A clinical case of diagnosis and treatment of an 8-year-old patient with bilateral acute suppurative otitis media (ASOM) complicated by left mastoiditis and petrositis is presented. By itself, such a rare complication of ASOM as petrositis manifested itself not in the form of the classic Gradenigo triad, but as a parapharyngeal abscess (PPA), due to the destruction of the lower wall of the temporal bone pyramid. Complications arose as a result of contact and hematogenous pathways for the spread of the infection, which debuted in the middle ear cavities 1 month before the patient was admitted to the hospital. The combination of factors such as an aggressive pathogen, the anatomical structure of the middle ear, a decrease in the immune reactivity of the child’s body, the spread of infection through the lower cells of the temporal bone pyramid and the lack of timely antibiotic therapy, led to destructive changes in the bony walls of the temporal bone and the spread of a purulent process to the temporal pyramid bones, and then to the parapharyngeal space. The destruction by inflammation of the lower wall of the pyramid of the temporal bone led to the development of PPA, and not meningoencephalitis, which could have fatal consequences.