Exact(9)
Sometimes, a central or peripheral mechanism can be highlighted but without any etiology being identified.
ECD is a rare non-Langerhans cell histiocytosis of unknown etiology, being a multisystemic xanthogranulomatous infiltration with almost constant bone involvement.
According to the case-referent study conducted by Newton et al in Uganda, with a referent group of cancers not related to an infectious etiology, being HIV-infected was only associated with a slight risk of HCC (OR 1.2 95%% CI 0.3 4.2)) [23].
In 152 patients (81.2%, 95% CI 75.0, 86.2), the lesion was finally diagnosed to be malignant, the most common etiology being pancreatic adenocarcinoma.
However, many cases of fetal ductal constriction, as well as of persistent neonatal pulmonary artery hypertension, remain without an established etiology, being referred as "idiopathic".
However, many cases of fetal ductal constriction, as well as of persistent neonatal pulmonary artery hypertension, remain without an established etiology, being referred as "idiopathic" (Shima et al., 2011).
Similar(51)
Its etiology is uncertain.
Their etiology is mainly unknown.
The bacterial etiology is often polymicrobial.
The etiology was therefore labeled as idiopathic.
ARF etiology was not associated with mortality.
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