Employers Covered Under the HCSO. An Employer is covered under the HCSO if it: 1  Is a for-profit business with 20 or more employees, or a non-profit business with 50 or more employees; and. 2  Has employees who work in San Francisco.
(November 2009). Thoracic outlet syndrome (TOS) is a syndrome involving compression at the thoracic inlet, which is known clinically as the superior thoracic outlet resulting from excess pressure placed on a neurovascular bundle passing between the anterior scalene and middle scalene muscles.horacic outlet syndrome (TOS) is a syndrome involving compression at the thoracic inlet, which is known clinically as the superior thoracic outlet resulting from excess pressure placed on a neurovascular bundle passing between the anterior scalene and middle scalene muscles.
Updated April 26, 2016. Thoracic outlet syndrome (TOS) is a condition that causes upper extremity symptoms of pain, numbness, and tingling (not always together, and not the same symptoms in every person). TOS can be difficult to diagnose, is relatively uncommon, and therefore may take a long time to discover it is the cause of your symptoms.