A Calcitonin-Negative Neuroendocrine Tumor Derived from Follicular Lesions of the Thyroid

Neuroendocrine lesions of the thyroid are rare. The most common types are medullary thyroid carcinomas (MTCs) and C-cell hyperplasia. MTCs originate from thyroid parafollicular cells that secrete calcitonin which serves as a serum marker of MTCs. Here, the rare case of a calcitonin-negative neuroendocrine tumor (NET) derived from follicular lesions of the thyroid is described. A 34-year-old man presented at our hospital for the surgical management of an incidental thyroid nodule that was observed on an ultrasound sonography (USG) of the neck. Initially, USG-guided aspiration cytology was performed, and a MTC was suspected. The expressions of thyroglobulin and thyroid transcription factor-1, which are thyroid follicular cell markers, and synaptophysin and chromogranin A, which are neuroendocrine markers, was confirmed following surgical pathology. However, the staining of calcitonin, a marker of MTCs, was not observed. A nonmedullary NET of the thyroid is uncommon, and the distinction between calcitonin-negative NETs and MTCs of the thyroid may be important due to differences in their clinical courses and management.

A Case of Osteomyelitis of the Clavicle as a Complication of Subclavian Vein Catheterization in Hemodialysis Patient / 대한신장학회지

Osteomyelitis (OM) of the clavicle is a rare complication of the central venous catheterization and has been reported infrequently in the literature. We report here a case of OM of the left clavicle complicating right subclavian vein catheterization performed for hemodialysis (HD). A 41-year-old male patient on HD for 3 months complained of pain and mass over the left sternoclavicular joint. Computerized tomography showed a demarcated soft tissue mass. Bone scan demonstrated increased tracer uptake in the left clavicle compatible with OM. The patient underwent surgical exploration with removal of the necrotic bone and he was treated with antibiotics including vancomycin. Afterward he remained well on HD. In conclusion, OM should be considered in any dialysis patient who develops pain and signs of inflammation in the sternoclavicular area after central venous catheterization for HD.

A Case of Dermatomyositis with Secondary Organizing Pneumonia / 영남의대학술지

Dermatomyositis is characterized by progressive, symmetric, proximal muscle weakness and a nonsuppurative inflammatory myopathy of unknown etiology involving predominantly skeletal muscles. It is also characterized by typical skin lesions. Interstitial lung disease has a poor prognosis when it is associated with dermatomyositis. Organizing pneumonia is a disease in which granulation tissue fills the lumina of terminal and respiratory bronchioles and extends into the distal airspaces. The cryptogenic nature of the process is appreciated in that organizing pneumonia patterns of injury can be seen in secondary forms of the disease (secondary organizing pneumonia). Organizing pneumonia has been reported to occur in 5~10% in dermatomyositis-polymyositis patients. Anti-histidyl tRNA synthetase antibody (anti-Jo-1) is a predictive disease marker that is reported to occur in up to 70% of patients. We describe a 49-year-old male dermatomyositis patient who presented with organizing pneumonia and was found to have negative anti-Jo-1 antibody.