Novel manifestations of Farber disease mimicking neuronopathic Gaucher disease

Diagnosis of rare disorders requires heightened clinical acumen. When such disorders present with atypical or novel features, it adds to the diagnostic challenge. A 9-month-old female infant who had received a diagnosis of neonatal hepatitis due to cytomegalovirus infection at 2 months of age presented to our institute with developmental delay, fever, vomiting, feeding difficulty, breathlessness and features of elevated intracranial pressure due to hydrocephalus. Key examination findings with cholestatic jaundice as an early manifestation led to suspicion of type 4 Farber disease. Observation of hydrocephalus, hypertension, bilateral pinguecula and Erlenmeyer flask deformity of the femur were unusual findings for Farber disease. The child had few features (pinguecula, Erlenmeyer flask deformity and hydrocephalus) overlapping with Gaucher disease. Alternatively, prosaposin deficiency (Farber disease type 7) was another differential diagnosis. Diagnosis of Farber disease was confirmed by detection of foamy macrophages on skin biopsy and two homozygous missense variants in ASAH1 gene.

Farber disease: A Fatal Childhood Disorder with Nervous System Involvement

Farber Disease is an autosomal recessive inherited lysosomal storage disorder which is characterized by tissue accumulation of ceramide. It is caused by mutations within ASAH1 encoding for acid ceramidase. It represents a rare condition. Only twenty seven cases have been reported. Seven subtypes of Farber disease have been identified. The clinical presentation is characterized by the appearance of subcutaneous skin nodules, bone and joint deformities, and progressive hoarseness. Neurological symptoms as psychomotor delay or regression, hypotonia, seizures, and peripheral neuropathy were reported in some subtypes of Farber disease. The nervous system involvement is correlated to poor prognosis. In this study, we report on clinical, biochemical and molecular findings of two Tunisian siblings with Farber disease.

A Girl with Farber Disease Treated with Bone Marrow Transplantation

Background: Farber disease is a very rare autosomal recessive disease of lipid metabolism caused by deficient activity of lysosomal acid ceramidase. Symptoms can begin in the first year of life by a triad of painful and swollen joints and subcutaneous nodules, progressive hoarseness and variable central nervous system involvement. Case Report: A 5 months old girl with subcutaneous nodules in limbs, pain and swelling in her fingers, Knees, elbow and hoarseness was referred to our clinic. She had neurodevelopment delay in walking and talking. Genetic analysis was reported homozygosity for a c.830C>A mutation in exon 11 of N-Acylsphingosine Amidohydrolase 1 (ASAH1) gene. She diagnosed with Farber disease and treated with bone marrow transplantation. After that her signs and symptoms were improved and she could to walk. Conclusion: Farber disease is associated with characteristics including swollen joints, subcutaneous nodules, progressive hoarseness and variable CNS involvement. Moreover, bone marrow transplantation improved these symptoms.