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HHID syndrome with plantar fat pads caused by a de novo ARID1B mutation.

Introduction Pöyhönen et al. (2004) described a new dysmorphic syndrome characterised by hypertrichosis, hyperkeratotic plaques, corpus callosum abnormalities, intellectual disability (ID), and dysmorphic features. The main dysmorphic features described in the three reported Finnish patients were low anterior hairline, thick arched eyebrows, a broad nasal tip, a short philtrum, a thick drooping lower lip and simple posteriorly rotated ears. The underlying genetic aetiology of the syndrome, referred to as ‘hypertrichosis, hyperkeratosis, abnormal corpus callosum, and intellectual disability (HHID)’, was undetermined until Zweier et al. (2017) detected pathogenic de novo ARID1B mutations in two of the three previously reported patients through whole exome sequencing.