[Osteoporosis as a first manifestation of systemic mastocytosis. Study of 6 cases].
OBJECTIVE
We describe 6 cases of secondary osteoporosis due to systemic mastocytosis diagnosed in the last 6 years.


RESULTS
Three females and 3 males, age range: 47-66 years, diagnosed with osteoporosis were subsequently diagnosed with systemic mastocytosis. Diagnosis delay: 0.5-17 years. Cutaneous involvement was present in 3 patients, hematologic involvement in 2 patients and gastrointestinal involvement in 2 patients. Histamine levels in urine were elevated in all cases. Four patients had fractures. Treatment with bisphosphonates was started. After 3 years the values of bone mineral density (BMD) improved in the 5 patients evaluated. Two patients had new vertebral fractures and started teriparatide.


CONCLUSIONS
Osteoporosis is an unfrequent initial manifestation of systemic mastocytosis. These patients have a high risk of fractures. Our results suggest that although bisphosphonates improve the bone mineral density the risk of fractures persists.
Sallés
Meritxell
M
Servicio de Reumatología, CAP Bages, Centre Hospitalari, Manresa, Barcelona, España. 35814ms@lcomb.es
Holgado
Susana
S
Navarro
José-Tomás
JT
Ribera
Josep-Maria
JM
Riera
Elena
E
Millà
Fuensanta
F
Tena
Xavier
X
D000368:Aged; D005260:Female; D006801:Humans; D008297:Male; D034721:Mastocytosis, Systemic / Q000150:complications*; D008875:Middle Aged; D010024:Osteoporosis / Q000209:etiology*