No abstract

Benign fibrous histiocytomas of the skin sometimes extend into the deeper dermis with higher cellularity and show more aggressive clinical courses in comparison with typical dermatofibromas. They may occur either as a true neoplasm or in a reactive process. We describe a case of fibrous histiocytoma which was triggered by tuberculin skin test.

Congenital myopathies: characterized by developmental delays in motor skills; skeletal and facial abnormalities are occationally evident at birth Muscular dystrophies: caused by progressive weakness in voluntary muscles; sometimes evident at birth Mitochondrial myopathies: caused by genetic abnormalities in mitochondria, cellular structures that control energy; include Kearns-Sayre syndrome, Glycogen storage diseases of muscle: caused by mutations in genes controlling enzymes that metabolize glycogen and glucose (blood sugar); include Pompe's, Anderson's and Cori's disease Myoglobulinurias: caused by disorders in the metabolisum of a fuel (myoglobulin) necessary for muscle work; include McArdle, Tarui and DiMauro diseases Dermatomyositis: an inflammatory myopathy and skin lesions Myositis ossificans: characterized by bone growing in muscle tissue Familiar periodic paralysis: characterized by episodes of weakness in arms and legs Polymyositis inclusion body myositis and related myopathies: inflammatory myopathies of skeletal muscles Neuromyotonia: characterized by alternating episodes of twiching and stiffness Stiff-man syndrome: characterized by episodes of rigidity and reflex spasms Common muscular cramps and stiffness and tetany: characterized by prologed spasms of the arms and legs