The distinguishing factor is that in silent sinus syndrome, there is an absence of sinusitis symptoms. To be clear, chronic maxillary sinusitis may be a primary causitive factor in a significant number of silent sinus syndrome cases, it just may be asymptomatic. Silent sinus syndrome also must be distinguished from maxillary sinus hypoplasia, which is congenital. Treatment
Silent sinus syndrome is usually treated with surgery. The first stage involves restoring sinus function, most often by performing an endoscopic uncinectomy (removal of uncinate process) and maxillary antrostomy. The second stage, if needed, involves reconstruction of the orbital floor. While some clinics perform the two stages simultaneously, most authorities recommend waiting a minimum of 6 or as many as 18 months, as spontaneous remodeling of the orbital floor after the sinus repair will occur in many if not most cases. Any prolapsed contents (such as those from the orbit) must be put back in place, though this is an rare occurrence in an already rare syndrome. If the inferior oblique muscle is damaged, it may be partially removed (known as myectomy). Mucus and secretions must be drained from the sinus. Earlier treatment has better outcomes. Epidemiology
Silent sinus syndrome is fairly rare. It can occur at any age, but is slightly more common in middle-aged people. It occurs equally in sinuses on each side of the face. History
Silent sinus syndrome was first described in 1964. References
Bibliography
Illner A, Davidson HC, Harnsberger HR, Hoffman J (2002). "The silent sinus syndrome: clinical and radiographic findings". AJR Am J Roentgenol. 178 (2): 503–6. doi:10.2214/ajr.178.2.1780503.
A galactocele (also called lacteal cyst or milk cyst) is a retention cyst containing milk or a milky substance that is usually located in the mammary glands. They can occur in women during or shortly after lactation. They present as a firm mass, often subareolar, and are caused by the obstruction of a lactiferous duct. Clinically, they appear similar to a cyst on examination. The duct becomes more distended over time by epithelial cells and milk. It may rarely be complicated by a secondary infection and result in abscess formation. These cysts may rupture leading to formation of inflammatory reaction and may mimic malignancy. Once lactation has ended the cyst should resolve on its own without intervention. A galactocele is not normally infected as the milk within is sterile and has no outlet through which to become contaminated. Treatment is by aspiration of the contents or by excision of the cyst. Antibiotics are given to prevent infection.Galactoceles may be associated with oral contraceptive use. They have been known to present, although rarely, after Breast augmentation and Breast reduction. References
External links

Case description and discussion at Harvard.edu