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2017 ; 18
(1
): 100
Nephropedia Template TP
gab.com Text
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English Wikipedia
Steroid-resistant nephrotic syndrome as the initial presentation of nail-patella
syndrome: a case of a de novo LMX1B mutation
#MMPMID28335748
Nakata T
; Ishida R
; Mihara Y
; Fujii A
; Inoue Y
; Kusaba T
; Isojima T
; Harita Y
; Kanda C
; Kitanaka S
; Tamagaki K
BMC Nephrol
2017[Mar]; 18
(1
): 100
PMID28335748
show ga
BACKGROUND: Nail-patella syndrome (NPS) is an autosomal dominant disorder caused
by mutations in the LMX1B gene and is characterized by nail dysplasia, skeletal
abnormalities, and nephropathy. We herein report a case of steroid-resistant
nephrotic syndrome (SRNS) prior to overt orthopedic symptoms in a patient with
NPS. CASE PRESENTATION: A 24-year-old woman presented to our hospital with knee
pain. She had poorly developed nails, hypoplastic patellas, dislocation of the
elbows, and iliac horns in the pelvis. At the age of 7, she developed nephrotic
syndrome and was diagnosed with primary focal segmental glomerulosclerosis by
renal biopsy. She received long-term corticosteroid therapy with no obvious
response. Her clinical course and orthopedic manifestations indicated NPS, and a
genetic analysis showed a de novo mutation in the LMX1B gene (c.819?+?1G?>?A).
Nephropathy in this case was considered to be associated with NPS. Therefore, we
discontinued corticosteroids without the exacerbation of nephrotic syndrome.
CONCLUSIONS: Patients with NPS may develop nephrotic syndrome prior to overt
orthopedic symptoms and only show non-specific findings in renal biopsy at an
early stage of NPS nephropathy. Hereditary nephrotic syndrome, often presenting
as childhood-onset SRNS, may also be difficult to diagnose in patients with the
following conditions: renal symptoms prior to overt extrarenal symptoms, de novo
mutations, and non-specific findings in renal biopsy. Therefore, in the
management of SRNS in children, we need to reconsider the possibility of
hereditary diseases such as NPS even without a family history.