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Potterveld SK, Mubeen A, Anderson WJ, Clay MR, Bourgeau M, Charville GW, Sangoi AR. Diagnosing liposarcoma on (peri)-renal mass biopsy: A clinicopathological study of 30 cases. Histopathology 2024; 85:254-262. [PMID: 38646791 DOI: 10.1111/his.15197] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2024] [Revised: 03/25/2024] [Accepted: 04/06/2024] [Indexed: 04/23/2024]
Abstract
AIMS Classification of renal neoplasms on small tissue biopsies is in increasing demand, and maintaining broad differential diagnostic considerations in this setting is necessary. When evaluating a renal or perirenal tumour biopsy with sarcomatoid morphology, together with sarcomatoid renal cell carcinoma and sarcomatoid urothelial carcinoma as top diagnostic considerations, it is vital to additionally consider the possibility of well-differentiated and de-differentiated liposarcoma. METHODS AND RESULTS This study reports a series of 30 biopsy samples from sites in or around the kidney collected from four institutions in which the correct diagnosis was either well-differentiated or de-differentiated liposarcoma. The majority (26 of 30, 87%) of lesions were accurately diagnosed on biopsy sampling, all of which incorporated testing for MDM2 by immunohistochemistry (IHC), fluorescence in-situ hybridisation (FISH) or a combination of the two as part of the diagnostic work-up. Tumour expression of MDM2 by IHC without confirmatory FISH analysis was sometimes (30%) sufficient to reach a diagnosis, but demonstration of MDM2 amplification by FISH was ascertained in the majority (57%) of biopsy samples. A diagnosis of de-differentiated liposarcoma was not definitively established until resection in four (13%) patients, as no MDM2 testing was performed on the corresponding pre-operative biopsies. CONCLUSIONS When a retroperitoneal tumour is not clinically suspected, histological consideration of a liposarcoma diagnosis may be overlooked. Implementation of ancillary immunohistochemical and cytogenetic testing can ultimately lead to a definitive diagnosis in this potentially misleading anatomical location.
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Affiliation(s)
| | | | | | | | | | | | - Ankur R Sangoi
- Department of Pathology, Stanford Medical Center, Stanford, CA, USA
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2
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Ortiz-Rey JA, García-Baizán A, Bellas-Pereira A, Barciela-Bastos A, Gómez-de María C, Conde-Ferreirós M. Myxoid Pseudotumor Changes Affecting the Distal Ureter Associated With Urothelial Carcinoma In Situ. Int J Surg Pathol 2024; 32:772-775. [PMID: 37525552 DOI: 10.1177/10668969231188894] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/02/2023]
Abstract
Myxoid pseudotumor is a pseudoneoplastic fibroblastic proliferation that has been described in the perinephric and renal sinus fat tissue. It is characterized by the presence of a myxoid matrix, intermingled with the adipocytes, and a hypocellular population of spindle-shaped and stellate cells. We report a myxoid pseudotumor involving the distal ureter, which broadens the spectrum of possible localizations of this lesion around the urinary tract. It occurred in an 80-year-old patient who underwent a nephroureterectomy indicated after an incidental radiological finding of a thickening of the distal left ureter wall which suggested a ureteral neoplasm. He had two voided urine and one ureteroscopic sample cytologies diagnosed as high-grade urothelial carcinoma, as well as a retrograde ureteroscopy ureteral biopsy which was diagnosed as urothelial carcinoma in situ. This emphasizes the problem of the possible misdiagnosis of myxoid pseudotumor as a ureteral infiltrative carcinoma due to the radiological findings being badly interpreted, compounded by the preoperative cytohistologic data on malignancy. A diffuse urothelial carcinoma in situ was seen in our specimen without infiltrative or papillary tumors. This would not support an obstructive pathogenetic mechanism as has been hypothesized for myxoid pseudotumor.
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Affiliation(s)
- José A Ortiz-Rey
- Department of Pathology, Hospital Álvaro Cunqueiro, Vigo, Spain
- Uropathology Research Group, Galicia Sur Health Research Institute (IIS Galicia Sur) SERGAS-UVIGO, Vigo, Spain
| | | | | | | | - Carolina Gómez-de María
- Biobank of Galicia Sur Health Research Institute (IIS Galicia Sur), SERGAS-UVIGO, Vigo, Spain
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3
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Kallen ME, Drachenberg CB, Legesse TB. Lesson of the Month: perinephric myxoid pseudotumor of fat co-occurring with polycystic kidney disease. Histopathology 2024. [PMID: 38708908 DOI: 10.1111/his.15210] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2024] [Accepted: 04/25/2024] [Indexed: 05/07/2024]
Affiliation(s)
- Michael E Kallen
- Department of Pathology, University of Maryland School of Medicine, Baltimore, MD, USA
| | - Cinthia B Drachenberg
- Department of Pathology, University of Maryland School of Medicine, Baltimore, MD, USA
| | - Teklu B Legesse
- Department of Pathology, University of Maryland School of Medicine, Baltimore, MD, USA
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4
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Broski SM, Knight JA, Larsen BT, Folpe AL, Wenger DE. Imaging features of perinephric myxoid pseudotumors of fat. Abdom Radiol (NY) 2024:10.1007/s00261-024-04294-9. [PMID: 38615061 DOI: 10.1007/s00261-024-04294-9] [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: 01/25/2024] [Revised: 03/12/2024] [Accepted: 03/13/2024] [Indexed: 04/15/2024]
Abstract
OBJECTIVE Retrospectively evaluate multimodality imaging features of perinephric myxoid pseudotumor of fat (PMPTF). METHODS Institutional cases of PMPTF with CT, MRI and/or ultrasound evaluation from 1/1/2020 to 9/1/2023 were retrospectively reviewed. Patient demographics and clinical history were reviewed, and imaging features recorded. RESULTS 14 patients with pathologically-proven PMPTF were identified (11 M, 3 F; mean age 66.7 ± 17.0 years; range 40-87 years). Three patients (18%) had bilateral lesions; a total of 17 PMPTFs were reviewed. 15/17 (88%) were biopsy-proven; two cases were diagnosed by imaging only in patients with a contralateral biopsy-proven PMPTF. All evaluable specimens were negative for MDM2 amplification. 11/17 (65%) occurred in patients with renal disease, including 4/17 (24%) in patients with renal transplant. 100% (17/17) had CT, 11/17 (65%) MRI, and 6/17 (35%) ultrasound. The mean largest lesion dimension was 10.9 ± 4.6 cm (range 4.3-17.0 cm). Of cases involving native kidneys, 7/13 (54%) presented as multifocal perinephric masses and 5/13 (38%) as a solitary perinephric mass. All four transplant cases presented as infiltrative-appearing masses involving the renal sinus with lesser perinephric involvement. 14/17 (82%) lesions contained macroscopic fat on CT and MRI and 3/17 (18%) showed no macroscopic fat, all involving renal transplants. All cases with MRI demonstrated T2 hyperintensity with signal dropout on opposed-phase imaging. 11/13 (85%) PMPTF showed no or equivocal CT enhancement. Enhancement was better seen on MRI in all cases evaluated by both CT and MRI. Of the six PMPTFs imaged by ultrasound, four (67%) were heterogeneously hypoechoic and two (33%) had mixed regions of hypo-, iso- and hyperechogenicity relative to adjacent renal parenchyma. CONCLUSIONS PMPTF is a rare, benign, and underrecognized lesion that may mimic malignancy, particularly retroperitoneal well-differentiated liposarcoma. The imaging features of this unusual pseudosarcoma differ in native and transplanted kidneys. Improved awareness of this entity will facilitate appropriate patient management and avoid unnecessary intervention.
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Affiliation(s)
- Stephen M Broski
- Department of Radiology, Mayo Clinic, Charlton Building North, 1st Floor, 200 First Street SW, Rochester, MN, 55905, USA.
| | - Jennifer A Knight
- Department of Radiology, Mayo Clinic, Charlton Building North, 1st Floor, 200 First Street SW, Rochester, MN, 55905, USA
| | - Brandon T Larsen
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Phoenix, AZ, 85054, USA
| | - Andrew L Folpe
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN, 55905, USA
| | - Doris E Wenger
- Department of Radiology, Mayo Clinic, Charlton Building North, 1st Floor, 200 First Street SW, Rochester, MN, 55905, USA
- Department of Orthopedic Surgery, Mayo Clinic, Rochester, MN, 55905, USA
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5
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Gilani SI, Buglioni A, Cornell LD. IgG4-related kidney disease: Clinicopathologic features, differential diagnosis, and mimics. Semin Diagn Pathol 2024; 41:88-94. [PMID: 38246802 DOI: 10.1053/j.semdp.2023.12.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/14/2023] [Accepted: 12/11/2023] [Indexed: 01/23/2024]
Abstract
IgG4-related kidney disease (IgG4-RKD) encompasses all forms of kidney disease that are part of IgG4-related disease (IgG4-RD). First recognized as IgG4-related tubulointerstitial nephritis (IgG4-TIN), and then IgG4-related membranous glomerulonephritis (IgG4-MGN), we now recognize additional patterns of interstitial nephritis, glomerular disease, and vascular disease that can be seen as part of IgG4-RKD. The clinical presentation is variable and can include acute or chronic kidney injury, proteinuria or nephrotic syndrome, mass lesion(s), and obstruction. While usually associated with other organ involvement by IgG4-RD, kidney-alone involvement is present in approximately 20 % of IgG4-RKD. Compared to IgG4-RD overall, patients with IgG4-RKD are more likely to show increased serum IgG4 or IgG, and more likely to have hypocomplementemia. In this review, we extensively cover other types of autoimmune and plasma cell-rich interstitial nephritis, mass forming inflammatory diseases of the kidney, and other mimics of IgG4-TIN, in particular ANCA-associated disease.
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Affiliation(s)
- Sarwat I Gilani
- Department of Pathology and Laboratory Medicine, University of Texas Health Science Center at San Antonio, TX, USA
| | - Alessia Buglioni
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, Minnesota, USA
| | - Lynn D Cornell
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, Minnesota, USA.
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6
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Shanbhogue KP, Ramani N, Surabhi VR, Balasubramanya R, Prasad SR. Tumefactive Nonneoplastic Proliferative Pseudotumors of the Kidneys and Urinary Tract: CT and MRI Findings with Histopathologic Correlation. Radiographics 2023; 43:e230071. [PMID: 37971934 DOI: 10.1148/rg.230071] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2023]
Abstract
A diverse spectrum of pathologically distinct, nonneoplastic, proliferative conditions of the kidneys and urinary tract demonstrate a expansile growth pattern similar to that of neoplasms. The renal pseudotumors include myriad causes of infections as well as rare noninfectious causes such as sarcoidosis, amyloidosis, and immunoglobulin G4-related disease (IgG4-RD). Rare entities such as cystitis cystica, endometriosis, nephrogenic adenoma, and pseudosarcomatous myofibroblastic proliferation and distinct types of prostatitis comprise tumefactive nontumorous disorders that affect specific segments of the urinary tract. The pseudotumors of the kidneys and urinary tract demonstrate characteristic histopathologic and epidemiologic features, as well as protean clinical manifestations, natural history, and imaging findings. Many patients present with genitourinary tract-specific symptoms or systemic disease. Some cases may be incidentally discovered at imaging. Some entities such as perinephric myxoid pseudotumors, IgG4-RD, fibroepithelial polyp, and nephrogenic adenoma display specific anatomic localization and disease distribution. Imaging features of multisystem disorders such as tuberculosis, sarcoidosis, and IgG4-RD provide supportive evidence that may allow precise diagnosis. Fungal pyelonephritis, xanthogranulomatous pyelonephritis, IgG4-RD, actinomycosis, and endometriosis show markedly low signal intensity on T2-weighted MR images. Although some pseudotumors exhibit characteristic imaging findings that permit correct diagnosis, laboratory correlation and histopathologic confirmation are required for definitive characterization in most cases. A high index of suspicion is a prerequisite for diagnosis. Accurate diagnosis is critical for instituting optimal management while preventing use of inappropriate therapies or interventions. Surveillance CT and MRI are frequently used for monitoring the response of pseudotumors to therapy. ©RSNA, 2023 Quiz questions for this article are available in the supplemental material.
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Affiliation(s)
- Krishna Prasad Shanbhogue
- From the Departments of Radiology (K.P.S., V.R.S., R.B., S.R.P.) and Pathology (N.R.), Michael E. DeBakey VA Medical Center, Houston, Tex; Department of Radiology, NYU Langone Health, New York, NY (K.P.S.); Department of Radiology, Thomas Jefferson University Hospital, Philadelphia, Pa (R.B.); and Department of Radiology, The University of Texas MD Anderson Cancer Center, 1400 Pressler St, Unit 1473, Houston, TX 77030 (V.R.S., S.R.P.)
| | - Nisha Ramani
- From the Departments of Radiology (K.P.S., V.R.S., R.B., S.R.P.) and Pathology (N.R.), Michael E. DeBakey VA Medical Center, Houston, Tex; Department of Radiology, NYU Langone Health, New York, NY (K.P.S.); Department of Radiology, Thomas Jefferson University Hospital, Philadelphia, Pa (R.B.); and Department of Radiology, The University of Texas MD Anderson Cancer Center, 1400 Pressler St, Unit 1473, Houston, TX 77030 (V.R.S., S.R.P.)
| | - Venkateswar R Surabhi
- From the Departments of Radiology (K.P.S., V.R.S., R.B., S.R.P.) and Pathology (N.R.), Michael E. DeBakey VA Medical Center, Houston, Tex; Department of Radiology, NYU Langone Health, New York, NY (K.P.S.); Department of Radiology, Thomas Jefferson University Hospital, Philadelphia, Pa (R.B.); and Department of Radiology, The University of Texas MD Anderson Cancer Center, 1400 Pressler St, Unit 1473, Houston, TX 77030 (V.R.S., S.R.P.)
| | - Rashmi Balasubramanya
- From the Departments of Radiology (K.P.S., V.R.S., R.B., S.R.P.) and Pathology (N.R.), Michael E. DeBakey VA Medical Center, Houston, Tex; Department of Radiology, NYU Langone Health, New York, NY (K.P.S.); Department of Radiology, Thomas Jefferson University Hospital, Philadelphia, Pa (R.B.); and Department of Radiology, The University of Texas MD Anderson Cancer Center, 1400 Pressler St, Unit 1473, Houston, TX 77030 (V.R.S., S.R.P.)
| | - Srinivasa R Prasad
- From the Departments of Radiology (K.P.S., V.R.S., R.B., S.R.P.) and Pathology (N.R.), Michael E. DeBakey VA Medical Center, Houston, Tex; Department of Radiology, NYU Langone Health, New York, NY (K.P.S.); Department of Radiology, Thomas Jefferson University Hospital, Philadelphia, Pa (R.B.); and Department of Radiology, The University of Texas MD Anderson Cancer Center, 1400 Pressler St, Unit 1473, Houston, TX 77030 (V.R.S., S.R.P.)
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7
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Myxoid Pseudotumor Involving the Renal Sinus: Clinicopathologic Study of 33 Cases Supporting a Distinct Benign Non-neoplastic Lesion. Am J Surg Pathol 2023; 47:218-223. [PMID: 36040041 DOI: 10.1097/pas.0000000000001968] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
We describe 33 cases of myxoid pseudotumor involving the renal sinus from 31 patients. Patients included 21 men and 10 women, ages 30 to 95 years. Twenty-seven cases (82%) had an associated malignancy, including urothelial carcinoma of the renal pelvis (22 cases), clear cell renal cell carcinoma (3 cases), urothelial carcinoma of the bladder (1 case), and poorly differentiated carcinoma of uncertain lineage (1 case). The remaining 6 (18%) had no associated malignancy and included 3 nephrectomies for ureteral stricture, 2 ureteropelvic junction repairs, and 1 resection of a "periureteral mass" (subsequently shown to be myxoid pseudotumor). Myxoid pseudotumor was identified by preoperative computed tomography imaging in 2 patients (6%) and identified by the gross dissector in 9 cases (27%). The mean size was 14 mm (range: 5 to 38 mm). All cases had an admixture of adipocytes, myxoid stromal matrix, variable collagenization, and a hypocellular population of bland spindled and stellate stromal cells. No multilobated atypical stromal cells were present. Clinical follow-up was available for 28 patients (90%), ranging from 1 to 132 months (mean: 24.6 mo). No patients had adverse events related to the myxoid pseudotumor. Myxoid pseudotumor of the renal sinus is often associated with a variety of adjacent neoplastic and non-neoplastic conditions and may present as a mass lesion detectable by imaging and/or gross inspection. Awareness of this benign process is important to avoid confusion with a neoplasm, especially liposarcoma.
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8
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Gambella A, Bertero L, Rondón-Lagos M, Verdun Di Cantogno L, Rangel N, Pitino C, Ricci AA, Mangherini L, Castellano I, Cassoni P. FISH Diagnostic Assessment of MDM2 Amplification in Liposarcoma: Potential Pitfalls and Troubleshooting Recommendations. Int J Mol Sci 2023; 24:ijms24021342. [PMID: 36674856 PMCID: PMC9863600 DOI: 10.3390/ijms24021342] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2022] [Revised: 01/04/2023] [Accepted: 01/06/2023] [Indexed: 01/12/2023] Open
Abstract
MDM2 amplification represents the leading oncogenic pathway and diagnostic hallmark of liposarcoma, whose assessment is based on Fluorescence In Situ Hybridization (FISH) analysis. Despite its diagnostic relevance, no univocal interpretation criteria regarding FISH assessments of MDM2 amplification have been established so far, leading to several different approaches and potential diagnostic misinterpretations. This study aims to address the most common issues and proposes troubleshooting guidelines for MDM2 amplification assessments by FISH. We retrospectively retrieved 51 liposarcomas, 25 Lipomas, 5 Spindle Cell Lipoma/Pleomorphic Lipomas, and 2 Atypical Spindle Cell Lipomatous Tumors and the corresponding MDM2 FISH analysis. We observed MDM2 amplification in liposarcomas cases only (43 out of 51 cases) and identified three MDM2-amplified patterns (scattered (50% of cases), clustered (14% of cases), and mixed (36% of cases)) and two nonamplified patterns (low number of signals (82% of cases) and polysomic (18% of cases)). Based on these data and published evidence in the literature, we propose a set of criteria to guide MDM2 amplification analysis in liposarcoma. Kindled by the compelling importance of MDM2 assessments to improve diagnostic and therapeutic liposarcoma management, these suggestions could represent the first step to develop a univocal interpretation model and consensus guidelines.
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Affiliation(s)
- Alessandro Gambella
- Division of Liver and Transplant Pathology, University of Pittsburgh, Pittsburgh, PA 15213, USA
- Department of Medical Sciences, University of Turin, 10124 Turin, Italy
| | - Luca Bertero
- Department of Medical Sciences, University of Turin, 10124 Turin, Italy
| | - Milena Rondón-Lagos
- School of Biological Sciences, Universidad Pedagógica y Tecnológica de Colombia, Tunja 150003, Colombia
| | - Ludovica Verdun Di Cantogno
- Department of Laboratory Medicine, Azienda Ospedaliera Città della Salute e della Scienza di Torino, 10126 Turin, Italy
| | - Nelson Rangel
- Departamento de Nutrición y Bioquímica, Facultad de Ciencias, Pontificia Universidad Javeriana, Bogotá 110231, Colombia
| | - Chiara Pitino
- Department of Medical Sciences, University of Turin, 10124 Turin, Italy
| | | | - Luca Mangherini
- Department of Medical Sciences, University of Turin, 10124 Turin, Italy
| | | | - Paola Cassoni
- Department of Medical Sciences, University of Turin, 10124 Turin, Italy
- Correspondence: ; Tel.: +39-011-633-5588
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9
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Fibromyxoid Nephrogenic Adenoma: A Series of 43 Cases Reassessing Predisposing Conditions, Clinical Presentation, and Morphology. Am J Surg Pathol 2023; 47:37-46. [PMID: 36395466 DOI: 10.1097/pas.0000000000001986] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Nephrogenic adenoma is a benign epithelial lesion of the genitourinary tract that arises from the reimplantation and proliferation of shed renal tubular cells in areas of urothelial injury and denudation. Fibromyxoid nephrogenic adenoma is a rare variant that consists of compressed spindle-shaped renal epithelial cells in a fibromyxoid background. Only 14 observations of this variant are reported in the literature. We performed a retrospective analysis of fibromyxoid nephrogenic adenomas from 3 large reference centers. We identified 43 lesions in 6 women and 36 men (2 in 1 man) with a median age of 72 years (range, 31 to 94 y). Median lesion size was 0.7 cm (range, 0.2 to 5 cm). Nephrogenic adenomas were in the bladder (n=15), prostate/prostatic urethra (n=14), kidney (n=7), ureter (n=3), penile urethra (n=3), and urethral diverticulum (n=1). One of the kidney lesions developed in an end-stage kidney and radiologically mimicked cancer. Of 37 patients with information, 36 had predisposing conditions including prior biopsy, transurethral resection of bladder tumor, resection, Foley catheter, BCG treatment, urinary stones, (chemo)radiation, or diverticulum. Only 4/37 (10.8%) had a history of prior irradiation. Fifteen lesions had pure fibromyxoid morphology and 28 were admixed classic and fibromyxoid patterns. Three nephrogenic adenomas involved prostatic stroma, 3 renal sinus fat, 2 muscularis propria (1 bladder, 1 renal pelvis), 1 perinephric fat, and 1 corpus spongiosum. Ten fibromyxoid nephrogenic adenomas were intermixed with urothelial carcinoma, 1 with prostate adenocarcinoma, and 1 with malignant melanoma. By immunohistochemistry, PAX8 was positive in all the examined lesions (n=31). Napsin A was negative in all examined fibromyxoid nephrogenic adenomas (n=30). Twenty of them had classic nephrogenic adenoma component which was positive for napsin A. Similar to classic nephrogenic adenoma, fibromyxoid nephrogenic adenoma can occur anywhere along the urinary tract and is associated with a prior history that causes urothelial injury. In nearly a quarter of the cases, fibromyxoid nephrogenic adenoma extended beyond the lamina propria. Unlike previously suggested, fibromyxoid nephrogenic adenoma is not specifically related to prior radiation therapy. Awareness of this variant is important to avoid misdiagnosis and overtreatment.
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10
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Amato M, Piazza P, Ferrari I, Biolcati S, Franceschini T, Puliatti S, Micali S, Manferrari F. Rare perinephric myxoid pseudotumor of fat causing ureteropelvic junction obstruction: a case report. CEN Case Rep 2022; 12:210-214. [PMID: 36378461 PMCID: PMC10151429 DOI: 10.1007/s13730-022-00746-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2022] [Accepted: 11/06/2022] [Indexed: 11/16/2022] Open
Abstract
Ureteropelvic junction obstruction (UPJO) is a congenital or acquired functionally significant impairment of urinary transport from the renal pelvis to the ureter. Congenital UPJO typically results from intrinsic disease such as the presence of an aperistaltic segment of the ureter, aberrant vessels or kidney abnormalities. Rare conditions can sometimes mimic an UPJO. We present a case of an 86-year-old woman with a UPJO diagnosed on CT. The patient was counseled on treatment options and elected to undergo a left uretherorenoscopy (URS) plus left laparoscopic pyeloplasty. The definitive histopathologic diagnosis was perinephric myxoid pseudotumor of fat, an extremely rare neoplasm, mass-forming. To the best of our knowledge, this is the first known case of a pseudotumor of fat causing UPJO. 6-month follow-up showed neither recurrence nor residual UPJO. We describe a rare presentation of extrinsic perinephric myxoid pseudotumor of fat causing UPJ obstruction. In elderly patients with no history of malignancy, UPJ obstruction can occur because of atypical masses.
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Affiliation(s)
- M Amato
- Department of Urology, University of Modena, Modena, Italy.
- Department of Urology, Ramazzini Hospital, Carpi, Italy.
| | - P Piazza
- Department of Urology, Azienda Ospedaliero-Universitaria Di Bologna, Via Albertoni 15, Bologna, Italy
| | - I Ferrari
- Department of Urology, University of Modena, Modena, Italy
- Department of Urology, Ramazzini Hospital, Carpi, Italy
| | - S Biolcati
- Department of Urology, University of Modena, Modena, Italy
- Department of Urology, Ramazzini Hospital, Carpi, Italy
| | - T Franceschini
- Pathology Unit, IRCCS Azienda Ospedaliero-Universitaria Di Bologna, Bologna, Italy
| | - S Puliatti
- Department of Urology, University of Modena, Modena, Italy
| | - S Micali
- Department of Urology, University of Modena, Modena, Italy
| | - F Manferrari
- Department of Urology, Ramazzini Hospital, Carpi, Italy
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11
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Perinephric myxoid pseudotumor of fat in a young patient with a horseshoe kidney complicated by an obstructing renal calculus. Asian J Urol 2022. [PMID: 37538160 PMCID: PMC10394278 DOI: 10.1016/j.ajur.2022.04.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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12
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Lee J, King KG, Chopra S, Cheng PM. Perinephric myxoid pseudotumor of fat: a multimodality imaging case series. Abdom Radiol (NY) 2022; 48:1820-1830. [PMID: 36085375 DOI: 10.1007/s00261-022-03662-7] [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: 06/01/2022] [Revised: 08/20/2022] [Accepted: 08/23/2022] [Indexed: 11/24/2022]
Abstract
Perinephric myxoid pseudotumor of fat (PMPF) is an unusual clinical entity with few prior imaging case reports. We report a multimodality imaging case series of PMPF, consisting of four cases seen in our department with both imaging studies and histopathologic confirmation. Three of the four patients had a history of advanced non-neoplastic renal disease. The perirenal masses in these cases varied in size and appearance. Some lesions resembled cysts or contained macroscopic fat. Enhancement was equivocal on CT, but prominent in one case on MRI and in another on contrast-enhanced ultrasound. Although not known to be malignant, PMPF may be confused for a cyst, liposarcoma, or hypovascular solid neoplasm on imaging. The dominant mass was resected in two cases because of concern for malignancy, while percutaneous CT-guided biopsy was performed in the other two. Mouse double minute 2 (MDM2) gene amplification by fluorescence in situ hybridization (FISH) was negative in all four cases, excluding well-differentiated liposarcoma. Radiologists should be familiar with PMPF to provide appropriate guidance on clinical management.
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Affiliation(s)
- Justin Lee
- Department of Radiology, Keck School of Medicine of USC, Los Angeles, CA, USA
| | - Kevin G King
- Department of Radiology, David Geffen School of Medicine at UCLA, Los Angeles, CA, USA
| | - Shefali Chopra
- Department of Pathology, Keck School of Medicine of USC, Los Angeles, CA, USA
| | - Phillip M Cheng
- Department of Radiology, Keck School of Medicine of USC, 1441 Eastlake Ave., Suite 2315B, Los Angeles, CA, 90033, USA.
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13
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Folpe AL. ‘I Can’t Keep Up!’: an update on advances in soft tissue pathology occurring after the publication of the 2020 World Health Organization classification of soft tissue and bone tumours. Histopathology 2021; 80:54-75. [DOI: 10.1111/his.14460] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2021] [Accepted: 07/21/2021] [Indexed: 12/22/2022]
Affiliation(s)
- Andrew L Folpe
- Department of Laboratory Medicine and Pathology Mayo Clinic Rochester MN USA
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14
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Vargas AC, Joy C, Cheah AL, Jones M, Bonar F, Brookwell R, Garrone B, Talbot J, Harraway J, Gill AJ, Maclean FM. Lessons learnt from MDM2 fluorescence in-situ hybridisation analysis of 439 mature lipomatous lesions with an emphasis on atypical lipomatous tumour/well-differentiated liposarcoma lacking cytological atypia. Histopathology 2021; 80:369-380. [PMID: 34523152 DOI: 10.1111/his.14558] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2021] [Revised: 08/30/2021] [Accepted: 09/04/2021] [Indexed: 11/30/2022]
Abstract
AIMS Amplification of the murine double minute-2 (MDM2) gene, which is usually detected with fluorescence in-situ hybridisation (FISH), is the key driving event for atypical lipomatous tumours (ALTs)/well-differentiated liposarcomas (WDLs). We sought to determine the concordance between the histopathological findings and MDM2 FISH in the diagnosis of ALT/WDL, and to identify the histological features of MDM2-amplified tumours lacking classic atypia. METHODS AND RESULTS We performed a retrospective analysis of all mature lipomatous lesions subjected to MDM2 FISH analysis at our institution. MDM2 FISH analysis was performed on 439 mature lipomatous lesions: 364 (82.9%) were negative and 75 (17%) were positive. In 17 of 75 (22.6%) ALTs/WDLs, cytological atypia was not identified on initial histological assessment, thus favouring lipoma. On review, these cases shared common histological features, consisting of a very low number of relatively small stromal cells within the tumour lobules, with mildly coarse chromatin and oval nuclei, admixed with unremarkable adipocytes in a tumour background devoid of fibroconnective septa, areas of fibrosis, or blood vessels. These cells matched the cells in which FISH showed MDM2 amplification. In contrast, 13 cases (3.5%) regarded as suspicious for ALT/WDL on the basis of histology lacked MDM2 amplification and were reclassified following the FISH findings. CONCLUSIONS We conclude that a subset of lipoma-like ALTs/WDLs are not associated with any of the features typically described in ALT/WDL. Our study also showed that tumours >100 mm are more likely to be ALT/WDL; however, a history of recurrence or concerning clinical/radiological features was not significantly associated with classification as ALT/WDL.
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Affiliation(s)
- Ana Cristina Vargas
- Department of Anatomical Pathology, Sonic Healthcare-Douglass Hanly Moir Pathology, Macquarie Park, Australia.,Cancer Diagnosis and Pathology Group, Kolling Institute of Medical Research, Royal North Shore Hospital, St Leonards, Australia.,Sydney Medical School, University of Sydney, Sydney, New South Wales, Australia
| | - Christopher Joy
- Department of Cytogenetics, Sullivan Nicolaides Pathology, Brisbane, Queensland, Australia
| | - Alison L Cheah
- Department of Anatomical Pathology, Sonic Healthcare-Douglass Hanly Moir Pathology, Macquarie Park, Australia
| | - Martin Jones
- Department of Anatomical Pathology, Sonic Healthcare-Douglass Hanly Moir Pathology, Macquarie Park, Australia
| | - Fiona Bonar
- Department of Anatomical Pathology, Sonic Healthcare-Douglass Hanly Moir Pathology, Macquarie Park, Australia
| | - Ross Brookwell
- Department of Cytogenetics, Sullivan Nicolaides Pathology, Brisbane, Queensland, Australia
| | - Bernadette Garrone
- Department of Cytogenetics, Sullivan Nicolaides Pathology, Brisbane, Queensland, Australia
| | - Joel Talbot
- Department of Anatomical Pathology, Sonic Healthcare-Douglass Hanly Moir Pathology, Macquarie Park, Australia
| | - James Harraway
- Department of Cytogenetics, Sullivan Nicolaides Pathology, Brisbane, Queensland, Australia
| | - Anthony J Gill
- Cancer Diagnosis and Pathology Group, Kolling Institute of Medical Research, Royal North Shore Hospital, St Leonards, Australia.,Sydney Medical School, University of Sydney, Sydney, New South Wales, Australia.,Department of Anatomical Pathology, NSW Health Pathology, Royal North Shore Hospital, Sydney, Australia
| | - Fiona M Maclean
- Department of Anatomical Pathology, Sonic Healthcare-Douglass Hanly Moir Pathology, Macquarie Park, Australia.,Cancer Diagnosis and Pathology Group, Kolling Institute of Medical Research, Royal North Shore Hospital, St Leonards, Australia.,Department of Clinical Medicine, Faculty of Medicine and Health Sciences, Macquarie University, Sydney, New South Wales, Australia
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15
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Thoeni C, Ordon M, Krizova A, Jakate K, Saleeb RM. Perinephric myxoid pseudotumour of fat - first described case in allograft kidney, a mimicker of malignancy. Histopathology 2021; 79:1108-1110. [PMID: 33835530 DOI: 10.1111/his.14382] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2021] [Revised: 04/05/2021] [Accepted: 04/07/2021] [Indexed: 11/28/2022]
Affiliation(s)
- Cornelia Thoeni
- Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, Ontario, Canada
| | - Michael Ordon
- Division of Urology, University of Toronto, Toronto, Ontario, Canada.,St Michael's Hospital, Toronto, Ontario, Canada
| | - Adriana Krizova
- Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, Ontario, Canada.,St Michael's Hospital, Toronto, Ontario, Canada
| | - Kiran Jakate
- Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, Ontario, Canada.,St Michael's Hospital, Toronto, Ontario, Canada
| | - Rola M Saleeb
- Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, Ontario, Canada.,St Michael's Hospital, Toronto, Ontario, Canada
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16
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Chen F, Desai MA, Cernigliaro JG, Edgar MA, Alexander LF. Perinephric myxoid pseudotumor of fat: A very rare entity that can mimic a renal cyst and retroperitoneal liposarcoma on imaging. Clin Imaging 2020; 69:139-144. [PMID: 32731105 DOI: 10.1016/j.clinimag.2020.06.041] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2020] [Revised: 06/11/2020] [Accepted: 06/26/2020] [Indexed: 12/15/2022]
Abstract
We present a case of perinephric myxoid pseudotumor of fat, a rare benign entity that often occurs in patients with non-neoplastic renal disease. In our case, an 80 year old man with end-stage renal disease was imaged over the course of 5 years during evaluation for renal transplantation. Imaging identified a left perinephric mass whose appearance over time and on different imaging modalities variably suggested a simple cyst, cystic neoplasm, and liposarcoma. Contrast enhanced examination was necessary to discern the solid nature of this mass, and ultimately, tissue sampling with histopathologic evaluation and molecular testing were required to make the diagnosis of myxoid pseudotumor of fat and exclude the imaging mimics.
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Affiliation(s)
- Frank Chen
- Department of Radiology, Mayo Clinic, Jacksonville, FL, United States of America.
| | - Madhura A Desai
- Department of Radiology, Mayo Clinic, Jacksonville, FL, United States of America
| | - Joseph G Cernigliaro
- Department of Radiology, Mayo Clinic, Jacksonville, FL, United States of America
| | - Mark A Edgar
- Department of Lab Medicine and Pathology, Mayo Clinic, Jacksonville, FL, United States of America
| | - Lauren F Alexander
- Department of Radiology, Mayo Clinic, Jacksonville, FL, United States of America
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