[A case of "juvenile" self-healing cutaneous mucinosis in an adult]

Introduction: Self-healing juvenile cutaneous mucinosis (SHJCM) is a stereotypical disease in children characterized by the acute onset of subcutaneous papules and nodules on the face, dorsum of the hands and peri-articular regions that disappear spontaneously within a few months or years. A few cases have been reported in adults, but these display more heterogeneous clinical and histopathological features. Herein we report a case with a juvenile clinical presentation in an adult woman.

Observation: A 36-year-old patient with a history of Von Willebrand disease was referred to our dermatology department following the rapid development of subcutaneous nodules on her face, hands and large joints, together with periorbital edema. Three nodules were surgically removed and histology demonstrated mucin deposition in the dermis with dissociation of collagen fibers. Autoimmune disease, neoplasia, infection and dysthyroidism were ruled out. Bilateral carpal tunnel syndrome was confirmed by electromyogram in this patient carrying out manual work. Treatment with hydroxychloroquine proved unfruitful. After 1.5 years of follow-up, her lesions showed partial regression.

Conclusion: The form of SHJCM described in pediatric populations may occur in rare cases in adults. Should the name of juvenile mucinosis still be used in this event?

Keywords: Canal carpien; Carpal tunnel; Mucinose auto-involutive; Self-healing mucinosis.