4. Wilm’s Tumor (Nephroblastoma)
The second most common solid intra-
abdominal malignant tumor in children.
Commonest renal mass in children
Peak incidence: 3-5 years of age.
5. Wilm’s Tumour: Pathology
Derived from primitive metanephric
blastema cells.
Histopathology: Triphasic (three cell types)
stromal, epithelial, and blastemal. Thus
may contain tissue not found in the normal
kidney eg. Skeletal, muscles, cartilage and
squamous epithelium.
7. Diagnosed by the
presence of a
solid, intrarenal
mass causing
intrinsic distortion
of the calyceal
collecting system.
Metastases: lung,
occasionally liver.
Wilm’s Tumor
8. Wilm’s Tumor: Presentation
Presentation: abdominal (flank) mass +/-
pain, fever.
Other presentations: malaise, weight loss,
anemia, hematuria, left varicocele and
hypertension.
14. Staging by National Wilm’s Tumor
Study Group:
Stage I: Tumor limited to kidney and
completely resected.
Stage II: Tumor extends beyond the
kidney but completely excised.
Stage III: Residual non-hematogenous
tumor confined to the abdomen.
Stage IV: Hematogenous metastasis.
Stage V: Bilateral tumors.
15. Wilm’s Tumour: Treatment
Surgical Excision followed by Chemotherapy +/-
Radiotherapy according to the stage and histology
(favorable or unfavorable).
Aim of surgery: Radical nephrectomy without
spillage + accurate staging (spread of disease).
Chemotherapy commonly used: Actinomycin D
(A), Vincristine (V), Doxorubicin (D), Cytoxan (C).
16. Wilm’s Tumour: NWTS-4 treatment
STAGE HISTOLOGY NEPHRE
CTOMY
CHEMO
THERAPY
RADIO
THERAPY
I FV, UFV + A, V NO
II FV + A, V NO
III, IV FV + A, V, D YES
II, III, IV UFV + A, V, D +/-
C
YES
18. Wilm’s Tumor : Prognosis
Disease-free survival is 95% for Stage I
and approximately 77% for all patients.
Good prognosis:
-Stage I & II
-Para-aortic LN: -ve
-Favorable histology
-No tumor ruptured during surgery
19. Congenital Mesoblastic Nephroma
presents in infants < 30 days of age
(< 6 months), is commonly benign
and invasive locally.
Operative removal is curative.
Ruptured of tumor increases
recurrences.
Chemo and radiotherapy are not
indicated.
Mesoblastic Nephroma
20. Neuroblastoma
most common extracranial solid tumor
of childhood.
8-10% of all pediatric malignancies
Median age at diagnosis is 2 years.
Arises from the adrenals or sympathetic
chain
Higher frequency seen in certain
syndromes (Myoclonus-opsoclonus
syndrome ,Watery diarrhea )
21. Pathology
“Small round blue cell” tumors
Originates from neural crest cells in the sympathetic
nervous system
Arises from the adrenals or sympathetic chain
3 subgroups
Neuroblastoma- most primitive
Ganglioneuroma- benign and mature
Ganglioneuroblastoma- in between
Secrete neurogenically derived substance
Urinary catecholamines in 75-90%
*VMA & HVA
Others
*Neuron specific enolase (NSE)
*Ferritin
22. Pathology : Pseudorosettes
Shimada Classification:
favorable histology&
unfavorable histology
NBL metastasized to the
bone marrow
Clumps of tumor cells
23. Cytogenetics
Chromosomal abnormalities in most
cases of NBL
N-myc amplification (normally 2 copies)
>10 copies/cell
30% of NBL
Poor prognosis
Ploidy
Hyperdiploid = DNA index > 1.0
Good prognosis, at least in those < 2 years
24. Presentation
Variable
Median age is 2 years, so S/S are vague
Constitutional
Fever, malaise, irritability
Mass
Posterior mediastinal mass on CXR(esp in infants)
Palpable abdominal mass
Hard, painless mass in the neck
Mass effect, dependent on location
Abd pain/obstruction
Lower limb paresis from a paraspinal tumor
32. Treatment
Surgery
Localized tumors that don’t encase vasculature
Complete resection = excellent chance for cure
Palliative treatment for tumors compressing vital
organs
Chemotherapy
The mainstay of therapy since most are metastatic
May be very intensive requiring stem cell rescue
Radiation
Used for localized but unresectable tumor (stage III)
Control of tumor that is unresponsive to chemo
43. Hepatoblastoma: Treatment
Surgery + Chemotherapy +/- Radiotherapy
Surgery: Optimum treatment is complete
resection.
Chemotherapy:
*Adjuvant following resection.
*Pre-operative for non-resectable.
*Palliative for metastatic disease.
Radiotherapy: for non-resectable tumor to
reduce its size.
46. Teratoma
Arises from Totipotent cells thus contains tissues
(bone, teeth, cartilage, hair and fat) foreign to
the site of origin.
Commonest site: Sacrococcygeal.
Other sites: Gonads, Retro-peritoneal,
Cervical.
Solid, cystic or mixed.
Benign or Malignant from the start .
High incidence of malignant transformation if not
resected.
52. Ovarian tumours
Uncommon childhood malignancies (1%)
Presents as an Abdominal Mass or Acute
Abdomen in cases of torsion.
Common histology is germ cell:
dysgerminoma, teratoma, and endodermal
sinus tumor.
Other: Epithelial (older adolescent), lipid-
cell, and gonadoblastoma.
58. Intestinal Lymphoma
Presents as an Abdominal Mass.
High incidence of Burkitt’s Lymphoma.
Diagnosis: U.S. and C.T.
Treatment: Chemotherapy
Surgery is only indicated if patient
presents with intestinal obstruction.
64. Ovarian Cyst
Mostly functional and presents in the
neonatal period.
Can be diagnosed antenatally.
Liable for torsion.
Diagnosis: U.S ,C.T
Treatment is surgical excision of the cyst if
its size exceeds 4 to 5 cm.
69. Liver Cysts
Mesenchymal Hamartoma and Solitery
Liver Cyst.
Presents in the first year of life as a rapidly
growing abdominal mass.
Diagnosis: U.S. and C.T.
Treatment: Excision.
73. Hydronephrosis
Commonest cystic abdominal swelling.
May be due to U.P.J., P.U.V., Megaureter,
V.U.Reflux.
Diagnosis: U.S., Isotope scan
Treatment: according to the cause.