Clinical features and imaging findings in pulmonary capillary hemangiomatosis： report of two cases and a pooled analysis

Background Pulmonary capillary hemangiomatosis （PCH） is a rare disease and no Chinese case has been reported yet. The disease is often misdiagnosed and its clinical characteristics are incompletely described. The aim of this study was to describe two Chinese cases and to clarify the clinical and radiographic parameters of patients with PCH. Methods Two PCH cases were presented and other cases were searched from the English literature. All available clinical and radiographic data were collected from 62 literature reported PCH cases. A pooled analysis of total 64 cases was made. Results Dyspnea and hemoptysis were the most common clinical symptoms of PCH. Pulmonary hypertension （PH） was found in 78% of the reported cases. PCH typically showed characteristic diffuse or patchy ground-glass opacities （GGOs） and/or multiple ill-defined centrilobular nodules in the computed tomography. Conclusions The diagnosis of PCH requires a high clinical suspicion. However, both clinical presentations and radiographic studies often provide clues to the diagnosis, which may prompt early lung biopsy for a definite diagnosis.