Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Antecubital pterygium ?
    ### Response:
    Antecubital pterygium is characterized by and antecubital webbing, posterior subluxation (dislocation) of radial head, maldevelopment of radioulnar joint, and limited elbow extension with unimpeded elbow flexion. Most reported cases come from the island of Mauritius or nearby islands.
    