... × 8 cm and pathological diagnosis was primary Ewing's sarcoma. The patient was treated with conventional chemotherapy for 1 year after surgery, at which time multiple metastases were found. From this case, we surmise that hormonal changes that occur during pregnancy may accelerate the growth...

...Mototsugu Oya; Jun Nakashima; Taketsugu Ishii; Kaoru Nakamura; Jun-Ichi Hata; Hiroshi Tazaki We report a case of extraskeletal Ewing’s sarcoma arising in the retroperitoneal cavity. The tumor was excised en bloc with the left kidney and infiltrated portion of the left ureter. Histological diagnosis...

... investigations, today most authors define PNET as part of the same nosologic entity as Ewing’s sarcoma. We present the case of a 22-year-old man with a PNET arising from the kidney with, to our knowledge, a previously undescribed finding of hyaline cells within the tumor. © 2005 S. Karger AG, Basel 2005...

...Nathan Lawrentschuk; Sree Appu; Ian Chao; Yee Chan; John Rogerson; Ian D. Davis In the genitourinary tract, masses in the seminal vesicles, particularly primary tumors, are an unusual event. One must consider all diagnoses including Ewing’s sarcoma or its variant, peripheral primitive...