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Jain S, Harikrishan B. Cervical Sympathetic Chain Schwannoma-Our Experience. Indian J Otolaryngol Head Neck Surg 2022; 74:2440-2444. [PMID: 36452622 PMCID: PMC9701990 DOI: 10.1007/s12070-020-02199-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2020] [Accepted: 10/03/2020] [Indexed: 10/23/2022] Open
Abstract
Tumours arising from the parapharyngeal space are uncommon. The most common tumour arising primarily from this region is a neurogenic tumour, especially Schwannoma. The most common site of origin of a Schwannoma in parapharyngeal space is Vagus nerve. Cervical sympathetic chain (CSC) schwannomas are extremely rare. Here, we discuss a case of a 30-year old female with cervical sympathetic chain schwannoma, the clinical presentation, diagnosis and management.
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Schaefer IM, Al-Ibraheemi A, Qian X. Cytomorphologic Spectrum of SMARCB1-Deficient Soft Tissue Neoplasms. Am J Clin Pathol 2021; 156:229-245. [PMID: 33608696 DOI: 10.1093/ajcp/aqaa223] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
OBJECTIVES The SWI/SNF complex core subunit SMARCB1 is inactivated in a variety of neoplasms that share characteristic "rhabdoid" cytomorphology. The aim of this study was to evaluate SMARCB1-deficient soft tissue neoplasms on cytology to identify diagnostic clues. METHODS Eleven SMARCB1-deficient tumors, including six epithelioid sarcomas, three malignant rhabdoid tumors, one epithelioid malignant peripheral nerve sheath tumor (MPNST), and one poorly differentiated chordoma with fine-needle aspiration (FNA), serous effusion, or touch prep (TP) from two institutions, were included. Targeted next-generation sequencing (NGS) was performed in two cases. RESULTS Evaluation of FNA (n = 4), effusion (n = 4), and TP (n = 3) in nine adult and two pediatric patients demonstrated cellular samples (n = 11), epithelioid cells with rhabdoid morphology (n = 9), eccentrically located nuclei with prominent nucleoli (n = 7), and cytoplasmic bodies (n = 4); two patients were diagnosed on FNA with cell block. Immunohistochemistry (IHC) demonstrated SMARCB1 loss in all cases and keratin and/or EMA expression in all but the epithelioid MPNST; NGS identified SMARCB1 inactivation in both cases. CONCLUSIONS SMARCB1-deficient soft tissue neoplasms comprise a variety of tumors with epithelioid morphology and frequent expression of keratin and/or EMA. Recognition of characteristic rhabdoid morphology on cytology can prompt IHC and/or NGS testing for SMARCB1 deficiency and help establish the diagnosis.
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Affiliation(s)
| | - Alyaa Al-Ibraheemi
- Department of Pathology, Boston Children’s Hospital, Harvard Medical School, Boston, MA, USA
| | - Xiaohua Qian
- Department of Pathology, Brigham and Women’s Hospital
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3
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Du P, Zhu J, Zhang ZD, He C, Ye MY, Liu YX, Tian QH, Zeng JS. Recurrent epithelioid malignant peripheral nerve sheath tumor with neurofibromatosis type 1: A case report and literature review. Oncol Lett 2019; 18:3072-3080. [PMID: 31452784 PMCID: PMC6704279 DOI: 10.3892/ol.2019.10676] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2018] [Accepted: 04/26/2019] [Indexed: 01/09/2023] Open
Abstract
Malignant peripheral nerve sheath tumors (MPNSTs) are unusual and aggressive malignant soft-tissue tumors that comprise 5-10% of all soft-tissue sarcomas. Approximately 50% of MPNST cases are associated with neurofibromatosis type-1 (NF-1). As a rare MPNST subset, the epithelioid variant of MPNST (eMPNST) is histologically characterized by the predominant presence of epithelioid tumor cells, and accounts for <5% of all MPNSTs. In addition, eMPNST is rarely associated with NF-1 when compared with conventional MPNST. Although extensive clinicopathological studies have been conducted on eMPNST, clinicians face difficulty when attempting to make an accurate diagnosis. Subsequently, the biological consequences, including recurrence, metastasis and mortality rate in patients with eMPNST remain unclear. The current study presents the case of a 71-year-old woman with eMPNST and a family history of NF-1 in whom tumors had recurred twice on the lower back. A literature search for eMPNSTs was conducted by browsing PubMed and MEDLINE for English-language articles, as well as references from review articles, and revealed 129 published cases. Only 5 cases of eMPNST were associated with NF-1. The studies were retrospectively reviewed and the clinicopathological data of the patients, including tumor site, treatment, follow-up, prognosis, and immunohistochemical positivity were collected.
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Affiliation(s)
- Peng Du
- Department of General Surgery, The First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi 330006, P.R. China
| | - Jia Zhu
- Department of General Surgery, The First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi 330006, P.R. China
| | - Zhen-Dong Zhang
- Department of Pathology, The First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi 330006, P.R. China
| | - Chong He
- Department of General Surgery, The First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi 330006, P.R. China
| | - Mei-Yu Ye
- Department of General Surgery, The First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi 330006, P.R. China
| | - Ya-Xiong Liu
- Department of General Surgery, The First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi 330006, P.R. China
| | - Qiu-Hong Tian
- Department of Oncology, The First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi 330006, P.R. China
| | - Jin-Sheng Zeng
- Department of General Surgery, The First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi 330006, P.R. China
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4
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Cowan ML, VandenBussche CJ. Cancer of unknown primary: Ancillary testing of cytologic and small biopsy specimens in the era of targeted therapy. Cancer Cytopathol 2018; 126 Suppl 8:724-737. [DOI: 10.1002/cncy.22014] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2018] [Revised: 04/19/2018] [Accepted: 04/19/2018] [Indexed: 12/16/2022]
Affiliation(s)
- Morgan L. Cowan
- Department of PathologyThe Johns Hopkins University School of Medicine Baltimore Maryland
| | - Christopher J. VandenBussche
- Department of PathologyThe Johns Hopkins University School of Medicine Baltimore Maryland
- Department of OncologyThe Johns Hopkins University School of Medicine Baltimore Maryland
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5
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Gupta RK, Saran RK, Ghuliani D, Garg L, Das A. Metastatic Epithelioid Malignant Peripheral Nerve Sheath Tumor in a Known Case of Neurofibromatosis-1, Cytomorphological Appearance, and Critical Analysis of Immunohistochemistry. Indian J Med Paediatr Oncol 2017; 38:387-390. [PMID: 29200699 PMCID: PMC5686992 DOI: 10.4103/ijmpo.ijmpo_113_17] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Malignant peripheral nerve sheath tumors (MPNSTs) are rare soft tissue tumors commonly arising from nerve roots in the extremities with a predilection in neurofibromatosis (NF) patients. MPNSTs are known to behave aggressively, with worse prognosis in nonresectable cases, and a 5-year survival of about 52% and 15% in resectable and unresectable cases, respectively. Although cytological diagnosis in a known case of NF-1 is possible, however, in the absence of any associated syndrome in a sporadic case, it is very challenging to accurately diagnose this tumor. Till date, to the best of our knowledge, only three cases of epithelioid MPNST correctly diagnosed on cytological examination have been described. We are presenting another case of epithelioid MPNST in a 40-year-old patient with stigmata of NF-1 since childhood, diagnosed on fine-needle aspiration cytology from the left flank mass with subsequent histopathology from left inguinal lymph node metastasis.
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Affiliation(s)
- Rakesh Kumar Gupta
- Department of Pathology, GB Pant Institute of Postgraduate Medical Education and Research, New Delhi, India
| | - Ravindra Kumar Saran
- Department of Pathology, GB Pant Institute of Postgraduate Medical Education and Research, New Delhi, India
| | - Deepak Ghuliani
- Department of Surgery, Maulana Azad Medical College, New Delhi, India
| | - Lalit Garg
- Department of Radiodiagnosis, GB Pant Institute of Postgraduate Medical Education and Research, New Delhi, India
| | - Abhijit Das
- Department of Pathology, Hindu Rao Hospital, North Delhi Municipal Corporation, New Delhi, India
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6
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Jiwani S, Gokden M, Lindberg M, Ali S, Jeffus S. Fine-needle aspiration cytology of epithelioid malignant peripheral nerve sheath tumor: A case report and review of the literature. Diagn Cytopathol 2015; 44:226-31. [DOI: 10.1002/dc.23401] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2015] [Revised: 09/06/2015] [Accepted: 11/09/2015] [Indexed: 11/08/2022]
Affiliation(s)
- Shahanawaz Jiwani
- Department of Pathology; University of Arkansas for Medical Sciences; Little Rock Arkansas
| | - Murat Gokden
- Department of Pathology; University of Arkansas for Medical Sciences; Little Rock Arkansas
| | - Matthew Lindberg
- Department of Pathology; University of Arkansas for Medical Sciences; Little Rock Arkansas
| | - Sumera Ali
- Department of Radiology; University of Arkansas for Medical Sciences; Little Rock Arkansas
| | - Susanne Jeffus
- Department of Pathology; University of Arkansas for Medical Sciences; Little Rock Arkansas
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7
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Wakely PE, Ali SZ, Bishop JA. The cytopathology of malignant peripheral nerve sheath tumor: a report of 55 fine-needle aspiration cases. Cancer Cytopathol 2012; 120:334-41. [PMID: 22434579 DOI: 10.1002/cncy.21195] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2012] [Accepted: 02/27/2012] [Indexed: 11/11/2022]
Abstract
BACKGROUND Among sarcomas, a diagnosis of malignant peripheral nerve sheath tumor (MPNST) is often one of exclusion due to the absence of unequivocally characteristic histopathology, a conclusive immunohistochemical profile, or even a unique chromosomal anomaly. Because of this, the fine-needle aspiration (FNA) cytopathology of MPNST is extremely challenging. In the current study, the authors review their FNA experience with this neoplasm. METHODS The authors searched their combined departmental cytology files for all lesions signed out as MPNST or suspicious for MPNST, as well as their own surgical pathology files for any cases of MPNST that had corresponding cytology. FNA was performed using standard techniques. RESULTS A total of 55 cases of MPNST, all with tissue confirmation, and 1 misdiagnosed example of melanoma were retrieved from 52 patients (M:F ratio of 1.5:1; average age, 46 years), 26 of whom had a history of neurofibromatosis type 1 (NF-1). Aspirates were from primary (27 cases), locally recurrent (14 cases), or metastatic (10 cases) MPNST; 4 primary tumor aspirates were of ex vivo specimens. Sites included the extremities (22 cases), trunk/pelvis (22 cases), head and neck (6 cases), and deep-seated masses (6 cases). FNA diagnoses were MPNST (24 patients); consistent with MPNST (5 patients); sarcoma, not otherwise specified (10 patients); atypical (3 patients); spindle cell neoplasm (6 patients); malignant neoplasm (1 patient); and nondiagnostic (3 patients). A definitive diagnosis of either MPNST or consistent with MPNST was issued in 30%, 93%, and 70%, respectively, of primary, locally recurrent, and metastatic lesions. CONCLUSIONS FNA cytopathology is limited as a diagnostic instrument for the initial diagnosis of MPNST, but is exceedingly accurate and valuable in the recognition of metastatic and locally recurrent MPNST.
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Affiliation(s)
- Paul E Wakely
- Department of Pathology, Wexner Medical Center, Ohio State University, Columbus, USA.
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9
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Gulati N, Rekhi B, Suryavanshi P, Jambhekar NA. Epithelioid malignant peripheral nerve sheath tumor of the uterine corpus. Ann Diagn Pathol 2010; 15:441-5. [PMID: 20952276 DOI: 10.1016/j.anndiagpath.2010.06.002] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2010] [Revised: 05/08/2010] [Accepted: 06/13/2010] [Indexed: 11/15/2022]
Abstract
Epithelioid variant of a malignant peripheral nerve sheath tumor (MPNST) is a rare sarcoma. Rarer still is its occurrence at uncommon sites like the uterine corpus where an index of suspicion for this diagnosis is extremely low. Herein, we report a rare case of a uterine epithelioid MPNST in a young girl who underwent a total abdominal hysterectomy for a uterine tumor that was initially diagnosed as an undifferentiated sarcoma and whose paraffin blocks were submitted to us for review. Biopsy sections showed a malignant tumor, predominantly composed of polygonal cells, including "rhabdoid" forms with conspicuous mitoses. On immunohistochemistry, tumor cells were diffusely positive for vimentin and S-100 and negative for smooth muscle actin, desmin, myogenin cytokeratin, epithelial membrane antigen, melan A, HMB-45, CD10, glial fibrillary acid protein inhibin, synaptophysin, chromogranin, MIC2, FLI-1, and neuron-specific enolase. Diagnosis of an epithelioid MPNST was offered. The case is presented in view of its rarity and also to highlight the value of immunohistochemistry in objectively identifying unusual sarcomas at uncommon sites.
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Affiliation(s)
- Natasha Gulati
- Department of Pathology, Tata Memorial Hospital, Parel, Mumbai, India, 400012
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10
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Fisher BJ, Dennis KEB. Malignant epithelioid cranial nerve sheath tumor: case report of a radiation response. J Neurooncol 2006; 78:173-7. [PMID: 16557352 DOI: 10.1007/s11060-005-9083-z] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2005] [Accepted: 11/28/2005] [Indexed: 10/24/2022]
Abstract
Malignant epithelioid nerve sheath tumors (MESs) especially those involving intracranial cranial nerves are rare and thought to be radioresistant. We report a case of a MES involving the Vth and VIIth cranial nerves responsive to radiotherapy. A 41-year-old man with progressive left facial weakness underwent an MRI that disclosed an enhancing lesion involving both V3 cranial nerve and the distal VIIth nerve. Biopsy confirmed a malignant epithelioid schwannoma. The tumor was resected but residual tumor was present at the cut end of the infraorbital nerve, within the oral cavity and at the brainstem. Positive excision margins were irradiated to 60 Gy/30 fractions by a wedge pair technique extending from the inferior orbit to C2. Tumor was controlled for 38 months and then radiographic recurrence was resected from the infratemporal fossa outside the irradiated field.A new primary MES tumor developed at 69 months at the C1/C2 root levels at the lower edge of the previously irradiated field. It was subtotally resected but by 77 months residual tumor had grown inferiorly down to C5 so this area was re-irradiated with a complicated 7-field approach to spare spinal cord. Initially the tumor responded but ultimately progressed posteriorly where radiation dose was limited by spinal cord tolerance. New involvement of the Xth cranial nerve was noted. The patient expired from brainstem compression 7 years after initial radiotherapy. The long-term control of the original tumor despite positive margins argues for the use of radiotherapy in the treatment of these tumors.
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Affiliation(s)
- Barbara J Fisher
- Department of Radiation Oncology, London Regional Cancer Program, London Health Sciences Centre, University of Western Ontario, London, ON, Canada.
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11
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Matsuda Y, Saoo K, Hosokawa K, Yamakawa K, Yokohira M, Zeng Y, Takeuchi H, Iwai J, Shirai T, Obika K, Imaida K. Epithelioid malignant peripheral nerve sheath tumor. Report of a case with inflammatory infiltration. Pathol Res Pract 2005; 201:355-60. [PMID: 15991844 DOI: 10.1016/j.prp.2005.01.008] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The epithelioid malignant peripheral nerve sheath tumor (EMPNST) is a rare sarcoma originating from the supportive non-neuronal components of peripheral nerves. Our patient was a 75-year-old Japanese man who presented with complaints about pain and a mass in the left thigh. Characteristic histopathological features were large epithelioid-like cells closely resembling a malignant melanoma or another type of soft tissue tumor. Notable infiltration of neutrophils in the tumor was seen. Immunohistochemically, the tumor cells proved positive for S-100, NSE, GFAP, MBP, chromogranin A and synaptophysin, and negative for CEA, keratin, HMB-45, G-CSF, and GM-CSF. Tumor-related inflammatory infiltration may be caused by an autonomous production of some cytokines. However, these tumor cells were negative for G-CSF and GM-CSF so that the mechanism triggering inflammatory infiltration is unclear. Electron microscopy revealed the presence of an extracellular basal lamina, intermediate cell junctions, and numerous dense-cored granules in the cytoplasm. These findings suggested a schwannian derivation, consistent with the diagnosis of EMPNST. There have been reports on S-100 positivity and HMB-45 negativity of this tumor type, but to the best of our knowledge, this is the first description of an EMPNST positive for MBP, chromogranin A, and synaptophisin. Where unequivocal features are lacking, these markers might be useful for differential diagnosis.
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Affiliation(s)
- Yoko Matsuda
- Onco-Pathology, Department of Pathology and Host-Defense, Faculty of Medicine, Kagawa University, 1750-1 Ikenobe, Miki-cho, Kita-gun, Kagawa 761-0793, Japan
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12
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Staklenac B, Pauzar B, Pajtler M, Loncar B, Dmitrović B. An unusual tumour of the breast: cytological findings. Cytopathology 2004; 15:160-2. [PMID: 15165273 DOI: 10.1111/j.1365-2303.2004.00131.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- B Staklenac
- Department of Clinical Cytology, University Hospital Osijek, Osijek, Croatia.
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13
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Soualhi M, El Ouazani H, Chaibainou A, Bouchentouf R, El Ftouh M, Mouline S, El Fassy Fihry MT. [Epithelioid malignant peripheral nerve sheath tumor. A case report]. REVUE DE PNEUMOLOGIE CLINIQUE 2004; 60:50-54. [PMID: 15107669 DOI: 10.1016/s0761-8417(04)72084-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Malignant peripheral nerve sheath tumors (MPNST) are exceptional and painful. The typical localization along a peripheral nerve is not always present. Prognosis is very poor. Diagnosis is particularly difficult because of the variable pathological presentation and unpredictable differentiation. We report an exceptional case of epithelioid differentiation in a 43-Year-old patient who complained of right thoracic pain for one and a half Years. Physical examination revealed weight loss and a paravertebral mass under the scapula. The chest x-ray showed a suprahilar opacity suggestive of parietal involvement and lysis of the sixth rib. Surgical biopsy of the parietal mass led to the diagnosis of epithelioid MPNST.
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Affiliation(s)
- M Soualhi
- Service de Pneumologie, Centre Hospitalier Universitaire Ibn Sina, Rabat, Maroc
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Klijanienko J, Caillaud JM, Lagacé R, Vielh P. Cytohistologic correlations of 24 malignant peripheral nerve sheath tumor (MPNST) in 17 patients: the Institut Curie experience. Diagn Cytopathol 2002; 27:103-8. [PMID: 12203877 DOI: 10.1002/dc.10152] [Citation(s) in RCA: 59] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Cytomorphological patterns of malignant peripheral nerve sheath tumor (MPNST) are insufficiently documented in the literature. Cytological and histological specimens in 24 tumors in 17 patients were correlated. The review of the original cytology reports showed that four (16.6%) tumors were correctly diagnosed, eight (33.3%) were diagnosed as sarcoma not otherwise specified, four (16.7%) as fibrosarcoma, three (12.5%) as synovial sarcoma, three (12.5%) as leiomyosarcoma, and one (4.2%) case each as malignant fibrous histiocytoma and rhabdomyosarcoma. At the review tumors were histologically reclassified as well-differentiated MPNST in 11 (45.9%) cases, anaplastic MPNST in 11 (45.9%) cases, and epithelioid MPNST and malignant Triton tumor in one (4.2%) case each. Cytologically, well-differentiated MPNST were composed of polymorphous oval to round cells, small spindle-shaped cells with wavy and comma-like naked nuclei, and a fibrillary, delicate stroma. Anaplastic MPNST, moreover, were composed of anaplastic giant and polymorphous cells. The malignant Triton tumor was composed of oval to round rhabdomyoblastic cells with eccentric nuclei and the epithelioid MPNST of polymorphous and round, epithelial-like cells. The cytological diagnosis of MPNST may be difficult, especially in anaplastic tumors. The correlation between the cytological features and the clinical information--origin of the tumor from a nerve trunk, a preexisting neurofibroma, patients with known history of neurofibromatosis 1--could be indicative of an MPNST diagnosis.
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Affiliation(s)
- Jerzy Klijanienko
- Department of Tumor Biology, Unité de Cytopathologie et Cytométrie Clinique, Institut Curie, Paris, France.
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15
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Reis-Filho JS, Pope LZB, Balderrama CMSR, Fillus-Neto J, Schmitt FC. Epithelioid malignant peripheral nerve sheath tumour: case report and review of the previously published cases. Cytopathology 2002; 13:54-63. [PMID: 11985569 DOI: 10.1046/j.1365-2303.2002.00368.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Affiliation(s)
- Jorge S Reis-Filho
- Institute of Molecular Pathology and Immunology, University of Porto, Portugal
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Platt SR, Graham J, Chrisman CL, Collins K, Chandra S, Sirninger J, Newell SM. Magnetic resonance imaging and ultrasonography in the diagnosis of a malignant peripheral nerve sheath tumor in a dog. Vet Radiol Ultrasound 1999; 40:367-71. [PMID: 10463831 DOI: 10.1111/j.1740-8261.1999.tb02128.x] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Abstract
A 9-year-old male neutered mixed breed dog had a two-month history of progressive left thoracic limb lameness. There was electromyographic evidence of denervation potentials in all muscles of this limb. In magnetic resonance images a multilobulated, hyperintense mass was visible caudal to the middiaphysis of the left humerus on T-2 weighted images. The mass, which was isointense with surrounding tissue on T1 weighted images, extended proximally towards the brachial plexus. The mass was also visible as a fusiform structure of mixed echogenicity sonographically, although fine-needle aspiration performed at this time was nondiagnostic. A malignant peripheral nerve sheath tumor was diagnosed histopathologically.
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Affiliation(s)
- S R Platt
- Department of Small Animal Clinical Sciences, College of Veterinary Medicine, University of Florida, Gainesville 32610, USA
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