 In addition to differentiating Koro from body dysmorphic disorder, physicians also recommend that differential diagnosis separates Koro from physical urological abnormalities.For example, one physical disorder that causes loss of penile size is Peyronie's disease, where the tunica albuginea develops scar tissue that prevents the full expansion of an erection and causes flaccid penis retraction.Additionally, a buried penis is a normally developed penis, partially covered by the suprapubic fat which can be surgically removed.