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Published on: July 28, 2013
A skeletally immature patient with Diamond-Blackfan anemia with Deferoxamine induced bone dysplasia: An analysis on
Sarah L Lu1, Camilo Perdomo-Luna2, Samuel A Beber1
1Department of Pediatric Orthopedics, Hospital for Special Surgery, Lerner's Children Pavillion, St Main Hospital, 535 E 70Th, New York, NY, 10021, USA.
Insights
Deferoxamine-induced bone dysplasia can cause growth disturbances. Diffusion tensor imaging (DTI) revealed preserved physeal microarchitecture in a child, suggesting DTI can assess growth plate function for surgical candidacy.
Area of Science:
- Pediatric Orthopedics
- Radiology
- Medical Imaging
Background:
- Deferoxamine-induced bone dysplasia is a rare complication of iron chelation therapy, affecting metaphyseal development and growth.
- Conventional imaging inadequately assesses physeal (growth plate) involvement in this condition.
- Diffusion tensor imaging (DTI) offers microstructural evaluation of tissue architecture, potentially clarifying physeal integrity.
Purpose of the Study:
- To evaluate the utility of Diffusion Tensor Imaging (DTI) in assessing physeal integrity in a pediatric patient with Deferoxamine-induced bone dysplasia.
- To determine if DTI can provide insights into physeal function despite metaphyseal abnormalities seen on conventional MRI.
- To assess the potential role of DTI in surgical candidacy evaluation for growth disturbances.
Main Methods:
- Case report of a 9-year-old male with Diamond-Blackfan anemia undergoing chronic deferoxamine therapy.
- Conventional MRI revealed metaphyseal abnormalities suggestive of bone dysplasia.
- DTI of the knees was performed to assess physeal microstructure and integrity prior to guided growth surgery.
Main Results:
- Tractography demonstrated preserved bilateral physeal tracts with specific volume and length measurements.
- Despite metaphyseal abnormalities, DTI metrics (volume, fractional anisotropy) indicated ongoing physeal activity.
- The patient underwent successful hemiepiphysiodesis with improved limb alignment.
Conclusions:
- DTI successfully visualized preserved physeal microarchitecture in a case of Deferoxamine-induced bone dysplasia, despite significant metaphyseal changes.
- DTI tractography may be a valuable tool for assessing physeal function and guiding surgical decisions in pediatric growth disturbances.
- This is the first reported use of DTI in Deferoxamine-induced bone dysplasia, highlighting its potential diagnostic and prognostic value.
Abstract:
Deferoxamine-induced bone dysplasia is a rare but clinically significant complication of chronic iron chelation therapy, characterized by metaphyseal abnormalities and growth disturbances. While conventional imaging demonstrates abnormal endochondral ossification, the extent of physeal involvement remains poorly understood. Diffusion tensor imaging (DTI) enables microstructural evaluation of physeal architecture and may provide additional insight beyond routine MRI. We report a 9-year-old skeletally immature male with Diamond-Blackfan anemia treated with chronic deferoxamine iron chelation therapy who presented with bilateral genu valgum confirmed on alignment radiographs. MRI revealed multiple metaphyseal cartilage tongues with areas of abnormal ossification in both distal femurs. DTI of both knees was performed to assess physeal integrity prior to guided growth surgery. Tractography demonstrated preserved bilateral physeal tracts with femoral physeal volumes of 15.9 mL (left) and 13.0 mL (right), and mean tract lengths of 6.9 ± 4.0 mm and 6.4 ± 3.3 mm, respectively. Despite metaphyseal abnormalities, tract volume and fractional anisotropy values suggested ongoing physeal activity. The patient subsequently underwent bilateral hemiepiphysiodesis with early postoperative improvement in alignment. In this case of deferoxamine-associated bone dysplasia, DTI demonstrated preserved physeal microarchitecture despite marked metaphyseal abnormalities on conventional MRI. Thus, DTI tractography may serve as a useful adjunct in evaluating physeal function and surgical candidacy in pediatric patients with growth disturbances. To the best of our knowledge, this is the first reported use of DTI in this condition and suggests a potential role for assessing physeal function and surgical candidacy in pediatric growth disturbances.
