Joint pain.

Increased numbers of mesangial cells per glomerulus, defined as more than 3 nuclei fully surrounded by matrix in one or more mesangial areas, not including perihilar region, on a standard 3-micron-thick tissue section, best evaluated on periodic acid-Schiff (PAS) stain.

Pulmonary hemorrhage is a bleeding within the lungs. Older children and adults may spit blood or bloody sputum. Neonates, infants and young children usually do not spit up blood. Anemia, pulmonary infiltrates, increasingling bloody return on BAL and the presence of hemosiderin-laden macrophages in broncho-alveolar lavage (BAL) fluid or lung biopsy can diagnose lung bleeding. Alveolar macrophages contain phagocytosed red blood cells and stain positive for hemosiderin, a product of hemoglobin degradation, after about 48-72 hours following pulmonary hemorraghe. Previous or recurrent bleeding can thus be distinguished from fresh events. A differentiation into local or diffuse is of importance. Also differentiate if pulmonary hemorrhage is due to a primary lung disorder or a manifestation of a systemic disease.

Inflammation of a joint.

A sudden, audible expulsion of air from the lungs through a partially closed glottis, preceded by inhalation.

Difficult or labored breathing. Dyspnea is a subjective feeling only the patient can rate, e.g., on a Borg scale.

Very rapid breathing.

A functional defect characterized by reduced total lung capacity (TLC) not associated with abnormalities of expiratory airflow or airway resistance. Spirometrically, a restrictive defect is defined as FEV1 (forced expiratory volume in 1 second) and FVC (forced vital capacity) less than 80 per cent. Restrictive lung disease may be caused by alterations in lung parenchyma or because of a disease of the pleura, chest wall, or neuromuscular apparatus.

Reduced ability of the lungs to transfer gas from inspired air to the bloodstream as measured by the diffusing capacity of the lungs for carbon monoxide (DLCO) test.

Hemosiderin-laden macrophages (HLM) in bronchoalveolar lavage (BAL) fluid were originally known as adiagnostic biomarker of alveolar hemorrhage, but have also been observed in idiopathic pulmonary fibrosis (IPF) with histopathological pattern of usual interstitial pneumonia (UIP).

Abnormality of the lung parenchyma extending to the pulmonary interstitium and leading to diffuse pulmonary fibrosis.

The presence of autoantibodies in the serum that react against nuclei or nuclear components.

A type of extracapillary glomerulonephritis characterized by the formation of crescent-like cellular proliferation.

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.