What condition presents with rigidity and stiffness progressing to choreiform movements, as well as mood changes?

Huntington's disease is characterized by a combination of motor, cognitive, and psychiatric symptoms. The key features include a progressive movement disorder that begins with rigidity and stiffness, which can then evolve into choreiform movements—irregular, non-repetitive, and abnormally variable movements that are often seen in the later stages of the disease.

Additionally, mood changes are common in individuals with Huntington's disease, as the condition not only affects motor function but also has significant psychiatric manifestations, including depression, irritability, and personality changes. These mood disturbances can often precede the motor symptoms and can significantly impact the patient's quality of life.

In summary, the combination of rigidity and stiffness, transitioning to choreiform movements, alongside mood alterations, distinctly points to Huntington's disease as the correct diagnosis. This progression is a hallmark of the neurodegenerative process occurring in this particular condition.