An Intraarticular Osteoid Osteoma: A Case Report & Review of Literature

 Osteoid osteoma (OO) is one of the common benign bone tumors but an uncommon cause of musculoskeletal pain. Its diagnosis is usually not difficult in classic clinical setup and in typical location in diaphyseal region. However, the diagnosis of juxta or intraarticular osteoid osteoma (IAOO) is challenging because of atypical clinical presentation responsible for delay in diagnosis and treatment. We report a rare case of IAOO as a cause of chronic shoulder pain to make clinician aware to help in its early diagnosis and management. A 28-year-old woman presented with chronic debilitating right shoulder pain. The diagnosis was established on CTscan after 2 years of onset of symptoms because of atypical clinical presentation as a chronic monoarthritis of the shoulder. CTscan demonstrated radiolucent nidus with central calcification with areas of surrounding sclerosis. The tumor was excised surgically and histopathologic examination confirmed the diagnosis of osteoid osteoma. So, in the scenario of an unexplained chronic monoarthritis, the possibility of intraarticular osteoid osteoma should also be kept in mind. CT-scan remains the investigation of choice for demonstrating the nidus and surgical exicision relieves the symptoms.  DOI: http://dx.doi.org/10.3126/njr.v3i2.9615   Nepalese Journal of Radiology Vol.3(2)July-Dec, 2013: 77-80</jats:p

Spinal Epidermoid Cyst in a Child- An Experience with a Rare Case

Epidermoid cysts are rare benign neoplasm accounting for less than 1% of all intra-spinal tumors. Congenital epidermis cysts are frequently found with syringomyelia, dermal sinus and spina bifida. Most common etiology for an acquired cyst is repeated lumbar puncture. Congenital epidermoid cysts, often associated with other spinal dysraphisms, are caused by the anomalous implantation of ectodermalcells during closure of the neural tube between the third and fifth week of embryonic life. This is a very rare case. With all these characteristics and literature review, we report this case for its rarity and unique characteristics in this part of world (Nepal). These patients commonly present late to the hospital.</jats:p