Absent paranasal sinus

The human nose is the most protruding part of the face. It bears the nostrils and is the first organ of the respiratory system. [Source: Wikipedia ]

May Be Caused by

 Common

Congenital sinus aplasia

Fibrous dysplasia

Hypothyroidism

Infantile hypothyroidism

Kartagener syndrome

Leontiasis ossea

Paget disease of bone

Primary anemia

Sickle cell disease

Thalassemia

Trisomy 21

 Uncommon

Binder syndrome

Cleidocranial dysostosis

Cockayne syndrome

Craniodiaphyseal dysplasia

Craniometaphyseal dysplasia

Diaphyseal dysplasia

Frontometaphyseal dysplasia

Frontonasal dysplasia

Hyperphosphatasia

Hypopituitarism

Melnick-Needles osteodysplasty

Metaphyseal chondrodysplasia Jansen type

Osteopathia striata with cranial sclerosis

Osteopetrosis

Otopalatodigital syndrome type 2

Prader-Willi syndrome

Pyknodysostosis

Schwarz-Lélek syndrome

Treacher Collins syndrome