Published: 2020-08-25

A rare presentation of left postaural mastoid osteoma

E. Sivakumar, C. A. Swapna, Lavanya Karanam


Osteomas are benign slow growing tumors of mesenchymal origin. Most commonly found along the long bones like proximal shaft of femur around 19% followed by tibia around 10% and head and neck osteomas around 0.1 to 1%. We report a rare case of postaural osteoma in a 44 year old female with cosmetic deformity and discuss its differential diagnoses and treatment protocol. A 44-year-old female presented to ear, nose and throat (ENT) outpatient department (OPD) with complaints of swelling in the left postaural region since 25 years gradually increasing in size. On examination, there was a single swelling in the left post aural region measuring about 4×5×3 (cms) hard in consistency and non-tender. Non contrast computerized tomography (CT) of temporal bone showed well defined extracranial dense sclerotic bony lesion arising from mastoid part of left temporal bone likely osteoma. Patient planned for excision and histopathological examination was consistent with osteoma. In conclusion, though osteoma in mastoid bone is a very rare possibility still it should be kept in consideration in the list of differential diagnoses of the tumors of temporal bone. We highlight the need for a careful clinical evaluation supported by radiologic and histopathological investigations which will help in the diagnosis, resulting in better prognosis.


Postaural osteoma, Mastoid bone, Non contrast computerised tomography

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de Chalain T, Tan B. Ivory osteoma of the craniofacial skeleton. J Craniofac Surg. 2003;14(5):729-735.

Smud D, Augustin G, Kekez T, Kinda E, Majerovic M, et al. Gardner’s syndrome: genetic testing and colonoscopy are indicated in adolescents and young adults with cranial osteomas: a case report. World J Gastroenterol.2007;13:3900-3903.

Güngör A, Cincik H, Poyrazoglu E, Saglam O, Candan H. Mastoid osteomas: report of two cases. Otol Neurotol. 2004;25:95-7.

Carlos UP, Ricardo WF, de Carvalho, Annie MG, de Almeida, Rafaela ND. Mastoid Osteoma. Consideration on two cases and literature review. Intl Arch Otorhinolaryngol. 2009;13:350-3.

Lt Col AK Das, GP Capt RC Kashyap. Osteoma of the mastoid bone-a case report. MJAFI 2005;61:86-7.

El Fakiri M, El Bakkouri W, Halimi C, Mansour A, Ayache D. Mastoid osteoma: Report of two cases. Europian Annals of Otorhinolaryngology, Head Neck Dis. 2011;128:266-68.

Denia A, Perez F, Canalis RR, Graham MD. Extracanalicular osteomas of the temporal bone. Arch Otolaryngol. 1979;105:706‑9.

Kim CW, Oh SJ, Kang JM, Ahn HY. Multiple osteomas in the middle ear. Eur Arch Otorhinolaryngol. 2006;263:1151‑4.

Quesnel AM, Lee DJ. Extensive osteomas of the temporal‑parietal‑occipital skull. Otol Neurotol. 2011;32:e3‑4.

Parelkar K, Thorawade V, Jagade M, Kar R, Pandare M, Nataraj R et al. Osteoma of temporal bone- A rare case report. International Journal of Otolaryngology and Head and Neck Surgery. 2014;3:252-58.

Harley EH, Berkowitz RG. Imaging case study of the month, osteoma of the middle ear. Ann Otol Rhinol Laryngol. 1997;106:714-8.

Parashari UC, Khanduri S, Singh N, Bhadury S. Mastoid osteoma. Indian J Otol. 2014;20:132-33.

Estrem SA, Vessely MB, Oro JJ. Osteoma of the internal auditory canal. Otolaryngol Head Neck Surg. 1993;108:293-7.

Ben-Yaakov A, Wohlgelernter J, Gross M. Osteoma of the lateral semicircular canal. Acta Otolaryngol. 2006;126:1005-7.

Probst LE, Shankar L, Fox R. Osteoma the mastoid bone. J Otolaryngol. 1991;20(3):228-30.