Is an association of acro-osteolysis, bone fragility, and enchondromatosis a newfound disease caused by an amplification of PTHLH? A case report

Is an association of acro-osteolysis, bone fragility, and enchondromatosis a newfound disease caused by an amplification of PTHLH? A case report

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Abstract Background Acro-osteolysis (AO) refers to resorption of the distal finger and toe phalanges.It displays two patterns: (i) diffuse AO and (ii) transverse or bandlike AO.AO can be a sign of local distress (e.

g.of toxic origin), but is very often a sign of a constitutional or systemic acquired disorder.Case presentation A 15-year-old girl was referred to a paediatric rheumatologist for recurrent pain in her fingertips.

She presented a particular cross-sectional AO associated with the presence of intraosseous Full Storage Bed w/Bookcase HDBD cysts and bone fragility with atypical fractures.Initial laboratory tests and radiological examination did not allow an etiological diagnosis.Genetic studies revealed a 12p11.

22-p11.23 microduplication of 900 kb including the PTHLH (parathyroid hormone-like hormone) gene, which encodes for a hormone involved in the regulation of endochondral ossification and differentiation of chondrocytes, via its PTHLH receptor.Conclusions To date, 12p11.

22-p11.23 duplications have been reported in five families with skeletal abnormalities, and in particular AO and enchondromatosis associated with Pillow bone fragility.This new observation, added to the other reported cases, suggests a close relationship between the presence of this microduplication and the skeletal abnormalities found in the patient.

We suggest the descriptive name ABES (acro-osteolysis, bone fragility and enchondromatosis syndrome) to designate this disorder.