The time course and pattern of the initiation of satellite cell mitoses was studied following a crush injury of the distal third of the 30-day-old rat extensor digitorum longus, a muscle in which myofibers run the entire length of the belly. Satellite cell mitotic activity was monitored using autoradiography after injection of 3H-thymidine. Satellite cell labeling rose above control values by 15 hours post injury at the injured site and by 20 hours in the middle third or adjacent undamaged portion of the muscle. Labeling decreased in the proximal third of the muscle, so that by 25 hours post injury, a gradient of labeling was established along the muscle length. Electron microscopy (EM) quantitation showed that the reduced labeling in the proximal third resulted from a reduction in satellite cell numbers. The results suggest that mitotic activity of satellite cells after localized injury occurs mainly at or near the site of injury, but that many of the dividing cells have migrated from undamaged areas distant from the lesion site.

Animals↗

PubMedDate not supplied

Lymph node examination by fine needle aspiration in patients with known or suspected malignancy.

In a series of more than 2,500 fine needle aspirates from multiple body sites, over 200 were clinically identified as lymph nodes from patients with known or suspected malignancy. The material was obtained using the easily manipulated Aspir-Gun with a 21-gauge or 22-gauge needle and syringe. Of the 200 lymph node specimens, 100 (50%) were cytologically reported as positive for malignancy. Ninety cases had surgical pathology specimens available for comparison with the fine needle aspiration (FNA) specimens. For the 88 of these cases with satisfactory FNA specimens, evaluation of the FNA results showed a predictive value of a positive result of 96.8%. These results compare favorably with those of surgical biopsy. The malignancies present in the lymph nodes included numerous adenocarcinomas from the breast, melanoma and pulmonary small-cell carcinoma. Six cases are briefly presented in which the FNA diagnosis was more problematic. While histologic examination of tissues or organs remains the desirable benchmark of comparison, the appropriate utilization of FNA cytology to guide therapy, particularly in a patient with previously diagnosed malignancy, may obviate the need for an open biopsy. The technique is convenient for patient and physician, useful for outpatients, relatively painless and provides good correlation between cytologic morphology and histopathology.

Adenocarcinoma↗

PubMedDate not supplied

[What to tell a woman who has just undergone surgery for extrauterine pregnancy].

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Adult↗