Muscular atrophy affecting proximally located muscles of the legs, i.e., of the thigh. The phenotype is Human Phenotype Ontology entry HP_0008956 (Proximal lower limb amyotrophy). Also known as: Amyotrophy involving the thigh, Amyotrophy of the thigh musculature, Proximal lower limb muscle atrophy, Thigh muscle atrophy, Wasting of thigh muscle.