Calf enlargement from S-1 radiculopathy. Report of two cases.

Two patients with painless hypertrophy of one calf had clinical and myelographic features compatible with an S-1 radiculopathy. Electromyographic studies revealed intermittent spontaneous discharges (bizarre repetitive potentials) in the affected extremity. Several patients have previously been described with S-1 radiculopathy and calf hypertrophy with or without spontaneous electrical activity. The hypertrophy in the two present cases could have been caused by continuous stretching (both patients were very active), by the abnormal electrical activity, or by a combination of the two. A neurogenic lesion must be excluded in patients with isolated hypertrophy of a calf muscle, even in the absence of radicular pain.