Clinical Vignette
Patient: "Ben," 5-year-old pre-kindergartner, referred by his pediatrician after a speech-language screening revealed language abilities significantly below age expectations.
Chief Concern: Mother: "Ben barely talks and when he does, it's in short 2-word phrases. Other 5-year-olds are telling stories and having conversations. He understands some of what we say but often looks confused when we give him directions. He's going to kindergarten next year and I'm worried he won't be able to keep up."
History of Present Illness: Ben demonstrates persistent difficulties in both expressive and receptive language. Expressive: speaks in 2-3 word utterances ('want juice,' 'go park now') while age expectation is complex sentences. Vocabulary limited (approximately half the expected range for his age). Cannot tell a coherent narrative (cannot describe what happened at preschool beyond isolated words). Grammar is significantly simplified (omits function words, verb tenses incorrect). Receptive: follows 1-step commands reliably but struggles with 2-step commands ('Get your shoes AND put them by the door' — he gets the shoes but does not place them). Misunderstands longer verbal instructions. Does not understand 'why' or 'how' questions. Language milestones were delayed: first words at 20 months, 2-word combinations at 36 months (typical: 18-24 months). Nonverbal cognition estimated within normal limits: completes age-appropriate puzzles, understands cause-and-effect with objects, problem-solves physical tasks. He uses gestures effectively to supplement his limited verbal communication. Social: appropriate eye contact, social reciprocity, shared attention, emotional expression. No restricted interests. No repetitive behaviors. No sensory sensitivities.
Medical History: Hearing: normal (audiology tested). Otitis media history (resolved with tubes at age 2). No neurological conditions.
Mental Status Exam: Engaged, made eye contact, smiled. Initiated contact with gestures (pointing, pulling clinician toward toys). Verbal output: 2-3 word utterances. Said 'big truck' and 'go fast' during play. When asked 'What did you do at school today?': long pause, responded 'Play. Outside.' (2 single words rather than narrative). Followed instruction 'Give me the red block': correct. Followed instruction 'Put the blue block ON TOP of the yellow block AND then give me the green one': completed first step only. Nonverbal problem-solving: completed a 12-piece puzzle. Affect happy, cooperative.
Step 1: Language Disorder DSM-5-TR Criteria
Criterion A: Persistent difficulties in the acquisition and use of language across modalities due to deficits in comprehension or production that include: (1) reduced vocabulary, (2) limited sentence structure, (3) impairments in discourse.
(1) Vocabulary approximately half expected for age. (2) Speaks in 2-3 word phrases (expectation: complex sentences). Grammar significantly simplified. (3) Cannot produce coherent narrative. Single-word responses to open questions. MET — all 3 present.
Criterion B: Language abilities substantially and quantifiably below expected for age, resulting in functional limitations.
Language 2+ years below expectation. Functional limitations: cannot follow complex instructions, cannot tell a story, will struggle significantly in kindergarten academic demands. MET.
Criterion C: Onset in early developmental period.
First words at 20 months (delayed). 2-word combinations at 36 months (delayed). Early developmental onset confirmed. MET.
Criterion D: Not attributable to hearing or sensory impairment, motor dysfunction, or another medical/neurological condition, and not better explained by ID or global developmental delay.
Hearing normal. No motor issues. No neurological condition. Nonverbal cognition normal (puzzles, problem-solving). Language deficit is SPECIFIC — not part of global cognitive impairment. MET.
Step 2: Language Disorder vs. SCD vs. ID
| Feature | Language Disorder | SCD | Intellectual Disability | This Patient |
|---|---|---|---|---|
| Structural language | IMPAIRED (grammar, vocabulary) | Intact | Proportional to IQ | LD: impaired grammar + vocabulary |
| Pragmatics | May be secondary to structural deficit | PRIMARY deficit | Proportional to IQ | Pragmatic limitation secondary to structural |
| Nonverbal cognition | Normal | Normal | Below normal | Normal (puzzles, problem-solving) |
| Social communication intent | Present (uses gestures to compensate) | Impaired | Variable | Present — gestures, social engagement intact |
Modality Assessment
Ben's language disorder affects BOTH production (expressive) and comprehension (receptive). Some children with Language Disorder have primarily expressive deficits while comprehension is relatively intact. Ben's involvement of both modalities is prognostically important and guides the intensity of intervention.
Diagnostic Formulation
Diagnostic Conclusion
Language Disorder (F80.2): All 4 DSM-5-TR criteria met. Mixed expressive-receptive pattern. Normal nonverbal cognition (specific to language). Treatment: (1) Intensive speech-language therapy (individual + group) targeting vocabulary expansion, sentence structure, narrative skills, and comprehension of multi-step instructions. (2) Augmentative/alternative communication (AAC) strategies for academic support during treatment. (3) Pre-kindergarten language preparation: build academic vocabulary (numbers, letters, classroom instructions). (4) Parent coaching: language enrichment strategies at home (expansion, recasting, simplified input, repeated exposure).
Teaching Points
- Language Disorder in DSM-5-TR encompasses what was previously separated into Expressive Language Disorder and Mixed Receptive-Expressive Language Disorder. DSM-5-TR uses a single diagnosis with specification of which modalities are affected. Ben has both expressive and receptive deficits.
- The distinction between Language Disorder and Intellectual Disability is NONVERBAL COGNITION. In Language Disorder, nonverbal cognitive abilities are NORMAL (the language deficit is specific). In ID, cognitive deficits are GLOBAL (affecting language AND nonverbal abilities proportionally). Ben's normal puzzle-solving and physical problem-solving confirm the specificity.
- Language Disorder must be distinguished from Social (Pragmatic) Communication Disorder. In Language Disorder, the STRUCTURAL components of language (grammar, vocabulary, morphology) are impaired. In SCD, structural language is intact but the SOCIAL USE of language is impaired. Ben's grammatical and vocabulary deficits identify Language Disorder.
- Early intervention for Language Disorder is critically important. Language abilities at school entry are among the strongest predictors of academic achievement. Ben's current language level would place him at significant risk for academic difficulty in kindergarten without immediate intensive intervention.
- Gesture use in Language Disorder is a positive prognostic indicator. Ben's effective use of gestures to compensate for verbal limitations demonstrates intact communicative intent and social cognition. Children who gesture effectively tend to respond better to language intervention than those who do not.