Bilateral testicular infiltration as the initial presentation of NRAS-mutant juvenile myelomonocytic leukemia: rapid molecular remission following azacitidine and haploidentical stem cell transplantation.

Authors

Yousef VatanParast

Published in

Leukemia research reports. Volume 26. Pages 100601. Epub Jul 23, 2026.

Abstract

Juvenile myelomonocytic leukemia (JMML) rarely manifests with extramedullary involvement beyond spleen, liver, or skin; testicular infiltration at diagnosis is unreported. We describe a Novel Case of bilateral testicular leukemic infiltration as the initial presentation of NRAS-mutant JMML in a toddler, with rapid remission following azacitidine bridging and haploidentical HSCT.
A 2-year-old boy presented with pallor, abdominal distension, and bilateral scrotal swelling. Labs: leukocytosis (58 × 10⁹/L, monocytes 12.8 × 10⁹/L), anemia (Hb 8.2 g/dL), HbF 22%. BM confirmed JMML with NRAS p.G12D (VAF 42%). No pathogenic variants were detected in KRAS, PTPN11, CBL, or NF1. Conventional cytogenetic analysis demonstrated a normal male karyotype (46,XY). US: testes enlarged (18.8/18.2 mL) with hypoechoic infiltration. Azacitidine (75 mg/m²/d × 5, 2 cycles) reduced counts and size. Paternal haplo-HSCT (Flu-Treo-TT conditioning, PTCy) engrafted D + 18; testes normal at 6 weeks, molecular remission (NRAS-) at 3 months.
This novel case underscores the efficacy of azacitidine and haploidentical HSCT for NRAS-mutant JMML with testicular involvement. Routine genital examination and ultrasound are recommended for male patients.

PMID:
42568796
Bibliographic data and abstract were imported from PubMed on 08 Aug 2026.

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