A sphingolipidosis subtype that is characterized by the histological appearance of granulomatous deposits in tissues. It results from the accumulation of CERAMIDES in various tissues due to an inherited deficiency of ACID CERAMIDASE.

A very rare autosomal recessive metabolic disorder affecting lipid metabolism. It is caused by mutations in the ASAH1 gene and is characterized by fatty accumulation in the body tissues. Patients develop lipogranulomas in the skin and internal organs, edema and pain in the joints and a hoarse voice. It may be associated with intellectual disability.

The spectrum of ASAH1-related disorders ranges from Farber disease (FD) to spinal muscular atrophy with progressive myoclonic epilepsy (SMA-PME). Classic FD is characterized by onset in the first weeks of life of painful, progressive deformity of the major joints; palpable subcutaneous nodules of joints and mechanical pressure points; and a hoarse cry resulting from granulomas of the larynx and epiglottis. Life expectancy is usually less than two years. In the other less common types of FD, onset, severity, and primary manifestations vary. SMA-PME is characterized by early-childhood-onset progressive lower motor neuron disease manifest typically between ages three and seven years as proximal lower-extremity weakness, followed by progressive myoclonic and atonic seizures, tremulousness/tremor, and sensorineural hearing loss. Myoclonic epilepsy typically begins in late childhood after the onset of weakness and can include jerking of the upper limbs, action myoclonus, myoclonic status, and eyelid myoclonus. Other findings include generalized tremor, and cognitive decline. The time from disease onset to death from respiratory complications is usually five to 15 years.

Farber disease is an inherited lipid storage disease in which an excess amount of fat builds up in the joints, tissues, and central nervous system. Symptoms of Farber disease include a hoarse voice or weak cry, small lumps of fat under the skin and in other tissues (lipogranulomas), and swollen and painful joints. Other symptoms may...