Fetus in fetu is a rare condition, which has fewer than 200 cases reported to date. It is mainly located in the retro peritoneum; but it can occur at other levels. Treatment is always surgical and early detection and extraction allows clinical improvement and the successful development of the affected child. We report the case of an 18 month infant who is carried by her mother to medical appointment due to low weight for that age. In the physical exam, doctor found mass in the left hypochondrium and epigastrium and a total abdominal ultrasound is requested. Ultrasound reports findings relating to right hydronephrosis, and excretory urography and a CT with contrast reveals fetus parasite located in retro peritoneum. The infant is taken to surgery for lysis of peritoneal adhesions, resection of retroperitoneal tumor, and ureterolysis nephropexy. After this, the infant presented good evolut...

Acute lymphoblastic leukemia is a common pediatric neoplasia, comprising 11% of all leukemias. In Colombia, the annual incidence in adults is 1 out of 100,000 people. Testicular relapse is rare (accounting for only 0.9-8.8% of all cases) and represents a sign of recurrence which can be confused with other testicular conditions. We report the case of a 23-yearold male with testicular pain and swelling for 2 months after a trauma, and a history of acute lymphoblastic leukemia treated 4 years before. A testicular ultrasound suggested tension hydrocele. The patient was taken to surgery where a testis with neoplastic features was observed. Therefore, an orchiectomy was performed. The pathological anatomy revealed a 12-cm mass consisting of infiltration by leukemic cells, showing a positive expression for CD19, CD10, and a negative expression for TdT. The testes are considered a sanctuary site...