A 14 year old boy has difficulty in expressing himself in writing and makes frequent spelling mistakes. He passes his examination with poor marks. However his mathematical ability & social adjustment are appropriate for his age. Which of the following is the most likely diagnosis?
**Core Concept**
The question describes a case of a 14-year-old boy with difficulty in writing and spelling, but with otherwise normal cognitive and social abilities. This scenario is suggestive of a specific learning disorder that affects an individual's ability to acquire and use written language skills.
**Why the Correct Answer is Right**
The boy's difficulties in writing and spelling, despite average mathematical ability and social adjustment, are characteristic of **Dysgraphia**, a type of Specific Learning Disorder (SLD). Dysgraphia is a neurodevelopmental disorder that affects an individual's ability to write, spell, and compose written language. It is often associated with difficulties in fine motor skills, hand-eye coordination, and processing written language. The underlying mechanism of dysgraphia involves impaired functioning of the left posterior parietal cortex and left inferior frontal gyrus, which are responsible for language processing and motor planning.
**Why Each Wrong Option is Incorrect**
**Option A:** Dyslexia is a type of Specific Learning Disorder that affects an individual's ability to read and spell, but it is not the correct diagnosis for this case since the boy's difficulty is specifically with writing and not reading.
**Option B:** Dyscalculia is a type of Specific Learning Disorder that affects an individual's ability to understand and work with numbers, which is not relevant to this case since the boy's mathematical ability is appropriate for his age.
**Option C:** Social adjustment issues are not a characteristic of dysgraphia, making this option incorrect.
**Clinical Pearl / High-Yield Fact**
Dysgraphia can be differentiated from dyslexia by assessing the individual's writing and drawing skills, as individuals with dysgraphia often exhibit difficulties with handwriting, drawing, and composition, while those with dyslexia may struggle more with reading and spelling.
**Correct Answer:** **D**. Dysgraphia.