Problem: Kionna experiences a great deal of anxiety over her physical appearance. She believes that her head is too big and her nose is asymmetrical. This troubling preoccupation with her physical features interferes with Kionna's occupational and social functioning. She spends hours in front of the mirror and isolates herself from her friends. In the context of obsessive-compulsive disorder (OCD) related disorders, Kionna can be most likely diagnosed with