Giant cholesterol granuloma of petrous apex.

ABSTRACT

Cholesterol granulomas are chronic inflammatory lesions located primarily in the apex of the petrous part of the temporal bone. They are benign, tumor-like lesions, consisting of a cystic cavity filled with a chocolate-brown fluid and present as hyperintense masses on T1 and T2 sequences on MRI. The most common causes of cholesterol granulomas are chronic middle ear infections and traumas, explaining their prevalence in young to middle aged patients. Due to their progressively expanding nature, clinical presentation include vertigo, diplopia, tinnitus, hearing loss and seizures. Treatment of cholesterol granulomas consists of two different approaches watch and wait or radical surgery to remove the granulomatous tissue. We present the case of a 38-year-old male patient who was admitted to the Neurology Clinic with complaints of loss of consciousness, headache, pain on the left side of the face and tinnitus in the left ear. These symptoms had been present for some time and gradually worsened in intensity and frequency. Initially after an EEG was performed, the patient showed signs of focal epilepsy and began treatment accordingly. Subsequently, a CT and an MRI of the head and neck were performed, which showed a large, well demarcated expansile mass within the left petrous apex, which was hyperintense on T1 and T2. Based on his clinical presentation and radiologic findings, a diagnosis of cholesterol granuloma was established. Through this case report we hope to emphasize the role imaging modalities play in the diagnosis and appropriate management of cholesterol granulomas.