The Usefulness of T1-Weighted Magnetic Resonance Images for Diagnosis of Acute Leukemia Manifesting Musculoskeletal Symptoms prior to Appearance of Peripheral Blood Abnormalities

Humeral Diaphyseal Osteolytic Lesion as the Initial Presentation of Acute Myeloid Leukemia in a Child: A Case Report and Review of the Literature

It is well known that acute myeloid leukemia (AML) is characterized by lethargy, fever, pallor, and purpura. In children, however, skeletal symptoms may be present at onset in rare cases, and such cases tend to be misdiagnosed as osteomyelitis or septic arthritis. To distinguish acute leukemia from osteomyelitis or bone tumor, the utility of magnetic resonance imaging (MRI) has been discussed. We present a pediatric case of AML in which the initial manifestation was pain in a single bone, and the diagnosis was aided by bone marrow examination and MRI. A one-year-old male with AML presented with left humeral bone pain and intermittent fever. T1-weighted magnetic resonance imaging (T1WI) revealed diffuse low signal intensity in the bone marrow adjacent to the localized musculoskeletal symptoms. Despite a lack of blasts in the peripheral blood, the histopathological features of the bone focus suggested the need for an iliac crest bone marrow biopsy to obtain a definitive diagnosis. After the diagnosis of AML, the patient received induction and consolidation chemotherapy. He is currently alive in remission after a post-diagnosis follow-up of 36 months. To date, only seven pediatric cases of AML with skeletal symptoms at initial presentation have been reported, including the present one. In three cases, the skeletal lesion was observed at a single site, and the initial misdiagnosis was discitis, septic arthritis, or acute osteomyelitis. We suggest that AML should be considered as a differential diagnosis in children presenting with treatment-resistant single skeletal lesions. Not only MRI but also bone biopsy can yield diagnostically important information.

Magnetic resonance imaging as a diagnostic modality in a child with acute lymphoblastic leukemia

Acute lymphoblastic leukemia is the most common form of childhood cancer. It presents with nonspecific symptoms, such as bone pain, that can be easily misdiagnosed at initial presentation. We present a 2-year-old boy with bilateral foot pain that worsened over 6 months. X-rays of the feet showed no obvious abnormalities. Magnetic resonance imaging revealed abnormal bone marrow consistent with an infiltrative process. The patient was found to have precursor B-cell acute lymphoblastic leukemia. Cases such as these highlight the possible future use of magnetic resonance imaging in the early diagnostic workup for bone and muscle pain.

Prognostic impact of CD200 and CD56 expression in adult acute lymphoblastic leukemia patients

BACKGROUND

The aim of the study is to determine the prognostic relevance of CD200/ CD56 expression in adult acute lymphoblastic leukemia patients.

METHODS

The expression of CD200 and CD56 by blast cells was assessed by flow cytometry before the start of chemotherapy in 70 B-ALL patients.

RESULTS

Positive expression of CD200 was detected in forty-six patients (66%) and CD56 was detected in 7 patients (10%) out of 70 patients, respectively. Only three patients (4.3%) had co-expression for CD200⁺ and CD56⁺. Splenomegaly and thrombocytopenia were frequently observed more in CD200⁺ patients. Increased frequency of CD34⁺ was associated with CD200⁺and CD56⁺ patients. The CD200⁺ and CD56⁺ subgroups of B-ALL patients had inferior OS and disease free survival compared to CD 200^- and CD 56^- patients.

CONCLUSIONS

CD200⁺ and/or CD56⁺ positive expression in B-ALL patients at diagnosis is a poor prognostic biomarker. Identification of CD200⁺ and CD56⁺ expression at diagnosis is recommended for a better stratification of adult B-ALL patients.