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The purpose of this paper is to describe the mental and intellectual developmental status of children with combined intellectual disabilities, reactive attachment disorder (RAD), and/or disinhibited social engagement disorder (DSED), and to describe the presence of comorbid diagnoses.

The study included 55 children that were referred for psychiatric consultation due to low intellectual functioning (borderline or mild; IQ 50-84). Attachment diagnoses were based on the Clinical Observation of Attachment (COA) procedure. Development was measured with the Dutch version of the Vineland Adaptive Behaviour Scales. Psychopathology was measured with the DISC-IV and AUTI-R. Emotional and behavioural problems were measured with the Dutch version of the Developmental Behaviour Checklist.

Children with and without attachment diagnoses had similar IQs. However, children with disturbed attachment, RAD, and/or DSED had lower levels of adaptive behaviour than those without attachment diagnoses. No comorbidity was associated with autism or ADHD. However, 80 per cent of children with RAD and/or DSED were also diagnosed with ADHD. Parents of children with DSED often reported disruptive anti-social behaviour.

Children with RAD and/or DSED may have unused developmental potential. Disturbed attachment should be considered in some cases of ADHD.

Findings suggested that diagnostic expertise provided added value for distinguishing disordered attachment in young clients with intellectual disability.

Autism spectrum disorder (ASD) is an exclusion criterion for one of the two attachment disorders in the DSM 5. However, previous findings indicate that ASD and attachment disorder are unrelated conditions and may co-occur. The purpose of this paper is to explore the diagnostic assessment of an adolescent male with ASD, intellectual disability (ID), severe challenging behaviour and a suspected attachment disorder.

Case study methodology was chosen because of its suitability in the exploration of complex clinical phenomena where prior knowledge is sparse.

It was possible to identify symptoms of attachment disorder in a case involving ASD, ID, anxiety and severe challenging behaviour. The Disturbances of Attachment Interview was particularly useful in this assessment, as was assessment of ASD symptoms and developmental history. Differentiating the two attachment disorders proved challenging.

There is a need for further research in ASD and attachment disorders not limited by current diagnostic categories.

Co-occurring symptoms of attachment disorder may be identified in individuals with ASD and ID, and exploration of these symptoms in assessments of children and adolescents with ASD/ID and challenging behaviour may be beneficial.

The study adds to previous findings on attachment disorder in ASD, demonstrating that identification of attachment disorder is possible even in the presence of a highly complex clinical picture involving severe challenging behaviour. It may also assist other clinicians in identifying and making more accurate assessment of attachment disorder in ASD and ID.