BACKGROUND Patients with a primary pure seminoma in the testis who have elevated serum alpha-fetoprotein are rare and should be treated as patients with nonseminomatous germ cell tumors. However, nonpalpable testicular tumors in this condition have never been reported. We describe a case of nonpalpable pure testicular seminoma with elevated serum alpha-fetoprotein presenting retroperitoneal met...

Schwannomas usually occur in adults being between the second and fifth decades, and such neoplasms are extremely rare in a pediatric population. In addition, they are not normally found in the retroperitoneal region. Here, we present a pediatric case of a retroperitoneal schwannoma in an adrenal location where the tumor was not able to be preoperatively differentiated from other benign or malig...

Primary retroperitoneal mucinous cystic tumors with borderline malignancy are rarely encountered. To date, only 12 cases have been reported in the literature. In this report, we present an additional case. A 65-year-old nulliparous woman complained of abdominal fullness. Her medical history included a hysterectomy and a single salpingo-oophorectomy performed 25 years prior to the present event....

Ganglioneuromas are rare benign tumors of neural crest origin developed along the sympathetic chain. The pelvic retroperitoneum is the rarest location of these tumors. Clinically these tumors are commonly asypmtomatic even if they reach large sizes. Here we report the radiological features of a 16 year old boy with pathologically proven retroperitoneal ganglioneuroma that was detected initially...

Introduction. Retroperitoneal sarcomas are uncommon large malignant tumors. Methods. Forty-one consecutive patients with localized retroperitoneal sarcoma were retrospectively studied. Results. Median age was 58 years (range 20-91 years). Median tumor size was 17.5 cm (range 4-41 cm). Only 2 tumors were <5 cm. Most were liposarcoma (44%) and high-grade (59%). 59% were stage 3 and the rest was s...

Individuals with Down syndrome (DS) have a unique profile of neoplasms, with a higher incidence of leukemias and a lower incidence of solid tumors than seen in the general population. We recently encountered two cases of infants with DS with retroperitoneal teratoma. After reviewing the literature on teratomas in DS, we found that the incidence of retroperitoneal teratomas was higher and the in...

Lymphangiomas are rare benign tumors of lymphatic vascular origin. They more common in the pediatric population and manifest mainly neck axillary region. Retroperitoneal lymphangiomas less that 1% pancreatic origin is even rarer. We present a case cystic lymphangioma 60-year-old woman with chronic diffuse symptoms, diagnosed because newly onset diabetes mellitus. She was successfully managed di...

INTRODUCTION Lymphangiomas are rare, benign tumors. An intra-abdominal location of these lesions is rarer still and there are only a few reports describing laparoscopic resection for retroperitoneal lymphangiomas, especially in tumors that mimic pancreatic tumors. CASE PRESENTATION We present the case of an asymptomatic 30-year-old Japanese woman in whom a cystic tumor was found incidentally ...

Testicular tumors are the most common solid tumors reported in young males aged 15–35 years [1, 2]. These tumors frequently metastasize to retroperitoneal lymph nodes, but only 5% of these tumors seed the gastrointestinal (GI) tract [3, 4], with the duodenum being the least common site (1.4%) [4]. Local extension from the retroperitoneal lymph node into the GI tract is the common method of spre...

Soft tissue sarcomas represent less than 1% of all human neoplasms. One-third of malignant tumors that arise in the retroperitoneum are sarcomas and liposarcoma is the most common retroperitoneal sarcoma. More often than not, patients report late to the hospital due to the slow progress and few late symptoms. Thus, the tumor is known to grow to enormous sizes. Here, we report a case of giant re...