Sinusitis is LEAST involved in: (A) Maxillary, (B) Ethmoid, (C) Frontal, (D) Sphenoid
Answer is D. (Sphenoid) (181- Dhingra 4th)* Most common sinus involved is - Maxillary* Least common sinus involved in - Sphenoid* Order of sequence - Maxillary >ethmoid > frontal > sphenoid