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A bone tumor in the finger

Case Identification
Case ID Number: 
Clinical case information
Case presentation: 

The 34-year-old man has a 2 year history gradual growth of a slightly tender mass on the index finger. There is no other significant medical history or exam finding.

Radiological findings:: 
There is a mass on the dorso-radial surface of the middle phalanx, with a slight abnormality in the cortex.
Laboratory results:: 
no laboratory analysis was made.
Differential Diagnosis: 
The differential diagnosis will include surface lesions.
Special Features of this Case:: 
Surface lesions are a special group of tumors, and since there are only a few tumors in this group, the list of possibilities is short. A surface lesion on the phalanx of a finger or toe, especially with the xray features this one has, is a "classic" presentation of one tumor in particular. Which one is it? For exam purposes, students should memorize the names of all surface lesions along with their features.
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