25 years old post hand injury.
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Accessory ossicle distally to ulnar styloid known as lunula.
Base of 4th metacarpal bone fracture.
Lunula is accessory ossicle of the wrist lying distally to ulnar styloid as opposed to os triangulare which is typically localized more radially.
The lunula may be difficult to distinguish from an old ulnar styloid process avulsion injury.