A 6-week-old, full-term, white girl presented with a rapidly enlarging right-sided neck/parotid gland mass. Her parents had noticed a small, nontender bump at 3 weeks of age that had remained the same size until 4 days before admission, at which time it began to rapidly enlarge. She continued to feed well and had no constitutional symptoms.

A 7-year-old boy presented with a 1-year history of a rash on his forefeet. The rash was not pruritic, but there was an occasional burning sensation in the affected area. The child was active in sports. His past health was unremarkable. There was no family history of skin problems.

A 7-year-old boy with a past history of recurrent urinary tract infections (UTIs) presented to the emergency department with gross hematuria, dysuria, and UTI resistant to treatment with oral antibiotics.