title: Occult hyperparathyroidism presenting as a parathyroid cyst.
mesh_terms: D003560:Cysts / Q000175:diagnosis*; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D006961:Hyperparathyroidism / Q000175:diagnosis* / Q000000981:diagnostic imaging; D008875:Middle Aged; D010279:Parathyroid Diseases / Q000175:diagnosis*; D011859:Radiography