대한흉부영상의학회 Weekly Chest Cases

Case No : 1331 Date 2023-04-23

Courtesy of Eunji Lee, Jooae Choe, Mi Young Kim / Asan medical center
Age/Sex 32 / M
Chief ComplaintAbnormal findings detected on chest radiograph for regular check-up. History: none

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Diagnosis With Brief Discussion

Diagnosis: Dendriform pulmonary ossification
Radiologic Findings: Fig 1. Chest PA shows diffuse reticulonodular opacities predominantly in the peripheral and lower lung zone.
Fig 2, 4. Axial and coronal CT scans with lung window setting show tiny nodules along the interstitium with linear or branching opacities in both lungs.
Fig 3, 5. Axial and coronal CT scans with mediastinal window setting show foci of calcifications in some of the nodules and linear opacities.
Fig 6. Compared with the coronal CT scans performed 2 years later, tiny nodules and linear opacities slightly increased.

The patient underwent bronchoscopic biopsy and the pathologic examination confirmed the presence of multifocal ossification.
Brief Review: Pulmonary ossification is an unusual condition of unknown etiology and has been recognized in the following 2 forms: granular (nodular) and dendriform. The nodular type of ossification has been linked to passive congestion due to chronic heart failure, mitral stenosis, and hypertrophic subaortic stenosis. Dendriform pulmonary ossification (DPO) has been most often described in association with primary lung diseases including idiopathic pulmonary fibrosis. DPO is less common than the nodular type.

DPO is classified along with nodular pulmonary ossification as a form of diffuse pulmonary ossification. DPO and nodular pulmonary ossification occur in very different clinical situations and have unique CT appearances. Nodular pulmonary ossification, in which ectopic bone is present in the alveolar spaces, occurs in the setting of chronically elevated pulmonary venous pressures particularly due to chronic mitral stenosis or left heart failure. Nodular pulmonary ossification represents pathologic ossification in areas of chronic airspace hemosiderosis and organizing pneumonia; histologically, the bone elements do not contain marrow elements (fat or hematopoietic cells). The CT appearance is that of small centrilobular nodules, often of high attenuation, with a lower lobe predominance that may coalesce. DPO is a process in which metaplastic ectopic bone is present within the lung. Pathologically, the bony deposits are in the alveolar walls and the peripheral interstitium, including the interlobular septa and subpleural and perifissural regions; the bony spicules form a contiguous branching pattern, resulting in a lattice-like appearance or dendrite. The CT appearance of DPO is characteristic, but there have been limited descriptions of CT findings in patients who do not have pulmonary fibrosis. Small nodules, several millimeters in diameter, are present in the peripheral interstitium (interlobular septa and subpleural and perifissural spaces) and form contiguous, branching structures resembling tree branches in the affected areas. The deposition of DPO correlates with the underlying structure of the parenchymal peripheral interstitium. Significant lobular distortion, traction bronchiolectasis, and honeycombing are absent. High attenuation, reflecting the underlying ossification, can be identified in some but not all nodules; microscopic ossification may not be visible on CT, and thin sections and maximum-intensity-projection images are helpful in the detection of small high-attenuation foci.
No specific treatment or management guidelines are published for patients with DPO alone. Bronchoscopy with transbronchial biopsies is a useful tool for diagnosing dendriform pulmonary ossification.
References: 1.
Keywords

No. of Applicants : 81

▶ Correct Answer : 30/81, 37.0%

- Chonnam National University Hwasun Hospital , Korea (South) KWANGKUN CHO
- , Japan HIROAKI ARAKAWA
- , Japan KYOKO NAGAI
- Chonnam National University Hwasun Hospital , Korea (South) SEONGWOO CHO
- Healthy Longevity Medical Center , Japan SHIN-ICHI CHO
- Chonnam National University Hwasun Hospital , Korea (South) DONGHUN HAN
- Vita Hospital , Brazil DIOGO LAGO PINHEIRO
- Oita University, Faculty of Medicine , Japan FUMITO OKADA
- The University of Tokyo Hospital , Japan WATARU GONOI
- Qatif Central Hospital , Saudi Arabia HANI MAKKY ALSALAM
- Osaka University , Japan AKINORI HATA
- The University of Tokyo Hospital , Japan TOSHIHIRO FURUTA
- Gifu University Hospital , Japan Yo Kaneko
- Osaka Metropolitan University Hospital , Japan SHU MATSUSHITA
- University of Tsukuba, Dept of Radiology , Japan MANABU MINAMI
- Dokkyo Medical University , Japan HIROAKI ARAKAWA
- Chonnam National University Hospital , Korea (South) GYERYEONG PARK
- , China MING LU
- Chonnam National University Hospital , Korea (South) KIM SANG GYUN
- Kyoto University , Japan SHO KOYASU
- Yonsei University,Severance Hospital , Korea (South) SEO BUM CHO
- Kantou Rousai Hospital , Japan KAORU SUMIDA
- Ichinomiya Nishi Hospital , Japan Takao Kiguchi
- Matsunami General Hospital , Japan TARO TAKEDA
- Chonnam National University Hospital , Korea (South) SEUNG WAN KANG
- , Japan YUMI MAEHARA
- Toyota Kosei Hospital , Japan YUKI HAYASHI
- , Korea (South) HM PARK
- Kyoto university , Japan AKIHIKO SAKATA
- Other , Korea (South) YONG HO JANG

▶ Correct Answer as Differential Diagnosis : 2/81, 2.5%

- McGill University Health Center , Canada ALEXANDRE SEMIONOV
- Inje University Pusan Paik Hospital , Korea (South) GANGWON JEONG

▶ Semi-Correct Answer : 5/81, 6.2%

- Other , Korea (South) SEONGSU KANG
- Kaneda hospital , Japan HIROFUMI MIFUNE
- Inje University Pusan Paik Hospital , Korea (South) JIYEON HAN
- Ajou University Hospital , Korea (South) JAYOUNG MOON
- Nerimahikarigaoka hospital , Japan TAKANA HAYASHI

대한흉부영상의학회 Korean Society of Thoracic Radiology

Cases by Disease Category

Case No : 1331 Date 2023-04-23

Discussion

No. of Applicants : 81