Partly calcified intra-articular bodies demonstrate foci of absent signal on all pulse sequences. Like CT arthrography, MR with gadolinium may be used to detect intra-articular bodies that have not yet calcified. Pathology
Cartilaginous bodies or osteocartilaginous bodies with central ossification may be noted. They are typically spherical in shape. Sizes range from several millimeters to several centimeters in diameter. The synovium of the involved joint demonstrates villous hyperplasia, which imparts a wrinkled appearance on gross examination. There may be cartilaginous bodies attached to the synovium. Synovial involvement may be focal or diffuse in nature. Differential diagnosis
Trauma-related:
Fracture with avulsed fragment
Fragmentation of meniscus with calcification
Degenerative joint disease related:
Degenerative joint disease with detached spur
Synovial proliferation:
Pigmented villonodular synovitis
Neoplastic:
Synovial chondrosarcoma
Other:
Osteochondritis dissecans
Sequestrum from osteomyelitis
Neuropathic (Charcot) jointIntra-articular bodies in SOC typically have popcorn calcification, with a dense sclerotic border with radiolucent central region. This distinct radiographic appearance sets it apart from other causes of intra-articular bodies. Number and size of intra-articular bodies can prove helpful as well. SOC typically presents as multiple intra-articular bodies. Few or isolated intra-articular bodies are more consistent with trauma or osteoarthritis. Classification
Classification is divided into primary versus secondary SOC. Primary SOC occurs in an otherwise normal joint. It is suggested by monoarticular involvement in a patient in the third to fifth decades of life. Secondary SOC occurs in older patients in joints previously affected by joint disease such as osteoarthritis. This pattern is suggested by bilateral involvement with multiple joint intra-articular bodies. Treatment
Asymptomatic patients do not require therapy. Symptomatic patients should undergo arthroscopic or surgical removal of intra-articular bodies.
Vaginal lubrication is a naturally produced fluid that lubricates a 
vagina. Vaginal lubrication is always present, but production increases significantly near ovulation and during sexual arousal in anticipation of sexual intercourse. Vaginal dryness is the condition in which this lubrication is insufficient, and sometimes artificial lubricants are used to augment it. Without sufficient lubrication, sexual intercourse can be painful. The vaginal lining has no glands, and therefore the vagina must rely on other methods of lubrication. Plasma from vaginal walls due to vascular engorgement is considered to be the chief lubrication source, and the Bartholins glands, located slightly below and to the left and right of the introitus (vaginal opening), also secrete mucus to augment vaginal-wall secretions. Near ovulation, cervical mucus provides additional lubrication. Vaginal discharge
Composition
The lubricating fluid can vary in consistency, texture, taste, color, and odor, depending on sexual arousal, the phase of the menstrual cycle, the presence of an infection, certain drugs, genetic factors, and diet.Vaginal fluid is slightly acidic and can become more acidic with certain sexually transmitted diseases. The normal pH of vaginal fluid is between 3.8 and 4.5, contrasting with male semen which is typically between 7.2 and 7.8 (neutral pH is 7.0).During arousal, vaginal lubrication, also sometimes called "arousal fluid", is produced. This is clear, thin, and slippery. It typically only lasts up to an hour. Colloquially, this is referred to as "getting wet". Production
The human vagina is serviced by nerves that respond to vasoactive intestinal polypeptide (VIP).