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MRI of bilateral bipartite hamulus: a case report
1Ullevål University Hospital, MRI section, Oslo, Norway.
Surgical and Radiologic Anatomy : SRA
|October 27, 1998
Summary
Bipartite hamulus, a normal carpal bone variant, can be incidentally found on wrist MR imaging. This case report highlights its appearance and differentiates it from fractures.
Area of Science:
- Radiology
- Anatomy
- Orthopedics
Background:
- Normal skeletal variants can be mistaken for pathology.
- Carpal tunnel investigations often involve wrist magnetic resonance (MR) imaging.
Observation:
- Incidental bilateral bipartite hamulus detected in an asymptomatic participant during wrist MR imaging.
- The anomaly presented with consistent MRI characteristics on spin echo (SE), turbo spin echo (TSE), and fast field echo (FFE) sequences.
- Congenital origin was inferred due to the absence of wrist trauma or surgery.
Findings:
- The bipartite hamulus is a rare anatomical variant of the hamate bone.
- MR imaging, particularly contiguous axial slices, reliably demonstrates this variant.
- This variant can be misdiagnosed as a fracture or post-traumatic injury.
Implications:
- Awareness of the bipartite hamulus is crucial for radiologists and clinicians to avoid misinterpretation.
- Accurate identification of this variant prevents unnecessary patient anxiety and interventions.
- This case contributes to the understanding of normal carpal variants in MR imaging.
