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R J Scholl

Publications and source records attributed to R J Scholl.

6 recordsLinked to original sources
PubMed1998

Magnetic resonance imaging of a mediastinal ependymoma.

Ependymomas typically occur in the brain and spinal cord, and represent 5% and 16% of primary intracranial and spinal cord tumors respectively. Ependymomas arising outside the central nervous systems are uncommon and when they do occur are usually seen in the sacrococcygeal region. Other reported sites include the pelvis, spinal nerve roots, and lung. An extraspinal mediastinal ependymoma is a rare occurrence, with only two previously reported cases to our knowledge. In both instances, the lesion arose in the posterior mediastinum, and were imaged with either chest radiographs alone or chest radiographs and computed tomography. In our case, plain radiography was followed by magnetic resonance imaging. This report documents the clinical, pathological, and magnetic resonance imaging findings in a case of a posterior mediastinal ependymoma. Primary mediastinal ependymomas are rare lesions that may be considered in the differential diagnosis of a posterior mediastinal mass.

Ependymoma↗
PubMed1997

Tc-99m pertechnetate thyroid images in hyperthyroidism. Size, distribution, and presence of a pyramidal lobe.

One hundred consecutive thyroid images obtained by use of Tc-99m pertechnetate, in authenticated cases of hyperthyroidism, were reviewed. Calibrated images showed that only 42 of the 200 thyroid lobes (21%) were greater than 5 cm in length. The enlarged lobes occurred in 29 patients. Of these, only 4 had a multinodular appearance (and 7 patients with smaller lobes also had multinodular glands). Neither thyromegaly (by length) nor multinodular appearance are common features of hyperthyroidism in this area. There were 12 instances of pyramidal lobes in the hyperthyroid men (12 of 26 = 46%) and 24 cases in women (24 of 74 = 32%). The site of origin of the pyramidal lobe was from the left in 17, from right in 16, and from the midline in 3 cases. During the period of review of all thyroid images, only one other case of a pyramidal lobe was found (a case of multinodular goiter).

Adolescent↗
PubMedDate not supplied

Cysts and cystic lesions of the mandible: clinical and radiologic-histopathologic review.

Many lesions that occur in the mandible have a cystlike radiographic appearance. These lesions are often difficult to differentiate on the basis of their radiographic features alone. Mandibular lesions may be odontogenic or nonodontogenic. Among odontogenic lesions without mineralization, ameloblastomas, odontogenic keratocysts, and dentigerous cysts can all appear as well-defined, unilocular, well-corticated, lucent lesions that are often associated with the crowns of impacted or unerupted teeth. Most radicular cysts appear as round or pear-shaped, unilocular, lucent lesions in the periapical region. Among odontogenic lesions with mineralization, complex odontomas contain multiple masses of dental tissue and compound odontomas contain multiple teeth or toothlike structures. Odontogenic myxomas are characterized by lytic osseous changes of varying size, which may be demarcated and expansile or exhibit ill-defined borders. Nonodontogenic lesions that mimic odontogenic lesions include benign fibro-osseous lesions (conventional or juvenile ossifying fibroma, focal or periapical cemento-osseous dysplasia, florid osseous dysplasia), traumatic bone cyst, lingual salivary gland inclusion defect, central giant cell granuloma, brown tumor of hyperparathyroidism, arteriovenous malformation, and mucoepidermoid carcinoma. The clinical and radiographic features of these mandibular lesions help establish a differential diagnosis, although microscopic tissue evaluation is generally necessary to accurately identify the lesion.

Adolescent↗