The diagnostic triad of exophthalmos, diabetes insipidus and bone lesions is characteristic of
Hand-Schuller-Christian disease: It is a chronic disseminated form of histiocytosis involving both soft tissues and bones in older children of either sex. It is characterised by a triad of proptosis, diabetes insipidus and bony defects in the skull. Ref:- A K KHURANA; pg num:-397
Fibrous dysplasia
Letterer-Sieve disease
Osteoporosis
Hand-Schuller Christian disease
Tumors