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Gastrointestinal stromal tumor presenting as a hormonally inactive adrenal mass

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Abstract

Gastrointestinal stromal tumors (GISTs) are the most common mesenchymal tumors of the gastrointestinal tract. Rarely, tumors with the same histological and immunohistochemical features arise in organs having no connection to the tubular gastrointestinal tract designated as extragastrointestinal stromal tumors (EGISTs). In this article, we report the first case of an EGIST presenting as a hormonally inactive adrenal mass. A 68-year-old woman with a 3-month history of right abdominal pain was clinically diagnosed as having a hormonally inactive right adrenal tumor sizing 15 cm in diameter. This mass and the tightly fixed right adrenal gland were resected en bloc. Histologically, the tumor was composed primarily of monomorphic spindle cells. Mitotic figure was 2–3 per 50 high power fields. Immunohistochemical analysis revealed strong positivity for CD117 (c-KIT) and smooth muscle actin (α-SMA), but negativity for beta-catenin, CD34, pan-keratin, S-100, desmin, and H-caldesmon. Genetic analysis showed no mutations in KIT gene exons 9, 11, 13, and 17, and in exon 18 of the platelet-derived growth factor-2 receptor gene (PDGFR). The patient proved to be tumor free at the 18-month follow-up. This case under study demonstrates that EGIST should be included in the differential diagnosis of hormonally inactive adrenal tumors. CD117 (c-KIT) immunohistochemistry should be applied in the pathological workup of soft tissue adrenal tumors. This case is an additional example suggesting that the prognosis of even a very large EGIST is not definitely grave.

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Authors and Affiliations

  1. 2nd Department of Medicine, Semmelweis University, Szentkirályi u. 46, Budapest, 1088, Hungary

    Márta Sereg, Éva Csöregh, Zsuzsa Jakab, Károly Rácz & Miklós Tóth

  2. 1st Department of Pathology, Semmelweis University, Budapest, Hungary

    Zoltán Sápi

  3. Department of Urology, Péterfy Sándor Street Hospital, Budapest, Hungary

    István Buzogány

  4. Department of Pathology, Péterfy Sándor Street Hospital, Budapest, Hungary

    Gábor Gonda

Authors
  1. Márta Sereg
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  2. István Buzogány
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  3. Gábor Gonda
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  4. Zoltán Sápi
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  5. Éva Csöregh
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  6. Zsuzsa Jakab
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  8. Miklós Tóth
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Correspondence to Miklós Tóth.

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Sereg, M., Buzogány, I., Gonda, G. et al. Gastrointestinal stromal tumor presenting as a hormonally inactive adrenal mass. Endocr 39, 1–5 (2011). https://doi.org/10.1007/s12020-010-9406-5

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  • DOI: https://doi.org/10.1007/s12020-010-9406-5

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