcinoma (ccRCC). While elevated glycogen pools might be advantageous for ccRCC cells in nutrient-deprived microenvironments to sustain tumour viability, data supporting a biological role for glycogen in ccRCC are lacking. Here, we demonstrate that glycogen metabolism is not required for ccRCC proliferation in vitro nor xenograft tumour growth in vivo. Read More

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Needle in the heart: a rare case of cardiac tamponade caused by a migrated foreign body and mimicking ST segment elevation myocardial infarction.

BMC Cardiovasc Disord 2021 Mar 17;21(1):143. Epub 2021 Mar 17.

Heart and Vascular Center, Semmelweis University, Varosmajor Str. 68, 1122, Budapest, Hungary.

Background: Pericardial tamponade is a serious condition which may eventually lead to severe haemodynamic disturbances and cardiac arrest. It is most often caused by the accumulation of fluid inside the pericardium, as a result of different aetiological factors such as pericarditis, neoplastic diseases, lymphatic dysfunctions, or idiopathic pericardial disease. Pericardial tamponade can develop after cardiac surgical procedures or as a complication of myocardial infarction. Read More

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Small Cell-like Change in Central Zone Histology-A New Observation Mimicking Cribriform Intraductal Prostatic Adenocarcinoma.

Int J Surg Pathol 2021 Mar 17:10668969211003966. Epub 2021 Mar 17.

University of Miami Miller School of Medicine, Miami, FL, USA.

A small cell-like change in prostate has been described in high-grade prostatic intraepithelial neoplasia (PIN), intraductal prostatic adenocarcinoma, and invasive prostate cancer. It occurs when these processes have a cribriform architecture. To date, small cell-like change has not been described in benign glands. Read More

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Appendicitis mimicking the CT appearance of an appendiceal mucinous neoplasm.

J Radiol Case Rep 2020 Nov 30;14(11):26-38. Epub 2020 Nov 30.

Department of Diagnostic Radiology, Sengkang General Hospital Singapore, Singapore.

Occasionally, radiologically diagnosed acute appendicitis is found to harbour underlying appendiceal neoplasm on post-surgical histopathology. Conversely, a situation in which radiologically, the appendix demonstrates features consistent with an underlying tumour but post-operative pathology finds no evidence of neoplastic change is rare. We describe a case of a 50-year-old man who presented with a markedly dilated "mass-like" appendix with minimal inflammatory changes on a computed tomography scan. Read More

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November 2020

Large Fundic Gland Polyp Associated with Long-Term Proton Pump Inhibitor Administration Mimicking Gastric-Type Neoplasm.

Case Rep Gastroenterol 2021 Jan-Apr;15(1):123-130. Epub 2021 Feb 3.

Department of Gastroenterology, Toranomon Hospital, Tokyo, Japan.

A 57-year-old man with a 10-year history of proton pump inhibitor (PPI) use presented with multiple fundic gland polyps (FGPs) including one >20 mm, whitish, semi-pedunculated polyp. Black spots and cobblestone-like mucosa were also observed in the stomach upon endoscopy; therefore, the lesion was considered to result from long-term PPI administration. Endoscopically, we diagnosed this polyp as a neoplastic lesion with gastric phenotype rather than a non-neoplastic lesion. Read More

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February 2021

Mastocytosis in the skin accompanied by pseudo-Kaposi's sarcoma.

J Dermatol 2021 May 8;48(5):657-660. Epub 2021 Mar 8.

Spanish Reference Center of Mastocytosis, Instituto de Estudios de Mastocitosis de Castilla-La Mancha (CLMast), Hospital Virgen del Valle, Complejo Hospitalario de Toledo, Toledo, Spain.

Mastocytosis is a heterogeneous group of diseases characterized by abnormal proliferation of neoplastic mast cells in the skin and/or other extracutaneous tissues. Most patients with skin involvement can be subclassified into one of the three subtypes of cutaneous mastocytosis currently recognized by the World Health Organization (i.e. Read More

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Angioimmunoblastic T-cell lymphoma masquerading as granulomatous lymphadenitis: Fine needle aspiration cytology, clinical and radiology correlation.

Diagn Cytopathol 2021 Apr 25;49(4):555-558. Epub 2021 Feb 25.

Fine Needle Aspiration Biopsy Clinic, Department of Pathology, Molecular and Cell Based Medicine, Icahn School of Medicine at Mount Sinai Hospital, Mount Sinai Downtown Union Square Medical Center, New York, New York, USA.

Fine needle aspiration (FNA) is a minimally invasive technique used in the initial diagnosis of superficial lesions, including lymphadenopathy. Its benefit in lymph node pathology, however, is highly variable, especially in heterogeneous lymphoproliferative disorders like angioimmunoblastic T-cell lymphoma (AITL). AITL is an aggressive hematopoietic malignancy, histologically characterized by medium-sized neoplastic cells, high endothelial venule proliferations, and a heterogeneous hematolymphoid background. Read More

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Pseudocarcinomatous Mesothelioma: A Hitherto Unreported Presentation closely simulating primary lung cancer.

Int J Surg Pathol 2021 Feb 24:1066896921997559. Epub 2021 Feb 24.

390233Azienda Unità Sanitaria Locale della Romagna, Santa Maria delle Croci Hospital, Ravenna, Italy.

Malignant mesothelioma (MM) has a wide range of clinical, radiologic, and pathologic presentations, mimicking lung cancer or interstitial lung diseases when predominantly involving the lung parenchyma. The case herein refers to a 79-year-old man, active smoker without asbestos exposure, incidentally discovered to have a pulmonary nodule in the right upper lobe (1.5 cm). Read More

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February 2021

Metastatic Dissemination Mimicked in a Multicellular Transwell Assay.

Methods Mol Biol 2021 ;2235:181-190

Vascular Oncology and Metastasis, German Cancer Research Center Heidelberg (DKFZ-ZMBH Alliance), Heidelberg, Germany.

Tumor progression and metastasis are multistep processes that are critically dependent on the interaction of metastasizing tumor cells with other cells of the local microenvironment. Mimicking the single steps of the metastatic cascade in vitro is therefore challenging when investigating not only tumor cell behavior alone but also cellular crosstalk between different cell populations. In particular, the crosstalk of tumor cells with pericytes and endothelial cells when accessing the bloodstream is of great importance for successful intravasation and metastatic dissemination. Read More

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Pseudotumour presentation of pulmonary tuberculosis.

Ghana Med J 2020 Jun;54(2):126-130

Korle Bu Teaching Hospital, Department of Medicine and Therapeutics, Accra, Greater Accra, Ghana.

Pulmonary tuberculosis manifesting as a mass lesion, thus, mimicking a lung carcinoma is an unusual radiographic presentation of tuberculosis (TB). The common radiologic patterns and clinical presentations are well known and documented. We report two cases of pulmonary tuberculosis with a neoplastic appearance on chest imaging diagnosed histologically. Read More

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MicroRNAs Associated With a Good Prognosis of Acute Myeloid Leukemia and Their Effect on Macrophage Polarization.

Front Immunol 2020 15;11:582915. Epub 2021 Jan 15.

Department of Hematology, Iuliu Haţieganu University of Medicine and Pharmacy, Cluj-Napoca, Romania.

Acute myeloid leukemia (AML) is an aggressive myeloid malignancy with poor outcomes despite very intensive therapeutic approaches. For the majority of patients which are unfit and treated less intensively, the prognosis is even worse. There has been unspectacular progress in outcome improvement over the last decades and the development of new approaches is of tremendous interest. Read More

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Abdominopelvic Actinomycosis Mimicking a Malignant Ovarian Neoplasia: Case Report and Review of Literature.

Cureus 2020 Dec 20;12(12):e12182. Epub 2020 Dec 20.

Infectious Disease, Pontifical Bolivarian University, Medellín, COL.

Abdominal actinomycosis is a chronic, granulomatous, and indolent disease produced by ., a gram-positive filamentous bacillus, anaerobic, commensal in the oral cavity, gastrointestinal tract, and pelvic mucosa. Diagnosis is usually difficult and delayed due to its insidious presentation. Read More

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December 2020

Evaluation and Pathologic Classification of Choledochal Cysts: Clinicopathologic Analysis of 84 Cases From the West.

Am J Surg Pathol 2021 05;45(5):627-637

Departments of Pathology.

Choledochal cyst (CC) is believed to be a mostly Asian disorder. As a clinically defined entity, its pathologic correlates are poorly characterized. Eighty-four resected CCs from the West were reanalyzed. Read More

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Cyto-morphological and clinical approach to infections presenting with discharging sinuses mimicking malignancy.

Diagn Cytopathol 2020 Dec 17;48(12):1265-1272. Epub 2020 Aug 17.

Department of Pathology, Jawaharlal Institute of Postgraduate Medical Education and Research, Puducherry, India.

Introduction: Discharging sinuses is a form of chronic unhealed infection that can present at any site due to a variety of infectious organisms. These discharging sinuses may be associated with mass lesions and lymphadenopathy to mimic some neoplastic processes. Identifying these infections with accuracy and promptness is essential, as the treatment regimens are specific. Read More

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December 2020

High blood flow shear stress values are associated with circulating tumor cells cluster disaggregation in a multi-channel microfluidic device.

PLoS One 2021 14;16(1):e0245536. Epub 2021 Jan 14.

National Research Council (CNR), Institute of Electronic, Computer and Telecommunications (IEIIT), Genoa, Italy.

Metastasis represents a dynamic succession of events involving tumor cells which disseminate through the organism via the bloodstream. Circulating tumor cells (CTCs) can flow the bloodstream as single cells or as multicellular aggregates (clusters), which present a different potential to metastasize. The effects of the bloodstream-related physical constraints, such as hemodynamic wall shear stress (WSS), on CTC clusters are still unclear. Read More

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Unique imaging appearance of neurosarcoidosis as a solitary cystic mass with mural enhancement.

Surg Neurol Int 2020 22;11:463. Epub 2020 Dec 22.

Department of Radiology, University Texas Southwestern, Dallas, Texas, United States.

Background: Sarcoidosis is an idiopathic, granulomatous, and multi-system inflammatory disorder that can also involve the central nervous system in the form of meningeal, parenchymal, or cranial nerve involvement. Imaging findings can be non-specific and may overlap with other inflammatory, infectious and neoplastic processes, and posing diagnostic challenges. Parenchymal involvement in neurosarcoidosis (NS) predominantly manifests as either non-enhancing white matter lesions or as enhancing parenchymal granulomas. Read More

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December 2020

Enlarged accessory spleen after splenectomy mimicking a pancreas tumor.

Int J Surg Case Rep 2021 Jan 16;78:214-218. Epub 2020 Dec 16.

Department of Radiology, Ha Noi Medical University, Ha Noi, Viet Nam; Department of Radiology, Pham Ngoc Thach University of Medicine, Ho Chi Minh City, Viet Nam; Department of Radiology, Children's Hospital 2, Ho Chi Minh City, Viet Nam. Electronic address:

Introduction: An accessory spleen (AS), a common condition, is usually located in the hilar region of the spleen. ASs are not often large; however, after splenectomy, the initially inactive AS may become reactive and hypertrophic. Therefore, an AS can be misdiagnosed as a neoplastic tumor and removed unnecessarily. Read More

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January 2021