Joint pain.

A subjective feeling of tiredness characterized by a lack of energy and motivation.

A swan neck deformity describes a finger with a hyperextended PIP joint and a flexed DIP joint. The most common cause for a swan neck-like deformity is a disruption of the end of the extensor tendon. Conditions that loosen the PIP joint and allow it to hyperextend, for example conditions that weaken the volar plate, can produce a swan neck deformity of the finger. One example is rheumatoid arthritis. Another cause are conditions that tighten up the small (intrinsic) muscles of the hand and fingers, for example hand trauma or nerve disorders, such as cerebral palsy, Parkinson's disease, or stroke.

Inflammation of blood vessel.

Reduction of total body weight.

Rheumatoid arthritis is an inflammatory disease, primarily of the joints, with autoimmune features and a complex genetic component.

The presence of swelling in a joint.

Inflammation of the flexor digitorum tendon, often associated with the Kanavel signs

Joint stiffness is a perceived sensation of tightness in a joint or joints when attempting to move them after a period of inactivity. Joint stiffness typically subsides over time.

Pain and inflammation in more than five joints.

The presence in the serum of an autoantibody directed against the Fc portion of IgG.

The presence autoantibodies in the serum that react do different citrullinated antigens, including filaggrin, fibrinogen, vimentin and collagen.

Body temperature elevated above the normal range.

An increased erythrocyte sedimentation rate (ESR). The ESR is a test that measures the distance that erythrocytes have fallen after one hour in a vertical column of anticoagulated blood under the influence of gravity. The ESR is a nonspecific finding. An elevation may indicate inflammation or may be caused by any condition that elevates fibrinogen.

An abnormal elevation of the C-reactive protein level in the blood circulation.

Rheumatoid arthritis is an inflammatory disease, primarily of the joints, with autoimmune features and a complex genetic component.

Felty syndrome (FS), also known as ''super rheumatoid'' disease, is a severe form of rheumatoid arthritis (RA), characterized by a triad of RA, splenomegaly and neutropenia, resulting in susceptibility to bacterial infections.

Sjogren syndrome is an autoimmune disease that mainly affects the exocrine glands. It is clinically characterized by keratoconjunctivitis sicca and xerostomia (Goransson et al., 2006). See 200400 for association of Sjogren syndrome with achalasia in sisters.

Spondyloenchondrodysplasia with immune dysregulation (SPENCDI) is an immunoosseous dysplasia combining the typical metaphyseal and vertebral bone lesions of spondyloenchondrodysplasia (SPENCD) with immune dysfunction and neurologic involvement. The skeletal dysplasia is characterized by radiolucent and irregular spondylar and metaphyseal lesions that represent islands of chondroid tissue within bone. The vertebral bodies show dorsally accentuated platyspondyly with disturbance of ossification. Clinical abnormalities such as short stature, rhizomelic micromelia, increased lumbar lordosis, barrel chest, facial anomalies, and clumsy movements may be present (Menger et al., 1989). Central nervous system involvement includes spasticity, mental retardation, and cerebral calcifications, and immune dysregulation ranges from autoimmunity to immunodeficiency. Neurologic and autoimmune manifestations have been observed in different combinations within a single family, suggesting that this disorder may be defined by specific radiographic features but has remarkably pleiotropic manifestations (Renella et al., 2006). Briggs et al. (2016) also noted variability in skeletal, neurologic, and immune phenotypes, which was sometimes marked between members of the same family. Classification of the Enchondromatoses In their classification of the enchondromatoses, Spranger et al. (1978) called Ollier disease and Maffucci syndrome types I and II enchondromatosis, respectively; metachondromatosis (156250), type III; and spondyloenchondrodysplasia (SPENCD), also called spondyloenchondromatosis, type IV; enchondromatosis with irregular vertebral lesions, type V; and generalized enchondromatosis, type VI. Halal and Azouz (1991) added 3 tentative categories to the 6 in the classification of Spranger et al. (1978). Pansuriya et al. (2010) suggested a new classification of enchondromatosis (multiple enchondromas).

Achalasia is a primary motor disorder of the esophagus. It is characterized by aperistalsis and a failure of the lower esophageal sphincter to relax due to a loss of inhibitory nitrinergic neurons in the esophageal myenteric plexus. Patients typically present with dysphagia, regurgitation, retrosternal pain, and substantial weight loss (summary by Farrokhi and Vaezi, 2007 and Gockel et al., 2010).