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Endobronchial Primary Pulmonary Angiomatoid Fibrous Histiocytoma in a Patient with Testicular Germ Cell Tumor: An Evidence Against Somatic Transformation
(Sage Publications Inc, 2022) Cetin, Mehmet; Katipoglu, Kubra; Turk, Ilteris; Ozkara, Seref; Kosemehmetoglu, Kemal; Bicakcioglu, Pinar
Primary Pulmonary Angiomatoid Fibrous Histiocytoma is a recently described soft tissue tumor with challenging differential diagnosis both clinically and pathologically due to its rarity in this location. It may also occur as a secondary malignancy and its occurrence either as a somatic malignancy arising in the germ cell tumor or as a secondary malignancy after chemotherapy is questionable. In this report, we present a 29-year-old male patient with a mass in the lower lobe of the left lung, who underwent orchiectomy and received adjuvant chemotherapy due to a mixed germ cell tumor 8 years ago. Morphology, immunophenotype, and molecular findings were consistent with the diagnosis of primary pulmonary angiomatoid fibrous histiocytoma. Fluorescent in situ hybridization was unable to demonstrate the presence of 12p amplification or isochromosome 12p, which is known as the key event in the development of testicular germ cell neoplasia even present in somatic malignancies arising in germ cell tumors. Our results support that angiomatoid fibrous histiocytoma arising as a secondary malignancy does not represent the somatic transformation of germ cell tumors.