Maxillary sinus hypoplasia (MSH) is an uncommon abnormality of paranasal sinuses noted in clinical practice. Computed tomography (CT) scan helps in diagnosing the anomaly along with any anatomical variation that may be associated with it. MSH is usually associated with other anomalies like uncinate process hypoplasia. Three types of MSH have been described. Type 1 MSH shows mild maxillary sinus hypoplasia, type 2 shows significant sinus hypoplasia with narrowed infundibular passage and hypoplastic or absent uncinate process, and type 3 is cleft like maxillary sinus hypoplasia with absent uncinate process. CT and endoscopic examination usually complement each other in diagnosing MSH.
MSH is an uncommon abnormality that comes across in clinical practice. It has been reported in 1.73% to 10.4% of patients with sinus symptoms [
Summary table.
Etiology | Embryological and acquired causes like trauma or infection causing arrest of sinus pneumatisation |
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Incidence | 1.73% to 10.4% of patients with sinus symptoms |
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Gender ratio | No sex predilection |
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Age predilection | No age predilection |
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Risk factors | None |
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Findings on imaging | X-ray opacification of sinuses, CT-cleft like sinus with absent uncinate process |
25-year-old male presented to otorhinolaryngology out-patient department with chief complaints of nasal discharge and headache on and off since childhood. Neurological examination was carried out and was reported to be normal. Patient was referred to radiodiagnosis department where the patient was taken up for X-ray paranasal sinuses water’s view which showed opacification of bilateral maxillary antrum (Figures
25-year-old male with recurrent headache. Face profile of patient (a). Opacification of bilateral maxillary sinuses (arrow) on plain radiograph (b) with loss of pneumatisation (arrow) on 3D CT reconstruction paranasal sinuses (c). Cleft like bilateral maxillary sinuses (arrow) and absent uncinate process (arrowhead) and enlargement of nasal fossa (curved arrow) on axial section plain CT paranasal sinuses (d).
25-year-old male with recurrent headache. Coronal sections plain CT paranasal sinuses showing cleft like bilateral maxillary sinuses with loss of pneumatisation (arrow).
Causes of maxillary sinus hypoplasia are trauma, infection, surgical procedure, irradiation, and congenital anomaly. Congenital anomaly such as Treacher Collins syndrome is associated with unilateral maxillary sinus hypoplasia.
Classification of MSH has been described in previous studies. Bolger et al. classified MSH into three types. Type 1 MSH shows mild maxillary sinus hypoplasia, type 2 shows significant sinus hypoplasia with narrowed infundibular passage and hypoplastic or absent uncinate process, and type 3 is cleft like maxillary sinus hypoplasia with absent uncinate process [
Sirikci et al. classification included orbital involvement into the above classification [
CT paranasal sinuses should be included in diagnosis protocol because it helps us in reaching the diagnosis earlier and with accuracy as we saw in this case where plain radiograph was inconclusive and patient was misdiagnosed as a case of sinusitis; however after CT the correct diagnosis of maxillary hypoplasia was made. Also, CT helps us in diagnosing any associated anomaly that may be present which turns out to be an important guide in deciding the course of surgery and to avoid any unforeseen surgical complications.
The authors declare that there is no conflict of interests regarding the publication of this paper.
Sachin Khanduri was the project leader and helped in preparing the paper. Sumit Agrawal was the corresponding author, wrote the manuscript, and prepared the images. Saakshi Chhabra and Swati Goyal prepared the tables and helped with the references.