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CT classification of the relationship between the cholesterol granuloma and the infracochlear, perilabyrinthine and sphenoidal air cells: ss, sigmoid sinus; sps, superior petrosal sinus; lb, labyrinthine block; fn, facial nerve; gg, geniculate ganglion; ica (or ICA), internal carotid artery; pr, promontory; jb, jugular bulb; Coch, cochlea; cg, cholesterol granuloma; *, cholesterol granuloma in the CT scan; blue arrows, possible drainage pathways.
