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SEER Inquiry System - Report
Produced: 01/09/2026 2:11 PM
Question 20180040
Inquiry Details
References:
#1: WHO Class Urinary Tumors, 56. 4th ed.
#2: 2015 SEER Manual, 11
Question:
Reportability--Kidney: Is congenital cellular mesoblastic nephroma reportable for a newborn baby? See discussion.
Discussion:
2015 Rt kidney nephrectomy pathology states: congenital cellular mesoblastic nephroma, tumor sz 5.9cm, tumor limited to kidney, extension into pelvicalyceal system, margin not applicable, LVI negative. Per PubMed.gov: (In newborns) among the low-grade malignant tumors, congenital mesoblastic nephromas can be successfully treated with simple nephrectomy. Per ScienceDirect: ...currently thought that cellular mesoblastic nephroma is actually a renal variant of infantile fibrosarcoma.
Answer:
Do not report congenital mesoblastic nephroma (8960/1). Congenital mesoblastic mephromas are low-grade fibroblastic neoplasms of the infantile renal sinus according to WHO Classification of Tumors of the Urinary System and Male Genital Organs. The WHO classification is the standard used to determine behavior and histology for entities not listed in ICD-O-3.
