Objetivo general: Evaluar la respuesta histopatológica en los pacientes con nefroblastoma tratados con quimioterapia neoadyuvante en el Instituto Nacional de Enfermedades Neoplásicas entre el 2014 y 2019. El tumor de Wilms o nefroblastoma es una neoplasia originada en células blastemales nefrógenas, estos tumores replican histológicamente diversos estadios de maduración renal. En el mundo el diagnóstico de nefroblastoma se da en aproximadamente uno de 8000 a 10000 niños, siendo ligeramente mayor en americanos y africanos y menor en asiáticos; es considerado, en algunos lugares, como el tumor más frecuente de la edad pediátrica. El 98% de los casos se presenta en menores de 10 años, siendo el promedio de edad al momento del diagnóstico 3.0 años en varones y 3.5 años en mujeres. No presenta predilección por algún sexo, ocurriendo con la misma frecuencia en ambos. La incide...

Cecal appendix adenocarcinoma occurs in approximately 0.1% to 0.2% of all appendectomies. One subtype, mucinous adenocarcinoma, represents 0.08% of all neoplasms. Diagnosis is usually incidental and surgery is the best treatment option. We describe the case of a 55-year-old male patient, evaluated for severe pain in the right iliac fossa, who was found to have an appendiceal mass during open appendectomy. A fragmented appendix measuring 7 x 1.8 x 0.8cm, with mucoid content in its lumen; as well as mucin pools in more than 50% of the sample and signet ring cells in light microscopy, revealed the pathological diagnosis of mucinous adenocarcinoma. Therefore, the pathological analysis of surgical pieces is transcendental, since there are infrequent diagnoses that can change the prognosis and course of clinical management of a patient.

Introduction: Endometriosis is a chronic gynecological disease, which refers to the presence of endometrial glands and stroma outside the uterine endometrium. This entity has a frequency of 10 to 15% in women of reproductive age, and its most common site of presentation is the ovary. At the extrapelvic level, the most common location is the gastrointestinal and genitourinary location. However, it can occur in any location. Presentation: The case of a 40-year-old female patient with a face tumor in the mandibular region is described, presenting with a disease time of 2 years. Among the important antecedents, two months before the appearance of the tumor region, the patient underwent endodontic surgery of a lower molar tooth, contiguous to the mandibular. Likewise, one month before the appearance of the tumor, the patient underwent an exploratory laparoscopy for electrofulgu...