- Published on
Pathology - Pediatric kidney neoplasms
Nephroblastoma (Wilms' tumor) is a malignant kidney neoplasm occurring in children. • The second most prevalent pediatric cancer, occurring at an incidence of approximately 1 in 8,000. • The majority of children aged 2 to 5 years exhibit an abdominal mass. Macroscopically, they are distinctly defined tumors with a grey or tan hue. Histologically, the majority of nephroblastomas comprise a combination of undifferentiated small round blue cells (blastema) and regions of highly differentiated epithelial and stromal elements, referred to as 'triphasic' tumors. Most nephroblastomas are classified as low stage with favorable histology, resulting in an excellent prognosis following treatment. Approximately 5% of cases have unfavorable histology, marked by nuclear anaplasia or the presence of multipolar mitotic figures; these instances are linked to a negative prognosis.
Clear cell sarcoma -A rare pediatric renal sarcoma with a significant tendency to metastasis to bone. • The majority of youngsters present between the ages of 1 and 2 years. Macroscopically, they are generally substantial tumors located in the renal medulla. • Histologically, the typical pattern consists of nests or cords of cells interspersed with fibrovascular septa.
Rhabdoid tumor: A rare, extremely aggressive kidney neoplasm occurring in young children. • Typically manifests at one year of age with either hematuria or symptoms indicative of disseminated illness. The tumors are big and infiltrative, with patches of necrosis. The malignant cells exhibit vesicular chromatin, large cherry-red nucleoli, and hyaline pink intracytoplasmic inclusions histologically. Significant vascular invasion is typically apparent. • The prognosis is exceedingly unfavorable, with fatality rates exceeding 80% within two years following diagnosis.
Congenital mesoblastic nephroma • A low-grade fibrolastic renal sarcoma occurring in pediatric patients. • It may be identified via prenatal ultrasound or manifest within the first year of life as an abdominal tumor. • The tumor is predominantly located in the renal sinus and exhibits either a firm whorled morphology or a softer cystic cut surface. Histologically, two forms are identified: a 'classic' type consisting of fascicles of benign spindle cells and a 'cellular' type including sheets of densely packed rounded cells. • The prognosis is often outstanding when the tumor is entirely removed with nephrectomy.
Nephroblastoma (Wilms' tumor) is a malignant kidney neoplasm occurring in children. • The second most prevalent pediatric cancer, occurring at an incidence of approximately 1 in 8,000. • The majority of children aged 2 to 5 years exhibit an abdominal mass. Macroscopically, they are distinctly defined tumors with a grey or tan hue. Histologically, the majority of nephroblastomas comprise a combination of undifferentiated small round blue cells (blastema) and regions of highly differentiated epithelial and stromal elements, referred to as 'triphasic' tumors. Most nephroblastomas are classified as low stage with favorable histology, resulting in an excellent prognosis following treatment. Approximately 5% of cases have unfavorable histology, marked by nuclear anaplasia or the presence of multipolar mitotic figures; these instances are linked to a negative prognosis.
Clear cell sarcoma -A rare pediatric renal sarcoma with a significant tendency to metastasis to bone. • The majority of youngsters present between the ages of 1 and 2 years. Macroscopically, they are generally substantial tumors located in the renal medulla. • Histologically, the typical pattern consists of nests or cords of cells interspersed with fibrovascular septa.
Rhabdoid tumor: A rare, extremely aggressive kidney neoplasm occurring in young children. • Typically manifests at one year of age with either hematuria or symptoms indicative of disseminated illness. The tumors are big and infiltrative, with patches of necrosis. The malignant cells exhibit vesicular chromatin, large cherry-red nucleoli, and hyaline pink intracytoplasmic inclusions histologically. Significant vascular invasion is typically apparent. • The prognosis is exceedingly unfavorable, with fatality rates exceeding 80% within two years following diagnosis.
Congenital mesoblastic nephroma • A low-grade fibrolastic renal sarcoma occurring in pediatric patients. • It may be identified via prenatal ultrasound or manifest within the first year of life as an abdominal tumor. • The tumor is predominantly located in the renal sinus and exhibits either a firm whorled morphology or a softer cystic cut surface. Histologically, two forms are identified: a 'classic' type consisting of fascicles of benign spindle cells and a 'cellular' type including sheets of densely packed rounded cells. • The prognosis is often outstanding when the tumor is entirely removed with nephrectomy.
0 Comments
