9 topics with a brief review: definitions, key facts, and classroom questions.
Pediatric oncology is fundamentally different from adult oncology. In this chapter, we discuss the main features of tumors in children: the predominance of dysembryogenetic and mesenchymal neoplasms, a close association with developmental anomalies, and the unique ability of certain tumors to undergo spontaneous regression or maturation.
The section consistently covers key nosological entities. We will analyze the morphology of benign hemangiomas and teratomas, and then proceed to formidable embryonal malignant tumors: neuroblastoma, nephroblastoma (Wilms tumor), and retinoblastoma. The chapter concludes with aggressive musculoskeletal tumors—rhabdomyosarcoma and osteosarcoma.
What do you need to know for the class? Exams and seminars most frequently cover the nephroblastoma triad (microscopic structure), the difference between mature and immature teratomas, and the phenomenon of neuroblastoma "maturation." Pay special attention to the origins of development (tissue affiliation) and histological markers of each tumor—these are classic questions in exam tickets and tests.
This theory explains the development of tumors in children from embryonic tissue remnants that persisted due to intrauterine organogenesis disorders.
From which cells does a teratoma arise?
It develops from totipotent or pluripotent germ cells due to impaired normal migration during the formation of the embryonic gonads.
What does the tumor reversion phenomenon consist of?
Reversion is the unique ability of certain malignant embryonal neoplasms in children to mature and transform into benign tumors (for example, the transition of a neuroblastoma into a ganglioneuroma).
What are pseudorosettes and what are they characteristic of?
These are specific microscopic structures in which tumor cells form a ring around a central cluster of eosinophilic neurofibrils. They are characteristic of differentiating neuroblastomas.
At what age is the prognosis for neuroblastoma most favorable?
The best prognosis is observed in children under 1 year of age. The overall survival rate in this group is 85–90% regardless of the stage of the tumor process.
Where does retinoblastoma most frequently metastasize?
The tumor metastasizes hematogenously to the liver, cranial bones, and tubular bones. Lymphogenous metastasis affects the cervical, submandibular, and parotid lymph nodes.
Master the entire topic in the "Pathological Anatomy" course
This is a summary. The course covers everything tested in classes and exams.
4,414 pages of study guides covering all topics
Assignments and quizzes after every topic — just like in a colloquium