Oncology Flashcards Preview

Pediatrics > Oncology > Flashcards

Flashcards in Oncology Deck (14):
1

Leukemia

malignancy of lymphocytic or myeloblastic origin. Most common childhood malignancy.

97% of cases are acute leukemia (ALL more than AML).

ALL is most common in male white kids btw 2 and 5 years old.

AML is seen in black kids more throughout childhood

Associated with Down Syndrome, Fanconi anemia, prior radiation, SCID, and congenital bone marrow failure states

ALL is the most common childhood malignancy followed by CNS tumors and lymphomas

2

History and exam for leukemia

1) Symptoms are abrupt in onset. They are initially nonspecific (anorexia, fatigue) and are followed by bone pain with limp or refusal to bear weight, fever (from neutropenia), anemia, ecchymoses, petechiae, and/or HSM

2) CNS mets may be associated with HA, vomiting, and papilledema

3) AML can present with a chloroma, a greenish soft-tissue tumor on skin or spinal cord

3

Dx of leukemia

1) CBC, coagulation studies, and blood smear which shows high numbers of blasts (lymphoblasts found in 90% of cases). WBC counts can be low, normal or high

2) A bone marrow sample for immunophenotyping (TdT assay and a panel of monoclonal antibodies to T and B cell antigens) and genetic analysis help confirm the dx. The dx is made if bone marrow is hypercellular with increased lymphoblasts

3) CXR to rule out mediastinal mass

4

Tx of leukemia

1) Chemo based, including induction, consolidation and maintenance phases

2) Tumor Lysis Syndrome (watch out for it at onset of any chemo regimen): HyperK, HyperP, Hyperuricemia is common prior to and during initiation of treatment. Treat with fluids, diuretics, allopurinol, urine alkalinization and reduction of phosphate intake. Steroids are contraindicated bc they can precipitate tumor lysis syndrome

5

Neuroblastoma

An embryonal tumor of neural crest origin. More than half of patients are less than 2 years of age and 70% have distant mets at presentation

Associated with neurofibromatosis, Hirschsprung's and N-myc oncogene

6

History and exam for neuroblastoma

1) lession sites are most commonly abdominal, thoracic, and cervical

2) Symptoms may vary with location and may include a nontender abdominal mass (may cross midline*), Horner's, HTN, or cord compression (from a paraspinal tumor)

3) Patients may have anemia, FTT, and fever

4) More than half will have mets at presentation. Signs include bone marrow suppression, proptosis, hepatomegaly, subQ nodules, and opsoclonus/myoclonus

7

Dx of neuroblastoma

1) CT scan; FNA of tumor. Histologically appears as small, round, blue tumor cells with a characteristic rosette pattern

2) Elevated 24h urinary catecholamines (VMA and HVA)

3) Bone scan and bone marrow aspirate

4) CBC, LFTs, coagulation panel, BUN/Cr

8

Tx of neuroblastoma

Local excision plus postsurgical chemo and/or radiation

9

Wilm's Tumor

A renal tumor of embryonal origin that is most commonly seen in children 2-5 years of age. Associated with Beckwith-Wiedemann Syndrome (hemi-hypertrophy, macroglossia, visceromegaly), neurofibromatosis, and WAGR syndrome (Wilms, Aniridia, GU abnormalities, mental Retarded)

10

History and exam for Wilm's

1) Presents as an ASx, nontender, smooth abdominal mass that does not usually cross the midline**

2) Abdominal pain, fever, HTN, and microscopic or gross hematuria are seen

11

Dx of Wilm's

1) CBC, BUN, Cr and UA

2) Abdominal US

3) CT scans of the chest and abdomen are used to detect mets

12

Tx of Wilm's

Local resection and nephrectomy with postsurgical chemo and radiation depending on stage and histology

13

Ewing's Sarcoma

1) Origin: Sarcoma (neuroectoderm); associated with chromosome 11:22 translocation

2) Epi: Commonly seen in white male adolescents

3) History and exam: Local pain and swelling, systemic symptoms (fever, anorexia, fatigue) are common

4) Location: Midshaft of long bones (femur, pelvis, fibula, humerus)

5) Dx: Leukocytosis, high ESR, Lytic bone lesion with onion skin periosteal reaction on plain XR

6) Tx: Local excision, chemo, radiation

14

Osteosarcoma

1) Origin: Osteoblasts (mesenchyme)

2) Epi: Commonly seen in male adolescents

3) History and exam: Local pain and swelling. Systemic symptoms rare

4) Location: Metaphyses of long bones (distal femur, proximal tibia, prox humerus). Mets to lungs in 20%

5) Dx: Increased Alk Phos. Sunburst lytic bone lesions. Chest CT to rule out pulmonary mets

6) Tx: Local excision, chemo