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Wakely PE, Wangsiricharoen S, Ali SZ. Pleomorphic liposarcoma: A clinicopathologic study of 20 FNA cases. Cancer Cytopathol 2022; 130:705-713. [PMID: 35447010 DOI: 10.1002/cncy.22580] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2022] [Revised: 03/04/2022] [Accepted: 03/04/2022] [Indexed: 12/12/2022]
Abstract
BACKGROUND Pleomorphic liposarcoma (PLPS) is the least common but most aggressive of all forms of liposarcoma (LPS). Its diagnosis relies on the recognition of pleomorphic lipoblasts (PLBs), whose numbers vary considerably. Because few large fine-needle aspiration (FNA) biopsy studies exist, the authors review their experience with PLPS. METHODS The authors' cytopathology files were searched for PLPS with histopathologic verification. FNA biopsy smears were performed via standard techniques. RESULTS Twenty cases from 20 patients (male/female ratio, 2.3/1; age range, 22-77 years; mean age, 58 years) met the inclusion criteria. All had tissue confirmation. Biopsy sites included the following: thigh (11 [55%]), upper extremity (4 [20%]), axilla (2 [10%]), neck (1 [5%]), chest wall (1 [5%]), and mediastinum (1 [5%]). Aspirates were from primary (17 [85%]), locally recurrent (2 [10%]), and metastatic neoplasms (1 [5%]). The FNA diagnoses were PLPS (10 [50%]), myxofibrosarcoma (4 [20%]), LPS (2 [10%]), sarcoma (2 [10%]), and high-grade malignant neoplasm (2 [10%]). Smears showed thick cell clusters and dissociated single forms. Pleomorphic, epithelioid, and bizarre cell/nuclear shapes were common. PLBs were absent, rare, or unnoticed in 45%. In 25%, smears dominated by myxoid stroma were diagnosed as high-grade myxofibrosarcoma or myxoid LPS. Ancillary testing performed in 5 cases had limited diagnostic efficacy. CONCLUSIONS FNA biopsy of PLPS, although able to successfully recognize malignancy, suffers from a sampling bias due to an inability to capture or recognize PLBs in a significant proportion of cases secondary to the heterogeneous composition of this neoplasm.
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Affiliation(s)
- Paul E Wakely
- Department of Pathology, The Ohio State University Wexner Medical Center, Columbus, Ohio, USA.,James Cancer Hospital and Solove Research Institute, Columbus, Ohio, USA
| | | | - Syed Z Ali
- The Johns Hopkins Hospital, Baltimore, Maryland, USA
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Naito T, Saito T, Higuchi T, Inomata A, Hayashi T, Shimada Y, Yamauchi-Ohguchi A, Kenmochi S, Kakinuma C, Yao T. Dedifferentiated retroperitoneal liposarcoma spontaneously occurring in an aged SD rat. J Toxicol Pathol 2018; 31:141-146. [PMID: 29750003 PMCID: PMC5938215 DOI: 10.1293/tox.2017-0055] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2017] [Accepted: 12/13/2017] [Indexed: 11/25/2022] Open
Abstract
Liposarcoma is a rare neoplasm in rats and is characterized by the presence of
lipoblasts containing multiple cytoplasmic vacuoles. We encountered a rare type of
liposarcoma in a male SD (Crj:CD(SD)IGS) rat during a long-term study to gather background
data. At necropsy at 105 weeks of age, there was a large amount of fatty tissue covering
the mesentery, pancreas, and retroperitoneum; a white nodule in the right kidney; and
paleness of the liver. Microscopically, the tumor had a well-differentiated component and
dedifferentiated high-grade component. Immunohistochemical and electron microscopic
examinations revealed that the pleomorphic tumor cells retained the characteristics of
lipoblasts. Distant or disseminated metastasis was also confirmed in various organs. A
liposarcoma with these histological features is extremely rare in rats, and this is the
first report of a highly metastatic dedifferentiated type of liposarcoma originating from
the abdominal fat tissue in a rat.
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Affiliation(s)
- Tomoharu Naito
- Department of Human Pathology, School of Medicine, Juntendo University, 1-1-19 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.,Pharmaceutical & Healthcare Research Laboratories Research & Development Management Headquarters, FujiFilm Corporation, 577 Ushizima, Kaisei-cho, Ashigarakami-gun, Kanagawa 258-8577, Japan
| | - Tsuyoshi Saito
- Department of Human Pathology, School of Medicine, Juntendo University, 1-1-19 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Tamami Higuchi
- Pharmaceutical & Healthcare Research Laboratories Research & Development Management Headquarters, FujiFilm Corporation, 577 Ushizima, Kaisei-cho, Ashigarakami-gun, Kanagawa 258-8577, Japan.,Department of Oncology Clinical Development, Graduate School of Medicine, Gunma University, 3-39-22 Showa-machi, Maebashi, Gunma 371-8511, Japan
| | - Akira Inomata
- Pharmaceutical & Healthcare Research Laboratories Research & Development Management Headquarters, FujiFilm Corporation, 577 Ushizima, Kaisei-cho, Ashigarakami-gun, Kanagawa 258-8577, Japan
| | - Takuo Hayashi
- Department of Human Pathology, School of Medicine, Juntendo University, 1-1-19 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Yasuhiro Shimada
- Department of Human Pathology, School of Medicine, Juntendo University, 1-1-19 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.,Pharmaceutical & Healthcare Research Laboratories Research & Development Management Headquarters, FujiFilm Corporation, 577 Ushizima, Kaisei-cho, Ashigarakami-gun, Kanagawa 258-8577, Japan
| | - Atsuko Yamauchi-Ohguchi
- Pharmaceutical & Healthcare Research Laboratories Research & Development Management Headquarters, FujiFilm Corporation, 577 Ushizima, Kaisei-cho, Ashigarakami-gun, Kanagawa 258-8577, Japan
| | - Sayaka Kenmochi
- Pharmaceutical & Healthcare Research Laboratories Research & Development Management Headquarters, FujiFilm Corporation, 577 Ushizima, Kaisei-cho, Ashigarakami-gun, Kanagawa 258-8577, Japan
| | - Chihaya Kakinuma
- Department of Human Pathology, School of Medicine, Juntendo University, 1-1-19 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.,Pharmaceutical & Healthcare Research Laboratories Research & Development Management Headquarters, FujiFilm Corporation, 577 Ushizima, Kaisei-cho, Ashigarakami-gun, Kanagawa 258-8577, Japan
| | - Takashi Yao
- Department of Human Pathology, School of Medicine, Juntendo University, 1-1-19 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
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Chufal SS, Chufal KS, Pant P, Rizvi G, Pandey HS, Shahi KS. Hypercellular round cell liposarcoma: A comprehensive cytomorphologic study and review of 8 cases. J Cytol 2017; 34:78-83. [PMID: 28469314 PMCID: PMC5398024 DOI: 10.4103/0970-9371.203574] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Background: Myxoid and round cell liposarcomas (RCL) are low and high-grade counterparts of a common subtype of liposarcomas (LPS), representing a histologic continuum. Aims: The aim was to study the cytomorphology of hypercellular RCL and to look for features that differentiate RCL from other sarcomas displaying round cells with myxoid change. Materials and Methods: Eight cases of hypercellular RCL were identified retrospectively in which round cell component constituted greater than 75% of the area. Cytomorphological features were studied in detail. Results: Four cases were predominantly composed of round cells, out of which 2 were entirely composed of round cells. Myxoid metachromatic stroma was absent in 2 cases, while it was present in ample amounts in the remaining 6 cases. Spindle cells were completely absent in 5 cases and lipoblasts were observed in a single case of RCL. Plexiform vascular capillaries were seen in 4 cases. Adherence of neoplastic round cells around thin capillaries (ANAC) was observed in 7 cases. Conclusions: Plexiform capillary plexus and ANAC should be separately evaluated. The latter feature is the most consistent one, and is an important clue to the adipocytic nature of the neoplasm when hypercellular round cell areas are aspirated. Confident diagnosis of hypercellular RCL can be made on the basis of this feature. Lipoblasts, although specific, are seen in few cases. The rest of the features are nonspecific and useful only in combination.
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Affiliation(s)
- Sanjay S Chufal
- Department of Pathology, Government Medical College, Haldwani, Uttarakhand, India
| | - Kundan S Chufal
- Department of Radiation Oncology, Batra Hospital and Research Centre, New Delhi, India
| | - Prabhat Pant
- Department of Pathology, Government Medical College, Haldwani, Uttarakhand, India
| | - Ghazala Rizvi
- Department of Pathology, Government Medical College, Haldwani, Uttarakhand, India
| | - Hari S Pandey
- Department of Pathology, Government Medical College, Haldwani, Uttarakhand, India
| | - Kedar S Shahi
- Department of Surgery, Radiation and Clinical Oncology, Government Medical College, Haldwani, Uttarakhand, India
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