nodule

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nodule:

see concretionconcretion,
mass or nodule of mineral matter, usually oval or nearly spherical in shape, and occurring in sedimentary rock. It is formed by the accumulation of mineral matter in the pore spaces of the sediment, usually around a fossil or fossil fragment acting as a nucleus.
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nodule

[′näj·ül]
(anatomy)
A small node.
A small aggregation of cells.
(botany)
A bulbous enlargement found on roots of legumes and certain other plants, whose formation is stimulated by symbiotic, nitrogen-fixing bacteria that colonize the roots.
(geology)
A small, hard mass or lump of a mineral or mineral aggregate characterized by a contrasting composition from and a greater hardness than the surrounding sediment or rock matrix in which it is embedded.
(medicine)
A primary skin lesion, seen as a circumscribed solid elevation.

nodule

1. any of the knoblike outgrowths on the roots of clover and many other legumes: contain bacteria involved in nitrogen fixation
2. Anatomy any small node or knoblike protuberance
3. a small rounded lump of rock or mineral substance, esp in a matrix of different rock material
References in periodicals archive ?
Because incidentally detected, solitary pulmonary nodules are increasingly common, systematic evaluation of these patients is essential.
Dual time-point FDG PET-CT for differentiating benign from malignant solitary pulmonary nodules in a TB endemic area.
Background: The detection of solitary pulmonary nodules (SPNs) that may potentially develop into a malignant lesion is essential for early clinical interventions.
A solitary pulmonary nodule, or "coin lesion," is an intraparenchymal finding on chest radiograph or CT that is less than 3 to 4 cm in diameter and not associated with atelectasis or adenopathy.
Surgical resection is the diagnostic and therapeutic procedure of choice for isolated peripheral pulmonary masses and new solitary pulmonary nodules without benign features in those with no evidence of mediastinal or distant disease.
In a study conducted by Shetty et al, (8) Solitary Pulmonary Nodule was the most common presenting findings followed by a central lesion and then by a peripheral mass lesion.
Table 1: Differential diagnosis: Solitary pulmonary nodule Infectious Granuloma Mycobacteria Fungus Sarcoidosis (rare) Organizing pneumonia Lung abscess (or septic embolus) Round pneumonia Fungal pneumonia Neoplastic Benign Hamartoma Inflammatory (myofibroblastic) pseudotumor Sclerosing hemangioma Granular cell tumor Malignant Bronchogenic carcinoma Solitary metastasis Carcinoid/atypical carcinoid tumor Vascular Arteriovenous malformation Pulmonary infarct Hematoma Pulmonary artery aneurysm Lymphatic Intrapulmonary lymph node Lymphoma Congenital Bronchogenic cyst Inflammatory Rheumatoid nodule Wegener's granulomatosis Airway Mucoid impaction (bronchiectasis) Miscellaneous Rounded atelectasis Amyloidosis
2 cm solitary pulmonary nodule located at the right perihilar location was detected in her chest X ray but patient did not accept any further intervention and remained asymptomatic upto date (Figure-1a).
When is a CT scan indicated to examine a solitary pulmonary nodule found on a chest x-ray film?