There appears to be little awareness among pediatricians of masseter or temporalis muscle hypertrophy which may mimic other conditions, particularly parotitis. Three recent cases presented briefly serve to illustrate this condition.
Patient 1.—A 2-year, 4-month-old girl was seen on numerous occasions by several physicians in an emergency room because of bilateral swelling over the region of the masseter and temporal muscles (Fig 1) thought to be bilateral parotitis. It was finally recognized that the physical findings could be related to the fact that she chewed bubble gum every day, all day long.Patient 2.—A 15½-year-old boy was admitted to the Boston Floating Hospital for Infants and Children with a diagnosis of bilateral parotid swelling of seven months' duration which had become progressively more painful. The patient had been evaluated at another hospital at which numerous laboratory tests including bone marrow examination and liver biopsy had been performed. On