Journal of Pathology and Translational Medicine

Case Reports

Metaplastic Thymoma: Report of 4 Cases: Guhyun Kang, Nara Yoon, Joungho Han, Young Eun Kim, Tae Sung Kim, Kwhanmien Kim; Korean J Pathol. 2012;46(1):92-95. Published online February 23, 2012; DOI: https://doi.org/10.4132/KoreanJPathol.2012.46.1.92

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Metaplastic thymoma (MT), accepted in the World Health Organization 2004 scheme, is a circumscribed tumor of the thymus exhibiting biphasic morphology. We herein describe the clinicopathologic features of four MTs and the differential diagnoses of this unusual tumor. There were three women and one man with mean age of 49.5 years. The patients were found to have mediastinal masses, and underwent surgical excision. One exhibited symptoms of myasthenia gravis, and the serum titer for anti-acetylcholine receptor antibody was positive. Grossly, the tumors were encapsulated, and showed vaguely multinodular, solid, tan-white to yellow cut surfaces. Histologically, they comprised epithelial islands intertwining with bundles of delicate spindle cells. The patients remained well after surgical excision at 5-55 months. Because of the distinctive histological appearance and benign clinical course, MT should be distinguished from other more aggressive mediastinal neoplasms displaying biphasic feature.

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Modern Pathology.2023; 36(2): 100048. CrossRef
Significance of YAP1–MAML2 rearrangement and GTF2I mutation in the diagnosis and differential diagnosis of metaplastic thymoma
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Malignant Transformation of Metaplastic Thymoma into High-Grade Sarcomatoid Carcinoma: A Case Report
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International Journal of Surgical Pathology.2022; 30(5): 564. CrossRef
YAP1-MAML2 Fusion as a Diagnostic Biomarker for Metaplastic Thymoma
Jikai Zhao, Ruiying Zhao, Chan Xiang, Jinchen Shao, Lianying Guo, Yuchen Han
Frontiers in Oncology.2021;[Epub] CrossRef
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Type AB thymoma is not a mixed tumor of type A and type B thymomas, but a distinct type of thymoma
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Eiji MIYAHARA, Tomoko ITAGAKI, Masaki KUWAHARA, Akira KAMEDA, Yoshihiro MIYATA, Kazuhiro SENTANI, Wataru YASUI
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Thymofibrolipoma: A Brief Case Report.: Gu Hyun Kang, Joungho Han, Tae Sung Kim, Yong Soo Choi, Sang Won Um; Korean J Pathol. 2010;44(3):338-340.; DOI: https://doi.org/10.4132/KoreanJPathol.2010.44.3.338

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Abstract PDF

Thymofibrolipoma is an extremely rare tumor in the anterior mediastinum, and represents a histologic variant of the usual thymolipoma. Herein, we report a case of thymofibrolipoma in a 9-year-old girl who had a huge mass with fatty attenuation in the right hemithorax on chest computed tomography. She denied any subjective symptoms except mild fever. The surgically resected tumor was ovoid, soft and well-encapsulated, measuring 9.0 x 7.5 x 7.0 cm. The cut surface was light tan in color with yellowish streaks. Microscopically, two distinct areas were admixed in different proportions. One consisted of normal thymic tissue with subinvoluted features and the other was composed of extensive areas of collagenous tissue interspersed in mature adipose tissue. In a high power view, there were thin strands of remnant thymic epithelial cells, separating the pseudolobules. Thymofibrolipoma should be distinguished from other benign or malignant conditions, occurring in the anterior mediastinum, so that unnecessary treatment can be avoided.

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Unusual thymoma subtypes
Michael A. den Bakker
Diagnostic Histopathology.2023; 29(2): 105. CrossRef
Thymofibrolipoma: a case report and review of the literature
Ryu Jokoji, Emiko Tomita
Diagnostic Pathology.2022;[Epub] CrossRef
Thymoangiolipoma: A rare histologic variant of thymolipoma in a patient with myasthenia gravis
Mohammad Hossein Anbardar, Fatemeh Amirmoezi, Armin Amirian
Rare Tumors.2020;[Epub] CrossRef

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