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is a significant concern for physicians. Central6 g5 w% e& A, H
precocious puberty (CPP), which is mediated
! N4 z; j6 e0 }8 j* _- n& Hthrough the hypothalamic pituitary gonadal axis, has
+ ^; o) `% W8 r; j0 Y& sa higher incidence of organic central nervous system
& J) `3 A. q* f! T! E; blesions in boys.1,2 Virilization in boys, as manifested4 i; l0 S- N! u+ p/ V
by enlargement of the penis, development of pubic
) _$ Y2 m- ~" F. ~* N/ Jhair, and facial acne without enlargement of testi-; u6 W5 x# k: `0 s4 f
cles, suggests peripheral or pseudopuberty.1-3 We
0 R3 G% r9 L/ J: E% \6 w0 E& Lreport a 16-month-old boy who presented with the! B0 H/ O5 v# M' Z9 B
enlargement of the phallus and pubic hair develop-
, O% R5 } B4 r0 F3 `ment without testicular enlargement, which was due) F5 ?) E- d" E' @6 P7 ?$ e
to the unintentional exposure to androgen gel used by
/ R) Z1 `+ b8 ithe father. The family initially concealed this infor-
3 s$ |2 O9 j& c5 H. d0 P$ y. Umation, resulting in an extensive work-up for this- Y' }+ H+ T! v/ c1 N1 H
child. Given the widespread and easy availability of
$ m7 v" n$ t( [: P. o. Y+ |2 Mtestosterone gel and cream, we believe this is proba-
: i7 L9 Q$ G: T2 l! @5 B3 R$ lbly more common than the rare case report in the; n/ g: ~- F( ^
literature.4! t3 n# ]# D; f; \
Patient Report7 }( R+ m# w7 n9 ]0 _' K
A 16-month-old white child was referred to the4 [' _: ?/ J7 S! X
endocrine clinic by his pediatrician with the concern; C9 T$ D% A) C
of early sexual development. His mother noticed
+ P, i* i+ s7 J% } r0 Y) X! Xlight colored pubic hair development when he was" Y |3 {% j! ~8 F* L" L
From the 1Division of Pediatric Endocrinology, 2University of; z6 R* S- U' |; A! `3 n
South Alabama Medical Center, Mobile, Alabama.( Q! W& j& O4 l8 ^4 v
Address correspondence to: Samar K. Bhowmick, MD, FACE,
. B6 d# |0 E( n' d: zProfessor of Pediatrics, University of South Alabama, College of
! t" p& o/ a' O0 v1 eMedicine, 2451 Fillingim St. Mastin 212, Mobile, AL 36617-2297;
, D/ v6 \7 J( Z' U1 s& _e-mail: [email protected].
9 ]$ ^9 L; p ]/ w0 T0 c# s5 Oabout 6 to 7 months old, which progressively became4 H, n: B. m/ K% X8 ^
darker. She was also concerned about the enlarge-
0 C0 K: ^9 d# i: Z" o7 Z7 U( Tment of his penis and frequent erections. The child/ x- J& H, Z7 H/ n" U/ ~( \9 `
was the product of a full-term normal delivery, with
/ c5 ^. g$ H6 k: S6 f3 T) J% Oa birth weight of 7 lb 14 oz, and birth length of
" p. W" _- \: q! y# N% O' n5 x20 inches. He was breast-fed throughout the first year, m$ d" _. _+ ?( T
of life and was still receiving breast milk along with
5 d* v J) b4 Q# k2 r7 U7 asolid food. He had no hospitalizations or surgery,( g# C7 S# D5 Q9 t! [
and his psychosocial and psychomotor development: i$ ^# r s* X
was age appropriate.
! r, a7 ~ m4 H( e% RThe family history was remarkable for the father," F& }" \0 S* B
who was diagnosed with hypothyroidism at age 16,) K& C' U+ g; q" K+ d
which was treated with thyroxine. The father’s7 M: e1 I% j+ w2 a! r
height was 6 feet, and he went through a somewhat; }$ d5 B) _- O3 |+ d8 g& d3 l8 k
early puberty and had stopped growing by age 14.
; `0 O- H0 V% I. N6 nThe father denied taking any other medication. The4 y! L; _1 H. M6 U2 A. C5 T
child’s mother was in good health. Her menarche7 r$ y% x% b5 l3 ]9 P- H* c0 G6 M
was at 11 years of age, and her height was at 5 feet
5 p9 `+ I) {5 J6 I: C; \8 S1 D5 inches. There was no other family history of pre-( r6 f' U# B( U6 d* d
cocious sexual development in the first-degree rela-/ M4 W, ^* ?, \3 s8 `$ [4 D
tives. There were no siblings.
' G/ t$ e7 O) Y9 |Physical Examination+ Q. Y/ E1 z" S( e: g
The physical examination revealed a very active,
3 o9 n% Q: ]: Q0 | wplayful, and healthy boy. The vital signs documented
" z; q9 \7 M) A$ ^a blood pressure of 85/50 mm Hg, his length was
2 h+ z+ {% ?# r0 N6 B& `90 cm (>97th percentile), and his weight was 14.4 kg) V7 h9 ~) z. V% q% ?& T5 c9 N
(also >97th percentile). The observed yearly growth t6 P8 G: X6 z3 G1 }0 L
velocity was 30 cm (12 inches). The examination of, E( V" f) N$ f( E, e
the neck revealed no thyroid enlargement.5 h6 f& Y$ k' b; s3 t. A, n( ~
The genitourinary examination was remarkable for- O5 B; c/ l! }. X- y; m4 ]4 M
enlargement of the penis, with a stretched length of
$ R) ?1 r" U- H' i7 h% K8 cm and a width of 2 cm. The glans penis was very well
I, s6 m) d3 U/ R0 P% edeveloped. The pubic hair was Tanner II, mostly around
, b. Z; `, B2 k E4 c% l540
4 \+ V" q- r$ A+ a% \" d7 W& U/ gat University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
' U6 K7 V4 s: B" Ithe base of the phallus and was dark and curled. The# E. Q! [2 s* i$ C! q" G9 I
testicular volume was prepubertal at 2 mL each.
' ~. g2 Y. { x* HThe skin was moist and smooth and somewhat- M( j! x! q( u* k4 A1 q$ u
oily. No axillary hair was noted. There were no, M( @- |9 k4 `3 H
abnormal skin pigmentations or café-au-lait spots.: d+ R) |1 J9 y* @; ?" x. o
Neurologic evaluation showed deep tendon reflex 2+" m" L5 R9 l, O6 ]$ k" a
bilateral and symmetrical. There was no suggestion
3 @5 U# C0 A) I3 E) [1 y$ Dof papilledema.
3 R! w0 Q& S3 @8 H3 aLaboratory Evaluation6 [5 A! |% Y" K& t
The bone age was consistent with 28 months by! f( J' K0 R( c: u
using the standard of Greulich and Pyle at a chrono-
9 M p) o j( m( }logic age of 16 months (advanced).5 Chromosomal
4 ^" P' t2 X( d; R! n& Pkaryotype was 46XY. The thyroid function test0 T3 M& f H" t
showed a free T4 of 1.69 ng/dL, and thyroid stimu-; P3 A+ c/ E+ U1 @- ~0 _7 O( k. T
lating hormone level was 1.3 µIU/mL (both normal).
3 o# o$ T! k# l4 }/ ?: fThe concentrations of serum electrolytes, blood9 x6 E( I. m3 ^. }# V
urea nitrogen, creatinine, and calcium all were
* E6 U$ q5 s" m2 n& m# jwithin normal range for his age. The concentration
1 H/ F! b$ G! B) R. K7 Jof serum 17-hydroxyprogesterone was 16 ng/dL
) b9 h/ X0 x# Q: R" B(normal, 3 to 90 ng/dL), androstenedione was 20
! J' m' Q* i' s; [ng/dL (normal, 18 to 80 ng/dL), dehydroepiandros-2 x4 ?/ X$ q' x
terone was 38 ng/dL (normal, 50 to 760 ng/dL),
( c) f9 V% v0 \5 s2 E; W( U3 C9 Q: fdesoxycorticosterone was 4.3 ng/dL (normal, 7 to
( M! V% u# `& ?49ng/dL), 11-desoxycortisol (specific compound S)8 x& V& f+ \4 b% L/ Q3 M
was 43 ng/dL (normal, 10 to 156 ng/dL), serum cor-6 E$ _- e, A2 z9 t
tisol was 7.6 µg/dL (normal, 2.8 to 23 µg/dL), total3 L2 H3 W5 ~, H O& J# `- V2 ]
testosterone was 60 ng/dL (normal <3 to 10 ng/dL),3 j) C8 r' ?5 y! c; g8 o+ n
and β-human chorionic gonadotropin was less than" \$ o7 u" n3 w9 A# w
5 mIU/mL (normal <5 mIU/mL). Serum follicular
j- u6 L3 a' k( F, mstimulating hormone and leuteinizing hormone+ t3 \. j! }0 d9 O8 x- D
concentrations were less than 0.05 mIU/mL
6 l! f; @+ i5 _ g: M(prepubertal)./ D) p9 Q' J& s& j, U: M3 J" x
The parents were notified about the laboratory: ^) Q9 [$ k; H7 a9 Q4 L" A9 S
results and were informed that all of the tests were
2 i2 j# ?3 a& ` d5 W" I, f/ Nnormal except the testosterone level was high. The
) l; N9 X6 P* p" ffollow-up visit was arranged within a few weeks to/ T- {# x! i8 L+ z8 C
obtain testicular and abdominal sonograms; how-
; p1 f0 e* L6 @/ rever, the family did not return for 4 months.8 T, O. c6 \9 E1 h" \! I$ v) J
Physical examination at this time revealed that the9 P+ W p# t/ {. s
child had grown 2.5 cm in 4 months and had gained) v% W0 k( D" [2 l, W) I9 a
2 kg of weight. Physical examination remained6 `; ^" R# X9 p' h& P7 S' u
unchanged. Surprisingly, the pubic hair almost com-: B: h5 }# q; y2 e# Q9 r0 a
pletely disappeared except for a few vellous hairs at
$ t0 M0 o& a2 ]- G$ R4 F# p( Ithe base of the phallus. Testicular volume was still 2
' o! G1 G0 u; K: KmL, and the size of the penis remained unchanged.) e/ b* x0 l0 N1 Q6 O. J' ?
The mother also said that the boy was no longer hav-
0 K& }- m8 P3 zing frequent erections., L8 ^% e! V- F
Both parents were again questioned about use of8 t$ ~ {& L0 m4 P: n" J# z4 [
any ointment/creams that they may have applied to
9 U3 K( ~3 r4 Wthe child’s skin. This time the father admitted the% R9 U# {% N5 Y( @+ t' G
Topical Testosterone Exposure / Bhowmick et al 541, l- F/ S0 L; @+ X) I* z
use of testosterone gel twice daily that he was apply-
6 z/ r$ J, A9 p; d4 ~" @* Jing over his own shoulders, chest, and back area for
& P8 Y7 G, P2 ]/ V; O: R; x# |a year. The father also revealed he was embarrassed
# u& b' `# \8 u% J% G* Q) R- E2 Rto disclose that he was using a testosterone gel pre-/ ]* {( B: i3 h! B5 K3 N7 W- g, Z8 u# S
scribed by his family physician for decreased libido
$ L0 m. P4 _$ _( Lsecondary to depression., m* Y) ]. |6 h0 m+ q8 B# z! J5 i
The child slept in the same bed with parents.
; D; w3 a1 {. w1 P% O, wThe father would hug the baby and hold him on his ]$ G+ }. Y0 f. _! O* ?3 i
chest for a considerable period of time, causing sig-1 ]0 W5 J) F" ?9 G1 A) h& x; u; r
nificant bare skin contact between baby and father.
8 G4 f1 _$ o" e- VThe father also admitted that after the phone call,
0 x! V* U" T- d* ]( lwhen he learned the testosterone level in the baby
2 g% y; d8 `% h) qwas high, he then read the product information; l: c. a) t- _( D) A' U, ?
packet and concluded that it was most likely the rea-- m) q( _1 R2 F# o1 V" |8 ^% A
son for the child’s virilization. At that time, they% v+ O# B2 a8 N/ e. }
decided to put the baby in a separate bed, and the
: A2 ^7 h& u6 cfather was not hugging him with bare skin and had
8 v* u; r( Y0 U/ B2 H" k/ C: vbeen using protective clothing. A repeat testosterone- `1 w4 ^! o6 ]+ P% ~
test was ordered, but the family did not go to the Q$ \; k" l" ~; k3 u) d1 }$ s
laboratory to obtain the test.
7 }: G! e) Q2 i5 J8 _& ~) }4 NDiscussion
# B }/ j ]) f8 K: O/ V iPrecocious puberty in boys is defined as secondary5 v# b' w6 r8 y: U2 [2 R" a
sexual development before 9 years of age.1,4
2 j+ H+ P" T8 Y9 pPrecocious puberty is termed as central (true) when6 y, `5 k( b& u) L$ {
it is caused by the premature activation of hypo-
- y! u1 ?+ Z. \+ E1 `; S4 m" Q q% fthalamic pituitary gonadal axis. CPP is more com-
3 X, P" @, c9 Qmon in girls than in boys.1,3 Most boys with CPP; L! @* C2 y6 S. s; c
may have a central nervous system lesion that is
- @! w9 D( r( k. S8 b5 Kresponsible for the early activation of the hypothal-6 l# T* L# O, s4 z8 S4 a
amic pituitary gonadal axis.1-3 Thus, greater empha-8 m5 @1 g. ?" R0 U) z
sis has been given to neuroradiologic imaging in
& k) i% A: ^6 ^. c8 F0 Vboys with precocious puberty. In addition to viril-; z% i8 c5 ~2 S5 l" o
ization, the clinical hallmark of CPP is the symmet-
0 l9 b0 X: r3 {$ hrical testicular growth secondary to stimulation by
; e' ~3 L3 R7 q% g, d$ rgonadotropins.1,3) l3 e7 C" E, Q7 ~3 O
Gonadotropin-independent peripheral preco- X8 ?# R/ T$ `- [
cious puberty in boys also results from inappropriate
q9 @5 i# z4 N! \3 landrogenic stimulation from either endogenous or
2 Z$ W; J: \1 @" fexogenous sources, nonpituitary gonadotropin stim-
0 I6 o: K: A6 ^7 F& o7 x* {ulation, and rare activating mutations.3 Virilizing
/ N% D( g3 }6 [2 fcongenital adrenal hyperplasia producing excessive
' \; _. Q/ q9 k; O' Aadrenal androgens is a common cause of precocious
7 y, e+ j6 W/ Apuberty in boys.3,4
4 K0 I: R8 l D; WThe most common form of congenital adrenal
$ U" ?5 o+ I/ c$ khyperplasia is the 21-hydroxylase enzyme deficiency.
; `* S& j) K3 B! YThe 11-β hydroxylase deficiency may also result in
( m' B5 {! m9 h B$ V. G; Wexcessive adrenal androgen production, and rarely,
( |4 y, u& l+ B. j/ Han adrenal tumor may also cause adrenal androgen
4 c+ o+ N1 C- B: ~4 ~1 qexcess.1,3
C) c% ^9 }0 l0 c* E2 @at University of Manchester Library on May 25, 2015 cpj.sagepub.com Downloaded from
8 ^7 m- e) w, t& |% ~" k0 E542 Clinical Pediatrics / Vol. 46, No. 6, July 2007
. T9 k/ t: h# e' [. w9 p$ pA unique entity of male-limited gonadotropin-* E* t9 c. _- m T& u
independent precocious puberty, which is also known, v% `: ~' s1 ` f; E8 U/ h, h F) G- m
as testotoxicosis, may cause precocious puberty at a2 R: T/ C- D. o
very young age. The physical findings in these boys# P! I- F# K6 Z7 |
with this disorder are full pubertal development,
' d& F% ^9 L# ]' mincluding bilateral testicular growth, similar to boys; d( [: k: P( x( m
with CPP. The gonadotropin levels in this disorder
# P! @& G. n8 z' vare suppressed to prepubertal levels and do not show6 G/ ~, N' r" C) L( a8 o
pubertal response of gonadotropin after gonadotropin-
) a* f% \& I" k& preleasing hormone stimulation. This is a sex-linked1 ]5 ?4 L, R# }2 |9 z4 |+ [
autosomal dominant disorder that affects only
8 z, G' r$ }! N- |. R6 {3 kmales; therefore, other male members of the family
5 u, A9 f# a! I) [" P& Bmay have similar precocious puberty.3
" c; ^4 F/ a b+ B4 Z8 P+ s) uIn our patient, physical examination was incon-
) t) T8 k: J7 |6 Y7 F+ C2 Bsistent with true precocious puberty since his testi-$ r! Q* O9 e6 Z& O' ]
cles were prepubertal in size. However, testotoxicosis
, l, a, e$ u- X( \" Wwas in the differential diagnosis because his father# Q3 r2 ?% E. V2 E6 t
started puberty somewhat early, and occasionally,) |# C9 e- S6 Q
testicular enlargement is not that evident in the
& t# n( h( G/ \* Z" P2 n, lbeginning of this process.1 In the absence of a neg-9 w( C) Q4 }. m' X
ative initial history of androgen exposure, our% j- a. @* R, f& f) }6 m0 t6 `7 P0 `
biggest concern was virilizing adrenal hyperplasia,
6 A! w" K- o+ a2 Jeither 21-hydroxylase deficiency or 11-β hydroxylase
+ n" E4 ~; Z+ p( Vdeficiency. Those diagnoses were excluded by find-4 b6 l9 F9 z0 U' ^
ing the normal level of adrenal steroids.
4 ~ |' J- r# r$ lThe diagnosis of exogenous androgens was strongly7 I0 K" v% Q: \- ?
suspected in a follow-up visit after 4 months because
$ `+ n5 w' n* U* xthe physical examination revealed the complete disap-
" p* v. ~3 |3 I( o' J7 Upearance of pubic hair, normal growth velocity, and1 `$ _- ]+ K' q- l2 g
decreased erections. The father admitted using a testos-" |$ D% o. b6 w8 a
terone gel, which he concealed at first visit. He was
! H- Y1 M( v7 `using it rather frequently, twice a day. The Physicians’
3 G3 e" ?$ D4 N% w7 HDesk Reference, or package insert of this product, gel or
" x# ^, F! ]6 ^7 q/ o" Hcream, cautions about dermal testosterone transfer to/ ^: n* h3 H$ L
unprotected females through direct skin exposure.2 t0 n$ [4 w1 K5 A G9 z
Serum testosterone level was found to be 2 times the
% F B" F0 L4 p5 `baseline value in those females who were exposed to
0 s' H1 [) c8 j1 M3 l2 [even 15 minutes of direct skin contact with their male
* U' l" N5 l# O5 i7 b" [partners.6 However, when a shirt covered the applica-; {1 p# W% Q6 b# n9 a
tion site, this testosterone transfer was prevented.
# N' o% s. ]* QOur patient’s testosterone level was 60 ng/mL,
% x5 v$ R" R0 g- s! E: K: Hwhich was clearly high. Some studies suggest that
- u% P5 u0 S' _dermal conversion of testosterone to dihydrotestos-% N$ G Q+ R3 [- D
terone, which is a more potent metabolite, is more
7 w6 Z7 c P1 f5 lactive in young children exposed to testosterone
2 Y8 U- S E9 u' S7 ^% P uexogenously7; however, we did not measure a dihy-) X" s" v9 G1 U
drotestosterone level in our patient. In addition to
+ _: |1 E8 X J. i: y$ ivirilization, exposure to exogenous testosterone in
( j3 l0 r9 g f; i9 K. fchildren results in an increase in growth velocity and1 v0 P" M) n3 M, O" H
advanced bone age, as seen in our patient.
7 B) y. `, z. l, o- d9 U; kThe long-term effect of androgen exposure during
* N" G# L3 ]$ r3 W7 a$ t! M$ U @early childhood on pubertal development and final
- D! S8 P, Z4 ~* M: B8 h* ^adult height are not fully known and always remain
+ s8 t2 M7 A) w) i/ z' |0 Ja concern. Children treated with short-term testos-) ]' v0 n# O% V/ @4 k- \9 p' y
terone injection or topical androgen may exhibit some
; r/ h6 a8 N6 i0 {, [8 @3 vacceleration of the skeletal maturation; however, after# c$ t, C1 a1 L, D8 j* H3 E7 g
cessation of treatment, the rate of bone maturation
1 A( I# [8 p H5 ]/ Ldecelerates and gradually returns to normal.8,9( b* }8 F/ ^8 {3 q
There are conflicting reports and controversy: N' U4 j: i1 H% u. k* m
over the effect of early androgen exposure on adult
& N# k! m4 V3 n$ D; \8 x) c* wpenile length.10,11 Some reports suggest subnormal
: g9 R% ]. m5 s/ I9 ~4 Aadult penile length, apparently because of downreg-
! E' T$ q3 ?/ L7 Hulation of androgen receptor number.10,12 However,& N2 w& X2 C$ t" r
Sutherland et al13 did not find a correlation between
6 Y% K$ V- f8 t1 d9 R' Ichildhood testosterone exposure and reduced adult
# \0 U1 M+ C6 A" T+ D' r7 N. wpenile length in clinical studies.) P [3 b- I7 ]
Nonetheless, we do not believe our patient is& c( t( M* r! p
going to experience any of the untoward effects from* y/ ~3 F, g0 e1 i! J
testosterone exposure as mentioned earlier because( w" \; T8 h) d, ~1 ?4 w
the exposure was not for a prolonged period of time.) K2 \; a7 V! i( h$ w1 q
Although the bone age was advanced at the time of) g, j1 }' q0 C4 D, Y6 K
diagnosis, the child had a normal growth velocity at
3 f5 P- }$ l: b2 ^the follow-up visit. It is hoped that his final adult# F1 T( D% z+ f% S
height will not be affected.' x# A4 v6 v) e: g" L% Z8 A
Although rarely reported, the widespread avail-( ?+ k' z7 \2 g
ability of androgen products in our society may6 Y3 A6 I2 K c: W: r
indeed cause more virilization in male or female* r6 ?+ L! d6 V3 R2 d8 E: a( S& ^
children than one would realize. Exposure to andro-
+ I- R6 m6 R; Ygen products must be considered and specific ques-$ D; `/ m3 w- G* t& A* m
tioning about the use of a testosterone product or
& `9 }( w+ } I1 s! J, Z mgel should be asked of the family members during6 P# S4 N3 ]; U$ u6 F
the evaluation of any children who present with vir-; m% K4 y d X2 I& _
ilization or peripheral precocious puberty. The diag-
# ?0 ?9 L% k# X7 t" Nnosis can be established by just a few tests and by
& n) E0 H3 O% R5 M+ M5 [5 \% ?2 Aappropriate history. The inability to obtain such a
P0 g- R; W6 {3 uhistory, or failure to ask the specific questions, may! R$ J) `8 a: R& F
result in extensive, unnecessary, and expensive
& b* l2 ]0 B- k% o8 linvestigation. The primary care physician should be
. |. S& [. m. ~1 b+ qaware of this fact, because most of these children
/ v2 @) B* k9 m& C! a! I9 Cmay initially present in their practice. The Physicians’
- F+ h- t# L7 j* EDesk Reference and package insert should also put a
5 ?. H/ e% B' {; }* Y3 Twarning about the virilizing effect on a male or; A! x+ X9 K6 ~4 _" s
female child who might come in contact with some-7 B! f% i# n. b% {7 L! t4 q, L$ v
one using any of these products.) b6 ]1 C- D( ?+ ^$ c5 H
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2 Q" |4 L. D' n, Z4 Z2002: 565-628.3 f' `1 n% Q' V2 ~7 o9 b
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exposure to testosterone. Pediatrics. 1999;104:e23.
3 `& F3 {0 ]9 W! [9 R: r5. Greulich WW, Pyle SI, eds. Radiographic Atlas of
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/ I/ l+ c: O& N5 Y! X6. Physicians’ Desk Reference. Androgel 1% testosterone,
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Economics Company, Inc; 2004:3239-3241.: R. F6 S( G) k9 N6 K; z
7. Klugo RC, Cerny JC. Response of micropenis to topical) r. a6 H3 ^ {1 i% k& K
testosterone and gonadotropin. J Urol. 1978;119:
5 E9 O8 o) ?+ p3 @0 V& H667-668.
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