Frontoethmoidal Osteoma Complicated by Intracranial Mucocele and Hypertensive Pneumocephalus

Association of Paranasal Sinus Osteoma and Intracranial Mucocele-Two Case Reports-

“…All reported lesions have been located at or around the frontoethmoidal junction (Table 1). [1][2][3][4][5][6][7][8][11][12][13][14]16) Absence of signs of sinus obstruction in a previous case suggested a small ectopic sinus not visualized by radiological methods or by direct observation during the surgery, or an intracranial connection of the paranasal sinus that disappeared early in the patient's life was the origin of the mucocele. 13) We were not able to find any kind of obstruction in the involved frontal sinuses in either of our cases.…”

Frontal Sinus Mucocele With Intracranial Extension Associated With Osteoma in the Anterior Cranial Fossa -Case Report-

“…Progressive occupation of the sinus leads to a secondary intracranial mucocele and the development of a one-way valve mechanism, entrapping air intracranially. 3) According to the history of the present case, the osteoma preexisted the gradual growth of the mucocele. Other pathogenetic mechanisms of intracranial mucocele include small ectopic sinus not visualized by radiological methods or direct obstruction during surgery.…”

“…Headache was the most common symptom in previous cases of intracranial mucocele secondary to osteoma. 1,3,5,7,10,13,14,17,19,20) Visual signs such as diplopia, blepharoptosis, and reduction of visual acuity were occasionally present. 1,13,20) In the present case, the giant mucocele in the left frontal lobe was associated with paranasal osteoma in a patient suffering from persistent generalized convulsion.…”

“…[1][2][3][5][6][7][10][11][12][13][14][15][16][19][20][21][22] In most cases of coexisting osteoma and paranasal sinus mucocele, the osteoma was considered to be the primary lesion and the mucocele the secondary lesion because osteoma can cause obstruction of sinus drainage leading to mucocele. Growth of mucocele in the paranasal sinus may be prevented by giant osteoma, resulting in intracranial extension of mucocele.…”

“…Only 21 cases have been reported previously. 1,3,[5][6][7][10][11][12][13][14][15][16][19][20][21][22] Paranasal sinus osteoma can protrude into the anterior cranial fossa and cause intracranial mucocele, as well as cerebrospinal fluid (CSF) leakage and pneumocephalus. 6,7,19,20) We describe a rare case of a giant intracranial mucocele associated with a paranasal sinus osteoma in a patient who presented with a generalized convulsion, discuss a hypothesis for the pathogenesis of the association, and the appropriate surgical strategy for co-existing lesions.…”