Am. J. Respir. Crit. Care Med., Volume 164, Number 4, August 2001, 661-668

Mutational and Radiographic Analysis of Pulmonary Disease Consistent with Lymphangioleiomyomatosis and Micronodular Pneumocyte Hyperplasia in Women with Tuberous Sclerosis

DAVID NEAL FRANZ, ALAN BRODY, CRISTOPHER MEYER, JENNIFER LEONARD, GAIL CHUCK, SANDRA DABORA, GOPALAN SETHURAMAN, THOMAS V. COLBY, DAVID J. KWIATKOWSKI, and FRANCIS X. MCCORMACK

Departments of Pediatrics, Neurology, Radiology, and Medicine, Division of Pulmonary and Critical Care Medicine, and the Center for Biostatistical Services, University of Cincinnati College of Medicine, Cincinnati, Ohio; Department of Pathology and Laboratory Medicine, Mayo Clinic, Scottsdale, Arizona; and Department of Medicine, Division of Hematology, Brigham and Women's Hospital, Boston, Massachussetts

Lymphangioleiomyomatosis (LAM) and multifocal micronodular pneumocyte hyperplasia (MMPH) produce cystic and nodular disease, respectively, in the lungs of patients with tuberous sclerosis. The objective of this study was to prospectively characterize the prevalence, clinical presentation, and genetic basis of lung disease in TSC. We performed genotyping and computerized tomographic (CT) scanning of the chest on 23 asymptomatic women with tuberous sclerosis complex (TSC). Cystic pulmonary parenchymal changes consistent with LAM were found in nine patients (39%). These patients tended to be older than cyst-negative patients (31.9 ± 7.6 yr versus 24.8 ± 11.6 yr, p = 0.09). There was no correlation between presence of cysts and tobacco use, age at menarche, history of pregnancy, or estrogen-containing medications. Three of the cyst-positive patients had a prior history of pneumothorax. Pulmonary function studies revealed evidence of gas trapping but normal spirometric indices in the cyst-positive group. All nine cyst-positive patients had angiomyolipomas (AML), which were larger (p < 0.05) and more frequently required intervention (p = 0.08) than cyst-negative patients (8 of 14 with AMLs, p < 0.05). Ten patients (43%) had pulmonary parenchymal nodules. Pulmonary nodules were more common in women with cysts (78% versus 21%, p < 0.05), and 52% of all patients had either cystic or nodular changes. TSC2 mutations were identified in all cyst-positive patients who were tested (n = 8), whereas both TSC1 and TSC2 mutations were found in patients with nodular disease. Correlation of the mutational and radiographic data revealed one pair of sisters who were discordant for cystic disease, two mother- daughter pairs who were discordant for nodular disease, and no clear association between cyst development and a specific mutational type. This prospective analysis demonstrates that cystic and nodular pulmonary changes consistent with LAM and MMPH are common in women with TSC.

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