Clinical History: 
This 33-year-old man presented to clinic with left shoulder pain of two months duration, radiating to his fingertips. Plain film radiographs and a MR examination revealed a focal lesion in his left humeral metaphysis which was found to represent an enchondroma.

Humeral metaphyseal enchondroma

MR Technique: 
Scans were acquired on a Siemens 3 T Verio MR unit. Sequences obtained included (A) coronal spin echo T1-weighted (TR/TE 600/24 ms, scan time 3:34 min:sec, slice thickness 3 mm) and (B) turbo spin echo T2-weighted (TR/TE 4300/103 ms, scan time 3:23 min:sec, slice thickness 3 mm) images.

Imaging Findings:
The MR examination reveals an approximately 1.4 x 3.0 cm lesion which is hypo- and hyperintense to surrounding bone on T1 and T2-weighted images, respectively. The lesion is well circumscribed. A rim is present, hypointense on all pulse sequences and correlating with the partially calcified matrix demonstrated on the plain film. No associated invasive soft tissue or bone marrow edema is present.