Retroperitoneal extraskeletal ewing's sarcoma difficult to differentiate from adrenocortical carcinoma: A case report

Masahiko Sato, Minoru Miyazato, Shigeyuki Yamada, Shuichi Shimada, Yasuhiro Kaiho, Shigeto Ishidoya, Yoichi Arai

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3 Citations (Scopus)


A 15-year-old man complained of left upper abdominal distention. Ultrasonography, computed tomography, and magnetic resonance imaging (MRI) revealed a large multilocular tumor measuring 15×10 × 14 cm in the left retroperitoneal space. MRI showed the high intensity tumor on the T1 and T2 weighted images and enhanced septum above the left kidney. Positron emission tomography revealed high uptake (SUV max 7.9) in the marginal region. Because the left adrenal gland could not be identified on images, we diagnosed the tumor as adrenocortical carcinoma, preoperatively. In February 2010, tumor excision combined with left nephrectomy and adrenalectomy was performed via transperitoneal approach. Left adrenal gland was identified separately from the tumor, but a small tumor was observed in the gland. The pathological specimen showed sheet-like monotonous proliferation of small round cells which had glycogen. Immunostaining technique showed highly positive CD-99 and neuron specific enolasc (NSFJ). Fluorescence in situ hybridization (FISH) showed translocation of EWS gene. Similar pathological findings were observed in the left adrenal tumor. We diagnosed the tumor as retroperitoneal extraskelctal Ewing's sarcoma with metastasis to the left adrenal gland. Considering it a high risk, wc started adjuvant VAIA (vincristine, dactinomycin, ifosfamide, and doxorubicin) chemotherapy soon after the operation. However, there was left retroperitoneal recurrence 9 months after the operation. We changed the chemotherapy regimen to gemcitabine and docetaxel and are continuing chemotherapy.

Original languageEnglish
Pages (from-to)303-307
Number of pages5
JournalActa Urologica Japonica
Issue number6
Publication statusPublished - 2011 Jun 30


  • Extraskelctal ewing's sarcoma
  • Retroperitoneal space

ASJC Scopus subject areas

  • Urology


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