Written expression disorder
Disorder of written expression is a childhood condition which involves poor writing skills.
Although no body-wide (systemic) studies have been conducted to determine how common this disorder is, it is thought to be about as common as learning and reading disorders.
This disorder appears by itself or along with other learning disabilities such as:
Kelly DP. Patterns of development and function in the school-aged child. In: Kliegman RM, Behrman RE, Jenson HB, Stanton BF, eds. Nelson Textbook of Pediatrics. 18th ed. Philadelphia, Pa: Saunders Elsevier; 2007:chap 30.