Osteochondroma

-Not to be confused with the congenital anomaly called Suprachondylar process.

-Also known as Coat-hanger exostosis

-Is a bony exostosis projecting from the external surface of a bone; usually has a cartilaginous cap.

1. Key clinical features

   1. Occurs ~20 yoa

   2. Points away from the joint, there is no ligament

   3. Most are asymptomatic. M/c complaint is a painless mass around the joint

2. Key radiological features

   1. 2 types of Osteochondroma:

      1. Sessile: On a broad, flat base and no stalk; common in the humerus and scapula.

      2. Pedunculated: On a long stalk, with a cauliflower top. Extending away from the joint.

   2. Coat-hanger exostosis represents the pedunculated.

   3. Has a continuous cortex until you reach the tip. Then it is cartilaginous

3. Most common complication

   1. Aggressive biopsy

   2. Trauma or fractures then can become malignant.

Category: Orthopedics Notes , Tumors Revision