The normal paranasal sinus is a gas-filled cavity in the craniofacial bone around the nasal cavity. There are four pairs of maxillary sinus, frontal sinus, ethmoid sinus and sphenoid sinus. Their inner walls are lined with mucous membranes, each with a certain part, shape and exit. . In the case of structures or organs lacking natural contrast, substances above or below the structure or organ may be introduced into the organ or in the common mesh space, such that contrast is developed for imaging, and the introduced substance is called contrast agent or Contrast agent.

Basic Information

Specialist Category: Otolaryngology Examination Category: X-ray

Applicable gender: whether men and women apply fasting: not fasting

Tips: Before the angiographic examination, the patient has to make the necessary preparations. Most of the contrast agents contain iodine, and those with iodine allergies should also pay attention. Normal value

The maxillary sinus is located on both sides of the nasal cavity and is an inverted triangular translucent area. The left and right sides are roughly, the bone wall is clear, and the mucosa may not be developed or a soft tissue shadow along the sinus wall thickness of not more than 1 mm.

The frontal sinus is located in the upper and lower sides of the two eyelids, one on each side, not necessarily symmetrical, the difference in the degree of gasification of the normal frontal sinus is large, and the frontal sinus with good gasification is slightly petal-like.

The ethmoid sinus is located in the small honeycomb shadow between the nasal cavity and the eyelids. The posterior ethmoid sinus group is located in the lower part of the eyelid in this position and overlaps the side wall of the nasal cavity, which is difficult to observe.

Clinical significance

Abnormal result

Inflammatory polyps are often multiple, but also single, semi-circular or lobulated soft tissue shadows, connected to the sinus wall. Single-shot, smooth-edged soft tissue shadows, located in the inferior wall of the maxillary sinus, mostly submucosal cysts. Irregular soft tissue masses on the edges are mostly caused by tumors.

Patients with sinusitis who need to be examined.

Precautions

Inappropriate crowd: None.

Contraindications before examination: Most contrast agents contain iodine, and those with iodine allergies should pay attention. Before the angiographic examination, the patient has to make the necessary preparations.

Requirements for inspection: Actively cooperate with the doctor's work.

Inspection process

Because the paranasal sinus is on the face and the left and right sides of the nasal cavity overlap each other, different photographic positions are required. Currently, Water is used, also known as the nasal sputum. When the patient is photographed, the patient takes a sitting position or a prone position. The ankle is placed on the midline of the table top, and the head is slightly raised, so that the tip of the nose is about 2 cm away from the piece, and the hearing line is at an angle of 37° to the table. The center of the X-ray is perpendicular to the film.

Not suitable for the crowd

Most of the contrast agents contain iodine, and those with iodine allergies should pay attention.

Adverse reactions and risks

Generally no adverse reactions.