MS-3137

A 65 years old female patient visits her doctor with complaints of stiffness in both hands lasting for several hours. She has also observed that her fingers turn white when exposed to cold but denies any other related symptoms. X-rays of the affected metacarpophalangeal (MCP) and proximal interphalangeal (PIP) joints of the hands reveal periarticular osteopenia and bony erosions.

What is the probable diagnosis?